JP2012205054A - Radio communication system, master unit, and slave unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve reliability and stability of signal transmission and reception in the case that a bidirectional radio channel is established between a fixed side and a moving side in a production line and the like.SOLUTION: A master unit 10 is disposed in a production line control unit in a fixed side while stopping transmitting a downlink radio wave and continually receiving an uplink radio wave in a stand-by state. A slave unit 12 is disposed in a work in a moving side while intermittently receiving a downlink radio wave and stopping transmitting an uplink radio wave in the stand-by state. The master unit 10 establishes a downlink radio channel and an uplink radio channel at different frequencies with the slave unit 12 if a communication start signal has been input from outside in the stand-by state. In addition, the slave unit 12 is provided with a vibration sensor 15 and when vibration is detected in the stand-by state, makes it possible to receive a communication start message from the master unit 10 switching from intermittent reception of a downlink radio wave to continuous reception. The master unit 10 transmits a communication end message to the slave unit 12 and releases establishment of the downlink radio channel and uplink radio channel if a communication end signal has been input.

Description

The present invention relates to a radio communication system, a master unit, and a slave unit that establish a bidirectional radio line between a fixed side and a mobile side to transmit and receive necessary information and signals.

  Conventionally, in the production facilities of various equipment and devices, a plurality of processes are divided in the order of work, the stations where necessary machines are installed for each process are arranged in order, and a transport mechanism is used for the plurality of stations. A line production system is employed in which work such as machining and assembly is performed while moving the workpieces in order.

  In such a line production system, when a workpiece is moved to a plurality of stations arranged in the order of processes using an appropriate transport mechanism, a workpiece stop position is determined in advance for each station, and the workpiece being moved is determined. Is detected to have reached a predetermined stop position, the transport mechanism is stopped, and a work is sent to the station to perform necessary process work.

In order to detect the stop position of the workpiece, usually, an appropriate sensor is installed on the station side which is a fixed facility, and the movement to the stop position of the workpiece is detected by the sensor and the transport mechanism is stopped.

JP-A-2005-182388 JP 2004-221277 A

  However, when detecting the stop position of a workpiece in such a conventional production facility, a sensor is installed on the fixed side of the station or the like, and a specific part of the workpiece enters the detection area of the sensor to reach the stop position. Since it has been detected, if the shape of the workpiece changes, the arrangement of the sensor for detecting the stop position must be changed and readjusted, and there is a problem that the degree of freedom of the production facility is low.

  In order to solve this problem, a sensor is mounted on the workpiece on the moving side, a member indicating the stop position is installed at the stop position of the station, and the position of the sensor is determined in advance even if the shape of the workpiece changes. It is possible to respond flexibly without changing the fixed equipment on the station side.

  However, when a sensor is installed on the moving work, it is necessary to use a signal line that can be expanded and contracted within the moving range of the work by the transport mechanism as a signal line for sending the signal from the sensor to the fixed control unit. Repeating may cause disconnection due to stress.

  For this reason, remote sensing is conceivable in which a detection signal from a sensor provided on a moving workpiece is wirelessly transmitted to a control unit on the fixed side. In other words, a base unit with a wireless transmission / reception function is installed in the control unit on the fixed side, a slave unit with a wireless transmission / reception function is placed on the work on the moving side, and necessary signals between the master unit and the slave unit Communicate.

  However, there are various noise sources at the production site, and the radio wave environment changes due to the movement of the work with the slave units moving. Depending on the radio wave communication status at that time, wireless communication may not be successful, Issues remain in terms of sex.

  Such problems are not limited to workpiece stop position detection, but when moving object types and conditions are monitored, production line routes are changed, moving objects are removed, and line stops are performed according to the moving object types and conditions. The same problem can be considered when transmitting and receiving signals and information.

  In addition, when radio waves are continuously transmitted from a battery-powered transmitter, there is a problem that the battery life is shortened and the frequency of maintenance of the transmitter is increased.

An object of the present invention is to provide a wireless communication system, a parent device, and a child device that improve the reliability and stability of signal transmission and reception when a wireless line is established between a fixed side and a mobile side.

(Wireless communication system)
The present invention is provided with a base unit provided with a radio transmission / reception unit arranged on the fixed side and a slave unit provided with a radio transmission / reception unit arranged on the moving side and operating with a battery power source, and between the master unit and the slave unit In a wireless communication system that establishes a two-way radio line consisting of a downlink radio line by transmission / reception of downlink radio waves and an uplink radio line by transmission / reception of uplink radio waves and communicates the state of the mobile side,
Set downstream and upstream radio waves to different frequencies,
The base unit is continuously receiving upstream radio waves in standby mode,
The cordless handset is intermittently receiving downlink radio waves in the standby state,
When the base unit receives a communication start signal from an external device in the standby state, it starts transmission of the downlink radio wave and sends a communication start message on the downlink radio wave to the slave unit.
When the slave unit receives a communication start message from the master unit, the slave unit switches from intermittent reception to continuous reception, and transmits the state of the moving side to the base unit and transmits it to the base unit.

The wireless communication system of the present invention further includes a vibration sensor that detects vibration on the moving side and outputs a vibration detection signal to the slave unit,
When detecting the input of the vibration detection signal from the vibration sensor in the standby state, the slave unit switches from intermittent reception to continuous reception and waits for reception of a communication start message.

  A state sensor that detects the state on the moving side and outputs a state detection signal to the slave unit is provided, and the slave unit transmits the state detection signal detected by the state sensor to the master unit in a state where a bidirectional wireless line is established. To process.

In the wireless communication system of the present invention,
When the base unit inputs a communication end signal from the outside during the establishment of a two-way radio line, it sends a communication end message on the downstream radio wave to the slave unit,
When the slave unit receives the communication end message from the master unit, the slave unit stops the transmission of the upstream radio wave and switches the continuous reception to the intermittent reception and shifts to the standby state.

  The slave unit and / or the master unit includes a display unit that displays the establishment of the wireless line.

  If the base unit does not receive the upstream radio wave from the slave unit even after a predetermined time has elapsed from the start of transmission of the downstream radio wave, it outputs a communication failure signal to the outside.

  If reception of the upstream radio wave is interrupted for a predetermined time during establishment of the upstream wireless line, the base unit shifts to a standby state.

  If the slave unit does not receive the communication end message even after a predetermined time has elapsed after receiving the communication start message, the slave unit shifts to a standby state.

(Base unit)
The present invention relates to a bidirectional radio channel composed of a downlink radio channel by transmission / reception of downlink radio waves and an uplink radio channel by transmission / reception of uplink radio waves to / from a mobile unit arranged on the fixed side and operating on a battery power source arranged on the mobile side In the base unit that establishes and communicates,
A transmission / reception unit configured to transmit / receive data to / from the slave unit by setting downstream and upstream radio waves to different frequencies;
When receiving an upstream signal continuously in the standby state and receiving a communication start signal from an external device in the standby state, a communication start message is transmitted on the downstream signal to the slave unit and the upstream signal from the slave unit is received. A base station control unit that establishes an uplink wireless line and communicates the state of the mobile side from the slave unit,
Is provided.

  Here, if the base unit controller does not receive the upstream radio wave from the slave unit even after a predetermined time has elapsed since the start of transmission of the downstream radio wave, it outputs a communication failure signal to the outside.

  The base unit control unit shifts to a standby state when reception of the upstream radio wave is interrupted for a predetermined time during establishment of the upstream wireless line.

(Cordless handset)
The present invention is arranged on a mobile side, and receives a signal from an external device and receives a signal from an external device, and communicates with a base station arranged on a fixed side. In a handset that operates with a battery power source that establishes a two-way wireless line consisting of a line and communicates the state of the mobile side,
A transmission / reception unit configured to transmit / receive data to / from the slave unit by setting downlink radio waves and uplink radio waves to different frequencies;
In the standby state, when the downlink radio wave is intermittently received and a communication start message is received from the base unit, the intermittent radio is switched to continuous reception to establish the downlink radio line and the transmission of the uplink radio wave is started and the uplink radio A slave unit control unit that establishes a line and communicates the status of the mobile side to the master unit;
Is provided.

The handset of the present invention further includes a vibration sensor on the moving side that detects vibration on the moving side and outputs a vibration detection signal to the handset,
When detecting the input of the vibration detection signal from the vibration sensor in the standby state, the slave unit controller switches from intermittent reception to continuous reception and waits for reception of a communication start message.

  When receiving a communication end message from the parent device while the two-way radio line is established, the child device control unit stops the transmission of the upstream radio wave and switches the continuous reception to the intermittent reception and shifts to the standby state.

If the slave unit control unit does not receive a communication end message even after a predetermined time has elapsed after receiving the communication start message, the slave unit control unit shifts to a standby state.

  According to the present invention, when control of a production facility or the like is started, a bidirectional radio channel composed of a downlink radio channel and an uplink radio channel between a master unit provided on the fixed side and a slave unit provided on the moving side Is established, and an instruction signal from the parent device and a signal detected by the state sensor on the child device side can be transmitted and received in substantially real time.

  Also, by separating the uplink and downlink radio frequencies established between the master and slave units, it is possible to ensure that even if uplink and downlink messages are transmitted in duplicate, no interference will occur. You can send and receive messages.

  In addition, the status of the upstream and downstream wireless links established between the base unit and the slave units is constantly monitored, and if radio wave reception is interrupted after a predetermined time, a communication failure is detected and a standby state is established. You can respond appropriately by returning to.

  Further, the slave unit is operated by a battery power source, and sufficient battery life can be ensured by performing intermittent reception in a standby state.

In addition, the slave unit receives the communication start message from the master unit and switches from intermittent reception to constant reception, but by detecting vibration associated with movement on the moving side by the vibration sensor and switching from intermittent reception to continuous reception, Before the communication start message is received from the master unit, the slave unit switches to continuous reception, and the communication start message from the master unit is quickly received without requiring the waiting time associated with intermittent reception. A line can be established.

Explanatory drawing which showed the example of the production equipment which provided the radio | wireless communications system by this invention The block diagram which showed embodiment of the function structure of the main | base station and the subunit | mobile_unit by this invention Time chart showing wireless communication processing according to this embodiment Flowchart showing the wireless communication process following FIG. Time chart showing wireless communication processing that detects movement on the moving side with a vibration sensor and switches the slave unit from intermittent transmission to continuous transmission Time chart showing processing when a communication failure occurs during line establishment Time chart showing processing when another communication failure occurs during line establishment Time chart showing processing when a communication failure occurs after establishing a line The flowchart which illustrated the main | base station control processing of FIG. The flowchart which illustrated the subunit | mobile_unit control process of FIG. Explanatory drawing which showed the other example of the production facility which provided the radio | wireless communications system by this invention Explanatory drawing which showed the other example of the production facility which provided the radio | wireless communications system by this invention

  FIG. 1 is an explanatory view showing an example of production equipment to which a wireless communication system according to the present invention is applied. In FIG. 1, the production facility includes a control unit 16, a driving unit 18, a transport mechanism 20, and stations 22 a to 22 c arranged in order with respect to the transport mechanism 20 according to the order of processes.

  The control unit 16 controls the drive unit 18, and the drive unit 18 transports the work 24 to be driven by the operation of the transport mechanism 20 from the station 22 a side to the station 22 b and the station 22 c in order, and performs necessary work at each station. Let it be done.

  The control unit 16 outputs a control start signal to the drive unit 18, moves the work 24 to a predetermined position determined by the stop position marker 26 a of the station 22 a by the transport mechanism 20, and then outputs a control end signal to the drive unit 18. Stop.

  The work 24 stopped at the position determined by the stop position marker 26a is subjected to necessary assembly work or the like at the station 22a. When the assembling work is completed, the control unit 16 moves the work 24 to a position determined by the stop position marker 26b provided in the next station 22b by the operation of the transport mechanism 20 based on the control with respect to the drive unit 18, and is necessary at the station 22b. Perform assembly work. Finally, the work 24 is moved to a position determined by the stop position marker 26c of the station 22c, and the assembly work by the station 22c is performed to complete a series of work steps.

  For such a production facility, as a wireless communication system according to the present invention, the master unit 10 is installed on the fixed control unit 16 side and connected to the signal line, while the slave unit 12 is connected to the work 24 side on the moving side. Is installed. Further, the work 24 includes a stop position sensor 14 that functions as a state sensor that detects arrival at the stop position markers 26a to 26c, and a vibration sensor 15 that detects vibration of the work 24 on the moving side and outputs a vibration detection signal. Is provided and is connected to the handset 12 for input.

  As the stop position sensor 14, an appropriate sensor such as a mechanical sensor switch or an optical light detection switch can be used. As the vibration sensor 15, for example, a sensor that detects a mechanical movement of a steel ball used in a pedometer (R) or a sensor that detects acceleration is used.

  The base unit 10 includes a wireless transmission / reception unit, and the slave unit 12 also includes a wireless transmission / reception unit. When starting the control, the control unit 16 outputs a control signal to the driving unit 18 and operates the transport mechanism 20 to start the movement of the workpiece 24. With this control start, the control unit 16 outputs a communication start signal to the parent device 10.

  When the base unit 10 detects the input of the communication start signal from the control unit 16, the base unit 10 establishes a bidirectional radio line composed of a downlink radio line and an uplink radio line having different frequencies with the slave unit 12, Maintain an established two-way radio link.

  The vibration sensor 15 detects the vibration generated when the driving unit 18 starts the movement of the work 24 by starting the control by the control unit 16 and outputs the vibration to the slave unit 12. Prior to reception of the communication start message from, the intermittent reception in the standby state of the slave unit 12 is switched to continuous reception, and thereafter the communication start message sent from the base unit 10 can be received quickly.

  If, for example, the stop position marker 26a is detected by the stop position sensor 14 while the two-way wireless line is established, a stop position detection message is transmitted from the slave unit 12 to the master unit 10 via the uplink wireless line. The base unit 10 that has received the stop position detection message outputs a stop position detection signal to the control unit 16, whereby the control unit 16 outputs a control end signal to the drive unit 18, stops the transport mechanism 20, The workpiece 24 is stopped at a position corresponding to the detected stop position marker 26a. Of course, after the establishment of the bidirectional wireless line, appropriate signal transmission / reception can be performed between the parent device 10 and the child device 12 as necessary.

  When the control for moving the workpiece 24 is completed, the control unit 16 outputs a communication end signal to the base unit 10, thereby releasing the bidirectional wireless line established during the control and returning to the standby state. .

  FIG. 2 is a block diagram showing an embodiment of the functional configuration of the master unit and the slave unit shown in FIG. In FIG. 2, the base unit 10 includes a base unit control unit 28 using a microprocessor, a transmission unit 30, a reception unit 32, an antenna 34, a memory 35, an operation unit 36, a display unit 38, an input / output unit 40, and an external unit. The power supply unit 42 is always supplied with commercial power.

  On the other hand, the slave unit 12 includes a slave unit control unit 44 using a microprocessor, a reception unit 46, a transmission unit 48, an antenna 50, a memory 51, an operation unit 52, a display unit 54, and a battery power source unit 56. A stop position sensor 14 and a vibration sensor 15 are input to the control unit 44.

  The transmission unit 30 and the reception unit 32 provided in the parent device 10 and the reception unit 46 and the transmission unit 48 provided in the child device 12 have a configuration compliant with, for example, a specific low-power radio station in Japan.

  In the present embodiment, the transmission unit 30 of the base unit 10 transmits a downstream radio wave having a downstream frequency f1 = 315 MHz, and the reception unit 46 of the slave unit 10 transmits a downstream radio wave having a downstream frequency f1 = 315 MHz transmitted from the base unit 10. Receive. This is the downlink radio line.

  On the other hand, the transmission unit 48 of the slave unit 12 transmits a radio wave with an uplink frequency f2 = 429 MHz, and the reception unit 32 of the master unit 10 receives a radio wave with an uplink frequency f2 = 429 MHz transmitted by the slave unit 12, and this is an uplink wireless line. It becomes.

  Thus, by setting the frequency of the downlink wireless line from the parent device 10 to the child device 12 to 315 MHz and the frequency of the uplink wireless line from the child device 12 to the parent device 10 being different from 429 MHz, the parent device 10 and the child device Thus, interference is prevented from occurring even if data is transmitted / received to / from 12 at the same time.

  The base unit 10 stops transmission of the transmission unit 30 in a standby state, and the reception unit 32 performs continuous reception. On the other hand, the slave unit 12 stops transmission of the transmission unit 48 in a standby state, and the reception unit 46 performs intermittent reception to suppress battery consumption by the battery power source 56.

  A signal can be input / output to / from the control unit 16 shown in FIG. When the base unit 10 receives a communication start signal from the control unit 16 via the input / output unit 40, the base unit 10 first performs an operation for establishing a bi-directional radio channel composed of a downlink radio channel and an uplink radio channel with the slave unit 12. Start.

  That is, when the base unit control unit 28 detects the input of the communication start signal, the base unit control unit 28 operates the transmission unit 30 to start transmission of a 315 MHz downlink radio wave, and then starts a communication start message based on the communication start signal input from the control unit 16. And is transmitted to the child device 12 on a 315 MHz downlink radio wave.

  The communication start message from the parent device 10 is received by the intermittent reception operation of the reception unit 46 of the child device 12, and the child device control unit 44 switches the reception unit 46 from intermittent reception to continuous reception based on the received communication start message. As a result, a downlink radio line for transmitting and receiving 315 MHz downlink radio waves is established between the transmission unit 30 of the base unit 10 and the reception unit 46 of the slave unit 12.

  Subsequently, the slave unit control unit 44 operates the transmission unit 48 to transmit a 429 MHz upstream radio wave to the base unit 10. The receiving unit 32 of the parent device 10 is in a continuous reception state, and when receiving a 429 MHz uplink radio wave from the child device 12, the parent device control unit 28 detects the establishment of the uplink wireless line from the child device 12.

  When the slave unit controller 44 switches the receiver unit 46 to continuous reception and the transmitter unit 48 transmits an uplink radio wave of 429 MHz, the slave unit controller 44 turns on the transmission LED provided in the display unit 54 and bidirectionally communicates with the master unit 10. Displays the communicable status due to the establishment of a wireless line.

  The slave unit control unit 44 stops transmission of the 429 MHz upstream radio wave in the standby state and intermittently receives the 315 MHz downstream radio wave. However, the vibration associated with the start of movement of the work 24 illustrated in FIG. 1 in the standby state. Is detected by the vibration sensor 15, the intermittent reception in the standby state is switched to the continuous reception.

  By switching from intermittent reception to continuous reception of the slave unit 12 based on the vibration detection of the vibration sensor 15, a communication start message transmitted from the master unit 10 with the start of control can be received at any time. Compared to receiving a communication start message from 10, the reception operation is performed quickly by switching to continuous reception in advance, and the time required for establishing a bidirectional wireless line between the parent device 10 and the child device 12 Can be shortened.

  When the base unit control unit 28 detects the reception of the 429 MHz uplink radio wave transmitted from the receiving unit 32 from the receiving unit 32, the base unit control unit 28 turns on the reception LED provided in the display unit 38, and the two-way wireless line between the base unit control unit 28 and the slave unit 12. Displays the communicable status due to establishment of.

  The base unit control unit 28 continues to receive the 429 MHz uplink radio wave from the slave unit 12 after the establishment of the bidirectional wireless line with the slave unit 12, and receives the uplink radio wave at a predetermined time of 429 MHz. When the communication is interrupted, a communication failure is detected, a communication failure signal is output to the control unit 16 via the input / output unit 40, and a transition to the standby state is received. Fault response control will be performed.

  After the establishment of the bidirectional wireless line between the master unit 10 and the slave unit 12, the slave unit control unit 44 reads the detection signal from the stop position sensor 14, and for example, the stop position shown in FIG. When the detection signal of the marker 26a is obtained, a stop position detection message is generated, and the stop position detection message is transmitted from the transmission unit 48 to the base unit 10 on the 429 MHz upstream radio wave.

  The master unit control unit 28 that has received the stop position detection message from the slave unit 12 outputs a stop position detection signal to the control unit 16 via the input / output unit 40. Perform control action.

  When a predetermined control operation is completed, a communication end signal is output from the control unit 16 to the base unit 10, and in response to this, the base unit control unit 28 generates a communication end message and places it on the 315 MHz downlink radio wave from the transmission unit 30. To the slave unit 12. The slave unit control unit 44 of the slave unit 12 that has received the communication end message from the base unit 10 switches the reception unit 46 from continuous reception to intermittent reception, stops transmission of 429 MHz upstream radio waves by the transmission unit 48, and is in a standby state Migrate to

  When the reception of the 429 MHz uplink radio wave from the slave unit 12 is interrupted due to the transition to the standby state, the master unit control unit 28 of the base unit 10 detects the end of communication and stops the transmission of the 315 MHz downlink radio wave by the transmission unit 30. And transition to the standby state.

  The operation unit 36 provided in the parent device 10 and the operation unit 52 provided in the child device 12 perform channel frequency selection used in the 315 MHz downlink radio channel and the 429 MHz uplink radio channel as an initial setting.

  Each of the parent device 10 and the child device 12 is assigned an address in advance, and can be set by using, for example, a dip switch provided in the operation unit 36. The address settings of the master unit 10 and the slave unit 12 may be stored in advance in the memories 35 and 51 as serial numbers and the like as addresses, without using the DIP switch of the operation unit 36.

  A message transmitted / received between the parent device 10 and the child device 12 includes a transmission source address, a transmission destination address, data or command, and a check code. For this reason, the memories 35 and 51 store the transmission destination address of the parent device 10 or the child device 12 as the transmission destination, and include it in the transmission message. The master unit control unit 28 and the slave unit control unit 44 detect a valid message reception when the destination address included in the received message matches the self address, and process based on the message data or command. Will do.

  Moreover, the transmission operation of the message | telegram by the transmission part 30 of the main | base station 10 and the transmission part 48 of the subunit | mobile_unit 12 performs the transmission operation | movement which transmits the same message | telegram data repeatedly several times over predetermined time, and from a transmission destination as needed. If an ACK message (acknowledgment response message) is received and no ACK message is received, the retransmission operation is repeated for a predetermined number of retries.

  Further, the base unit 10 transmits a regular notification message to the handset 12 at predetermined intervals. The slave unit 12 that has received the periodic notification message from the master unit 10 responds with the status of the slave unit at that time. That is, the slave unit 12 performs low-battery failure due to a voltage drop of the battery power source 56 and failure monitoring of each part in the background. When a failure is detected, the failure result is held in the memory 51 and the parent device 10 periodically reports If a failure is detected when the message is received, the failure information is included in the response message and transmitted.

  In response to this, when the base unit 10 detects a failure from the message, the base unit 10 recognizes the periodic abnormality report and outputs a periodic notification abnormality signal from the input / output unit 40 to the control unit 16 to perform necessary countermeasures. Become. In particular, the slave unit 12 is operated by the battery power source 56. When a low battery failure accompanying a decrease in the battery voltage is detected as a periodic notification abnormality, an alarm output for prompting the operator to replace the battery of the slave unit 12 is output. Will do.

  3 and 4 are time charts showing wireless communication processing in the wireless communication system of the present invention, and show basic processing when vibration detection by the vibration sensor 15 is not performed.

  In FIG. 3, base unit 10 is in a standby state in step S101, stops transmitting 315 MHz downlink radio waves, and continuously receives 429 MHz uplink radio waves. Further, the slave unit 12 is in a standby state in step S201, and transmission of the 429 MHz upstream radio wave is stopped, and reception of the 315 MHz downstream radio wave is intermittent reception.

  If the control unit 16 starts control in step S1 in such a standby state of the parent device 10 and the child device 12, a communication start signal is output to the parent device 10 in step S2. When the base unit 10 detects a communication start signal from the control unit 16, it starts transmission of a 315 MHz downlink radio wave in step S102, subsequently transmits a communication start message, and further starts a line establishment timer in step S103. In the circuit establishment timer, a predetermined time required for establishing a bidirectional wireless circuit is set as a timeout time. This communication start message also means that control is started and a request message that the state on the side of the slave unit 12 is returned by an uplink radio wave.

  When the slave unit 12 receives the communication start message from the master unit 10 in step S202, it switches intermittent reception to continuous reception in step S203, and then transmits a 429 MHz upstream radio wave in step S204, and turns on the transmission LED in step S205. Display the line establishment. In step S206, the transmission timer is started. As the set time of the transmission timer, a timeout time is set by adding a predetermined margin time to the time from the start of control by the control unit 16 to the end of control.

  When the base unit 10 receives the 429 MHz uplink radio wave from the slave unit 12 in step S104, the reception LED is turned on in step S105, and a line establishment display with the slave unit 12 is displayed.

  In this way, control is performed such that the work 24 is moved, for example, in a state where a bidirectional wireless line composed of a downlink wireless line and an uplink wireless line is established between the master unit 10 and the slave unit 12. When a predetermined stop position determined by the stop position marker 26a is reached, the stop position sensor 14 detects the stop position in step S301 and outputs a detection signal to the slave unit 12, and the slave unit 12 stops in step S207. A position detection message is transmitted to the parent device 10.

  When the master unit 10 receives the stop position detection message from the slave unit 12 in step S106, the master unit 10 outputs a stop position detection signal to the control unit 16, and the control unit 16 performs processing based on the stop position detection signal in step S3. The conveyance of 24 is stopped.

  Subsequently, proceeding to FIG. 4, the control unit 16 stops the control of the drive unit 18 in step S <b> 4, and then outputs a communication end signal to the parent device 10 in step S <b> 5. In response to this, the base unit 10 transmits a communication end message to the handset 12 in step S107. When receiving the communication end message in step S208, the slave unit 12 stops the transmission of the 429 MHz uplink radio wave in step S209, switches the continuous reception to the intermittent reception in step S210, and shifts to the standby state.

  When the base unit 10 detects in step S108 that reception of uplink radio waves from the slave unit 12 is stopped, the base unit 10 shifts to a standby state in step S109.

  FIG. 5 is a time chart showing wireless communication processing when vibration detection is performed by the vibration sensor 15 in the wireless communication system of the present invention. In the following time chart, blocks of steps different from the basic processing of FIGS. 3 and 4 are shaded.

  In FIG. 5, base unit 10 is in a standby state in step S101, stops transmitting 315 MHz downlink radio waves, and continuously receives 429 MHz uplink radio waves. Further, the slave unit 12 is in a standby state in step S201, and transmission of the 429 MHz upstream radio wave is stopped, and reception of the 315 MHz downstream radio wave is intermittent reception.

  When the control unit 16 starts control in step S <b> 1 in such a standby state, for example, the work 24 shown in FIG. 1 provided with the slave unit 12 and the vibration sensor 15 is moved by the operation of the transport mechanism 20 by the drive unit 18. Start. When the workpiece 24 starts moving, vibration is generated. When the vibration of the workpiece 24 is detected by the vibration sensor 15 in step S300, the slave unit 12 recognizes the start of control due to the start of movement of the workpiece 24 in step S200, and waits. The intermittent reception in the state is switched to continuous reception.

  By switching to the continuous reception in the slave unit 12, when the control starts, the base unit 10 can receive the communication start message transmitted in step S102 at any time, and the intermittent reception shown in FIG. Compared with the case where a communication start message is received, switching to continuous reception in advance enables the reception operation to be performed quickly and shortens the time required to establish a bidirectional wireless line between the parent device 10 and the child device 12. be able to.

  Note that the processing after step S102 of the parent device 10 and the processing after step S202 of the child device 12 in FIG. 5 are basically the same as those in FIG.

  FIG. 6 is a time chart showing processing when a communication failure occurs when a line is established between the parent device and the child device. In FIG. 6, the control unit 16 starts control in step S <b> 1, outputs a control start signal to the parent device 10 in step S <b> 2, and receives this, the parent device 10 moves from the standby state in step S <b> 101 to step S <b> 102, A communication start message is transmitted on a 315 MHz downlink radio wave.

  However, it is assumed that a communication failure 58 has occurred with the child device 12 and the communication start message on the 315 MHz downstream radio wave transmitted from the parent device 10 on the child device 12 side cannot be received. In this case, the handset 12 continues in the standby state in step S201, and transmission of an upward radio wave of 429 MHz is not performed.

  After transmitting a communication start message in step S102, base unit 10 starts a line establishment timer in step S103. In this case, since an uplink radio wave reception of 429 MHz cannot be obtained from the slave unit 12 due to the communication failure 58, the line establishment timer times out in step S110, thereby detecting the communication failure.

  For this reason, the main | base station 10 outputs a communication failure signal to the control part 16 by step S111, and transfers to a standby state by step S112. The control unit 16 that has received the communication failure signal from the parent device 10 performs communication failure processing such as urgently stopping the movement of the work 24 in step S6. In addition, after the movement of the work is stopped due to a communication failure, the control is resumed after a predetermined waiting time has elapsed and a control start signal is output to establish a bidirectional wireless line between the master unit 10 and the slave unit 12. After that, normal processing is performed.

  FIG. 7 is a time chart showing processing when another communication failure occurs at the time of establishing a line. In FIG. 7, in response to the transmission of the communication start message in step S102 of the parent device 10 based on the control start signal from the control unit 16, the communication start message is normally received in step S202 of the child device 12, The establishment of the downlink radio link has been successful.

  However, it is assumed that the communication failure 60 occurs when the upstream radio wave is transmitted in step S204, and the upstream radio wave cannot be received on the parent device 10 side. In this case, since the base unit 10 has started the line establishment timer in step S103 and no uplink radio wave is received from the slave unit 12, the line establishment timer times out in step S110, and the communication failure signal is controlled in step S111. 16 and shifts to a standby state in step S112.

  As described above, even when the establishment of the downlink radio channel is successful but the establishment of the uplink radio channel fails, the communication failure is detected in the same manner, and the control unit 16 performs a response process for the communication failure.

  FIG. 8 is a time chart showing processing when a wireless line is successfully established but a communication failure occurs after the wireless line is established. In FIG. 8, the processes in steps S101 to S105 of the parent device 10 and steps S201 to S206 of the child device 12 are the same as those shown in FIG. 3, and a 315 MHz downlink radio channel and a 429 MHz uplink radio channel between them. A two-way wireless line is established, and the stop position sensor 14 is waiting for detection of the work stop position.

  If the stop position sensor 14 detects a stop position in step S301 in this state, the slave unit 12 transmits a stop position detection message in step S207, and it is assumed that a communication failure 62 has occurred for this message transmission.

  Due to the occurrence of this communication failure 62, the base unit 10 starts receiving a timer that sets a predetermined radio wave blocking permissible time as a time-out period when reception of the 429 MHz upstream radio wave from the handset 12 is cut off. If time-out occurs in step S113, the process proceeds to step S114, a communication failure signal is output to the control unit 16, and the process shifts to a standby state in which transmission of 315 MHz downlink radio waves is stopped in step S115.

  The control unit 16 that has received the communication failure detection signal from the parent device 10 executes communication failure processing necessary in step S6. On the other hand, in the slave unit 12, a communication end message cannot be received from the master unit 10 even if the transmission timer started in step S206 elapses, so that a timeout occurs in step S213, and the process proceeds to step S214. Is stopped and the continuous reception of the 315 MHz downlink radio wave is returned to the intermittent reception to shift to the standby state.

  FIG. 9 is a flowchart illustrating a control process of base unit 10 of FIG. In FIG. 9, the main unit process performs initialization and self-diagnosis in step S1001 when power is turned on, and further performs various setting processes. If there is no abnormality due to self-diagnosis, the process proceeds to the standby state in step S1002, and the 315 MHz downlink Radio wave transmission is stopped and reception of 429 MHz uplink radio waves is continuous reception.

  Subsequently, when an input of a communication start signal from the control unit 16 is detected in step S1003, the process proceeds to step S1004 and transmission of a 315 MHz downlink radio wave is started, and at the same time, a communication start message is transmitted on the downlink radio wave.

  Subsequently, in step S1005, the presence / absence of reception of an upward radio wave of 429 MHz from the slave unit 12 is detected. If the reception of the upstream radio wave is not detected, in step S1006, the timeout of the line establishment timer started simultaneously with the start of transmission of the downstream radio wave. The presence or absence is detected. When the reception of the uplink radio wave is detected in step S1005, the process proceeds to step S1007, where the reception LED is turned on to display line establishment.

  Subsequently, in step S1008, the presence / absence of reception of the stop position detection message from the slave unit 12 is detected. If no message is detected, the presence / absence of blocking of the upstream radio wave is detected in step S1009. If blockage is detected, it is detected whether or not the reception timing has timed out in step S1010. If the reception timer times out, the process proceeds to step S1015, and a communication failure signal is output to the control unit 16 and the process proceeds to step S1002. Return to standby.

  When the reception of the stop position detection message is normally detected in step S1008, a stop position detection signal is output to the control unit 16 in step S1011. Subsequently, in step S1012, the presence or absence of a communication end signal input from the control unit 16 is detected. When the input of the communication end signal is detected, the process proceeds to step S1013, and a communication end message is transmitted to the slave unit 12. Subsequently, in step S1014, it is detected whether or not reception of the upstream radio wave from the slave unit 12 is stopped. When the reception stop is detected, the process returns to the standby state in step S1002.

  FIG. 10 is a flowchart illustrating the control process of the slave unit 12 of FIG. In FIG. 10, when the battery power of the slave unit 12 is turned on, initialization and self-diagnosis are performed in step S2001, and various settings are made. If there is no error as a result of self-diagnosis, the process proceeds to a standby state in step S2002. In this case, transmission of 429 MHz upstream radio waves is stopped, and reception of 315 MHz downstream radio waves is intermittent reception.

  Subsequently, in step S2003, the presence / absence of reception of the communication start message from the base unit 10 is detected. When the message reception is detected, the process proceeds to step S2004, and intermittent reception of the 315 MHz downlink radio wave is switched to continuous reception, and then step S2005. In step S2006, the transmission LED is turned on to display the establishment of a wireless line. Note that the transmission timer is started when the transmission of the uplink radio wave is started in step S2004.

  On the other hand, if no communication start message reception is detected in step S2003, it is determined in step S2007 whether or not vibration is detected by the vibration sensor 15. If it is determined in step S2007 that vibration detection associated with workpiece movement is detected, the process proceeds to step S2008, where intermittent reception of 315 MHz downlink radio waves is switched to continuous reception, and then in step S2009, reception of a communication start message from the base unit 10 is detected. Proceeding to step S2005, after transmitting an uplink radio wave of 429 MHz, in step S2006, the transmission LED is turned on to display the establishment of a wireless line.

  In step S2010, the presence or absence of stop position detection by the stop position sensor 14 of the workpiece 24 on the moving side is detected. If the stop position is not detected and the transmission timer times out in step S2011, step S2002 is performed. Return to the standby state, stop transmission and return to intermittent reception.

  If stop position detection by the stop position sensor 14 is detected before the transmission timer times out in step S2011, the process proceeds to step S2012, and a stop position detection message is transmitted to the parent device 10. Subsequently, in step S2013, the presence / absence of reception of a communication end message from the base unit 10 is detected. If communication end message reception is detected, the process proceeds to step S2014 to stop transmission of uplink radio waves and enter the standby state of step S2002. Return.

  FIG. 11 is an explanatory view showing another example of production equipment to which the wireless communication system according to the present invention is applied. In FIG. 11, the production facility includes a monitoring control device 100, a production line 102, and a storage unit 104. The production line 102 becomes a finished product through work by equipment and workers arranged along the line while moving a predetermined product 106, and is sent to the storage unit 104 for storage.

  In such a production facility, when working on the production line 102 and when the work is completed and sent to the storage unit 104, a specific parameter in the product 106, for example, an internal temperature rise or the like is monitored and abnormal When an internal temperature rise is observed, it may be necessary to deal with a defective product.

  Therefore, in the wireless communication system of the present invention, the master unit 10 is arranged on the monitoring control device 100 side of the production line 102, the slave unit 12 is arranged on the product 106, and the state sensor that detects the state of the product 106 is detected. For example, a temperature sensor 108 for measuring the internal temperature of the product 106 and a vibration sensor 15 similar to FIG. 2 for detecting the movement of the product are provided and connected to the slave unit 12.

  The details of the master unit 10 and the slave unit 12 are basically the same as those in the embodiment of FIG. 2 except that a temperature sensor 108 for detecting the internal temperature of the product is input to the slave unit 12 as a state sensor. Accordingly, when the two-way wireless line is established with the master unit 12, the slave unit control unit 44 transmits a temperature detection message based on the temperature detection signal of the temperature sensor 108 to the master unit 10. Become. Further, the switching control from intermittent reception to continuous reception of the slave unit 12 when the product 106 is moved on the line by the vibration sensor 15 is the same as in FIG.

  The wireless communication process between the parent device and the child device in the wireless communication system of FIG. 11 is basically the same as the time charts shown in FIGS. That is, the monitoring and control apparatus 100 outputs a communication start signal to the parent device 10 every predetermined cycle, and a bidirectional wireless line is established between the parent device 10 and the child device 12.

  When the bidirectional wireless line is established in this way, the slave unit 12 generates a temperature detection message based on the temperature detection signal of the temperature sensor 108 and transmits it to the master unit 10, and the master unit 10 sends the temperature detection message to the monitoring control device 100. A detection signal is output. The monitoring and control apparatus 100 monitors the detected temperature based on the temperature detection signal output from the master unit 10 and outputs an abnormal alarm when a temperature increase exceeding a predetermined threshold temperature is determined, and the presence of a product whose internal temperature has increased. And a countermeasure such as removing the defective product from the production line 102 or the storage unit 104 is performed.

  When the product 106 is moving on the production line 102, a signal line is established by detecting the movement of the vibration sensor 15, and the product 106 such as stop position detection and temperature information in the example of FIG. By transmitting the status information on the production line from the slave unit 12 to the master unit 10, the status of the product 106 can be monitored. Depending on the transmitted information, for example, the production line is stopped or an alarm is given.

  The slave unit 12 is provided with a threshold temperature of the temperature sensor 108, and when the detected temperature exceeds a predetermined threshold temperature, the slave unit 12 switches from intermittent reception to continuous reception and transmits upstream radio waves to the master unit 10. May be started.

  A specific example of monitoring the state of the product during and after production is a lithium battery production line. In the lithium battery production line, it is necessary to check the temperature rise and voltage status of the battery body after charging the electrolyte into the battery body. If there is an abnormality in each parameter, it is necessary to deal with it in a separate process. As shown in FIG. 11, the wireless communication system according to the present invention can be applied to such lithium battery parameter monitoring.

  Therefore, after the electrolyte is put into the battery body, a temperature sensor or a voltage sensor is provided as a state sensor and connected to the slave unit 12, and a bidirectional wireless line is established with the master unit 10 to establish a temperature detection message or voltage. A detection message is transmitted to the base unit 10 and output to the monitoring control device 200. If it is normal, it is regarded as a finished product. If it is abnormal, repair work such as replacement of electrolyte or replacement of electrodes is performed. Remove as good.

  As another example of monitoring the state of the product in the production line, there is a production line in which a product such as a device on which an electrical component is mounted is sealed with an epoxy resin. When the product is filled with an epoxy resin, it is necessary to monitor that the curing of the epoxy resin is proceeding smoothly. Such determination of the curing of the epoxy resin uses the measured values of reaction temperature and hardness as parameters.

  Therefore, a temperature sensor or hardness sensor is provided as a state sensor on the product sealed with epoxy resin and connected to the slave unit 12, and a bidirectional wireless line is established between the master unit 10 and a temperature detection message or hardness detection. An electronic message is transmitted to the main unit 10 and further output to the monitoring control device 10 to monitor whether or not the epoxy resin is cured smoothly. If an abnormality is determined, the line is stopped or repaired, and cannot be repaired. If so, remove it as a defective product.

  FIG. 12 is an explanatory view showing a plan view of another example of production equipment to which the wireless communication system according to the present invention is applied. In FIG. 12, the production facility includes a monitoring control device 200, a production line 202, a branch unit 204, and branch production lines 206 and 208. The production line 202 is assembled through the operation of equipment and workers arranged along the line while moving a predetermined product 210 to become, for example, a semi-finished product, which is sent to the branching unit 204, depending on the state of the product 210. Then, the product is branched to one of the branch lines 206 and 208, and becomes a finished product through work performed by equipment and workers arranged along the branch lines 206 and 208.

The monitoring control device 200 monitors the state of the product 210 as a semi-finished product by the production line 202, for example, the internal temperature. If the internal temperature is abnormal, the process branches to the branch production line 208 to resolve the internal temperature abnormality and complete the product. If the internal temperature abnormality is If it is not resolved, remove it as a defective product.
In such a production facility, it is necessary to monitor specific parameters in the product 210 such as an internal temperature in the production line 202.

  Therefore, in the wireless communication system of the present invention, the master unit 10 is disposed on the monitoring control device 200 side that performs branch control of the branch unit 204, and the slave unit 12 is disposed on the product 210 that moves on the production line 202. As a state sensor for detecting the state of the product 210, for example, a temperature sensor 212 for measuring the internal temperature of the product 210 is provided and connected to the slave unit 12.

  Details of the master unit 10 and the slave unit 12 are basically the same as those in the embodiment of FIG. 2, but a temperature sensor 212 that detects the internal temperature of the product 210 is connected to the slave unit 12 as a state sensor. Accordingly, the slave unit control unit 44 transmits a temperature detection message based on the temperature detection signal of the temperature sensor 212 to the master unit 10 when a two-way wireless link is established with the master unit 12.

  The wireless communication processing between the parent device and the child device in the wireless communication system of FIG. 12 is basically the same as the time charts shown in FIGS. That is, when the monitoring and control apparatus 200 recognizes that the product 210 has progressed through the production line 202 to become a semi-finished product and has moved to a predetermined position before the branching unit 204, it outputs a communication start signal to the master unit 10, A bidirectional wireless line is established between the parent device 10 and the child device 12.

  When the bidirectional wireless line is established in this way, the slave unit 12 generates a temperature detection message based on the temperature detection signal of the temperature sensor 212 and transmits it to the master unit 10, and the master unit 10 sends the temperature to the monitoring control device 200. A detection signal is output. The monitoring and control device 200 monitors the detected temperature based on the temperature detection signal output from the master unit 10. For example, if the temperature is equal to or lower than a predetermined threshold temperature, the monitoring controller 200 determines that the product is normal and branches the product 210 to the branch production line 206. On the other hand, if a temperature rise exceeding a predetermined threshold temperature is determined, it is determined that the temperature is abnormal, and the product 210 is branched to the branch production line 208.

  The other item to be monitored during production may be the weight of the product 210. If the weight is within the specified weight range in the production process stage, the process branches to the branch production line 206 to reach the finished product. Is out of the specified weight range at the process stage, it is branched to the branch production line 208 as an assembly error and removed as a defective product.

  A specific example of a production facility that monitors the state of the product in the middle of production and changes the subsequent production process according to the state of the product is the above-described lithium battery production line. In a lithium battery production line, it is necessary to check the temperature rise and voltage state of the battery body after charging the electrolyte into the battery body. If there is an abnormality in each parameter, it is necessary to deal with it in a separate process.

  Therefore, after the electrolytic solution is introduced into the battery body in the production line 202, the temperature and voltage are detected by the temperature sensor and the voltage sensor connected to the slave unit 12, and the temperature and voltage are sent to the master unit 10 to be monitored by the monitoring control device 200. The voltage state is monitored, and if it is normal, it branches to the branch production line 206 to be a finished product, and if it is abnormal, it branches to the branch production line 208 having a repair process such as replacement of the electrolysis solution or replacement of the electrodes.

  Further, as another example of branching by monitoring the state of the product in the production line of FIG. 12, the present invention can also be applied to a production line in which a product such as a device mounted with the above-described electrical components is sealed with an epoxy resin.

  In other words, when the product is filled with epoxy resin in the production line 202, a temperature sensor and a hardness sensor are provided on the product to monitor the progress of curing of the oxy resin, and the input is connected to the slave unit 12. Then, the monitoring and control device 200 recognizes that it has moved to a predetermined position before the branching unit 204, establishes a wireless communication line between the parent device 10 and the child device 12, and transmits a temperature detection message and a hardness detection message. The temperature detection signal and the hardness detection signal are output to the monitoring and control device 10 to monitor whether or not the epoxy resin is cured smoothly. If it is normal, it branches to the branch production line 206. If it is abnormal, it branches to the branch production line 208 and is repaired by refilling with epoxy resin or the like. If it cannot be repaired, it is rejected as a defective product.

  In addition, as the production equipment for detecting the state of the product shown in FIG. 12 and branching the production line, there are production equipment for producing a mixture of products of different models on the same production line, and a flexible production equipment for a small variety of products. Yes, in such a production facility, when a branch production line is provided for a process unique to a specific model and the branch or bypass is made, the master unit 10 is arranged on the control device side, and the model information etc. is in the product. By providing a slave unit 12 with a sensor, a bidirectional wireless line is established between the master unit 10 and the slave unit 12 at a necessary timing, and a state detection message such as the product model and temperature is transmitted to the product. Perform branch control. The establishment timing of this communication is provided with a vibration sensor 15 similar to that shown in FIG. 2 provided in the slave unit 12, and when movement is detected, the model information and other monitoring information are communicated to the master unit side to branch the production line. It can be carried out.

  In addition, although said embodiment has taken the workpiece | work 24 as a product moved via the conveyance mechanism 20 by the drive part 18 as a movement side as shown in FIG. It may be a carriage on which the work 24 is mounted, a mobile conveyance vehicle that moves on a line, or the like.

  The application of the wireless communication system of the present invention is not limited to the production facility shown in FIG. 1, and can be applied to an appropriate object having a fixed-side and moving-side arrangement or apparatus.

  In addition to the detection signal from the sensor from the slave unit, an appropriate signal can be transmitted and received as necessary for signals transmitted and received in a state where a bidirectional wireless line is established between the master unit and the slave unit.

  In the above embodiment, the case where a master unit and a slave unit are provided is taken as an example. However, when monitoring the status of a plurality of products, downlink radio waves and slave units transmitted from the master unit are used. A plurality of frequency channels may be prepared for uplink radio waves transmitted from the machine, and a frequency division multiplexing system may be assigned to each pair of the parent machine and the child machine. In this case, the base unit side has a common base unit control unit, and a transmission circuit and a reception circuit are provided for a plurality of frequency channels, so that a single base unit can correspond to a plurality of slave units. it can.

  In the wireless communication system of the present embodiment, a bidirectional wireless line composed of a downlink wireless line and an uplink wireless line having different frequencies is established between the master unit and the slave unit, and input connection is made to the slave unit. The detection signal of the status sensor is sent to the main unit in real time and output to the control unit side. However, after detection by the status sensor, it is sent from the slave unit to the main unit via the wireless line, and further to the control unit Since a predetermined transmission time is required until the data is output, in the real-time control by the control unit, it is necessary to perform a control process in consideration of this transmission time delay, and at the same time, there is a transmission delay. Even if it exists, it is necessary to apply the radio | wireless communications system of this embodiment to the control which can fully respond. The same applies to the case where an appropriate sensor is provided on the slave unit side and the detection signal is transmitted to the master unit side.

Further, the present invention includes appropriate modifications that do not impair the object and advantages thereof, and is not limited by the numerical values shown in the above embodiments.

10: Master device 12: Slave device 14: Stop position sensor 15: Vibration sensor 16: Control unit 18: Drive unit 20: Transport mechanisms 22a to 22c: Station 24: Workpiece (moving side)
26a to 26c: Stop position marker 28: Base unit control unit 30, 48: Transmission unit 32, 46: Reception unit 34, 50: Antenna 36, 52: Operation unit 38, 54: Display unit 40: Input / output unit 42: Power supply Unit 44: Remote control unit 56: Battery power source 202, 206, 208: Production line

Claims (15)

A base unit provided with a radio transmission / reception unit arranged on the fixed side and a slave unit provided with a radio transmission / reception unit arranged on the movement side and operated by a battery power source are provided. In a wireless communication system for establishing a two-way radio line composed of a downlink radio line by transmission / reception of radio waves and an uplink radio line by transmission / reception of uplink radio waves and communicating the state of the mobile side,
Set the downstream and upstream radio waves to different frequencies,
The base unit continuously receives the upstream radio wave in a standby state,
The handset is intermittently receiving the downlink radio wave in a standby state,
When the base unit receives a communication start signal from the external device in the standby state, it starts transmission of the downlink radio wave and transmits a communication start message on the downlink radio wave to the slave unit,
When the slave unit receives the communication start message from the master unit, the slave unit switches the intermittent reception to continuous reception and transmits the state of the moving side to the uplink radio wave and transmits it to the master unit. Wireless communication system.
The wireless communication system according to claim 1, wherein
A vibration sensor that detects vibration on the moving side and outputs a vibration detection signal to the slave unit is provided,
When the slave unit detects an input of a vibration detection signal from the vibration sensor in the standby state, the slave unit switches the intermittent reception to continuous reception and waits for reception of the communication start message.
The wireless communication system according to claim 1, wherein
A state sensor that detects the state on the moving side and outputs a state detection signal to the slave unit is provided,
The wireless communication system, wherein the slave unit transmits a state detection signal detected by the state sensor to the master unit for processing in a state where the bidirectional wireless line is established.
The wireless communication system according to claim 1, wherein
When the base unit inputs a communication end signal from the outside during the establishment of the bidirectional wireless line, the base unit transmits a communication end message on the downlink radio wave to the slave unit,
When the slave unit receives the communication end message from the master unit, the slave unit stops transmission of the uplink radio wave, switches the continuous reception to intermittent reception, and shifts to the standby state. .
2. The wireless communication system according to claim 1, further comprising a display unit for displaying establishment of a wireless line on the slave unit and / or the master unit.
2. The radio communication system according to claim 1, wherein the master unit outputs a communication failure if it does not receive the uplink radio wave from the slave unit even after a predetermined time has elapsed since the start of transmission of the downlink radio wave. Wireless communication system.
2. The wireless communication system according to claim 1, wherein the base unit shifts to a standby state when reception of the upstream radio wave is interrupted for a predetermined time during establishment of the upstream wireless channel. Wireless communication system.
2. The wireless communication system according to claim 1, wherein, when the slave unit does not receive the communication end message even after a predetermined time has elapsed after receiving the communication start message, the slave unit shifts to the standby state. A wireless communication system.
Establish a two-way radio line consisting of a downlink radio line by transmission / reception of downlink radio waves and an uplink radio line by transmission / reception of uplink radio waves with a slave unit that is arranged on the fixed side and operates on a battery power source arranged on the mobile side In the base unit that communicates the state of the mobile side,
A transmission / reception unit configured to transmit / receive data to / from the slave unit by setting the downlink radio wave and the uplink radio wave to different frequencies;
When receiving an upstream radio wave continuously in a standby state and receiving a communication start signal from an external device in the standby state, a communication start message is transmitted to the slave unit on the downstream radio wave, and from the slave unit A master unit control unit for receiving the uplink radio wave to establish the uplink radio line and communicating a mobile-side state from the slave unit;
A master unit for remote monitoring characterized by the provision of
10. The base unit according to claim 9, wherein the base unit control unit outputs a communication failure signal to the outside when no upstream radio wave is received from the slave unit even after a predetermined time has elapsed from the start of transmission of the downstream radio wave. A master unit characterized by that.
The base unit according to claim 9, wherein the base unit control unit shifts to the standby state when reception of the upstream radio wave is interrupted for a predetermined time during the establishment of the upstream wireless channel. Master machine to do.
Both a downlink radio channel that transmits and receives downlink radio waves and an uplink radio channel that transmits and receives uplink radio waves to and from a base unit that is arranged on the fixed side that receives signals from external devices and communicates on the mobile side In the cordless handset that operates with the battery power source that establishes the direction wireless line and communicates the state of the mobile side,
A transmission / reception unit configured to transmit / receive data to / from the slave unit by setting the downlink radio wave and the uplink radio wave to different frequencies;
When the downlink radio wave is intermittently received in a standby state and a communication start message is received from the base unit, the intermittent reception is switched to continuous reception to establish the downlink radio line and transmit the uplink radio wave. A slave unit control unit that starts and establishes the uplink wireless line, and communicates the state of the mobile side to the master unit;
A handset characterized by providing
In the subunit | mobile_unit of Claim 12,
A vibration sensor that detects vibration on the moving side and outputs a vibration detection signal to the slave unit is provided on the moving side,
The slave unit control unit, when detecting input of a vibration detection signal from the vibration sensor in the standby state, switches the intermittent reception to continuous reception and waits for the downlink radio wave.
13. The slave unit according to claim 12, wherein the slave unit control unit stops transmission of the uplink radio wave when receiving a communication end message from the master unit during establishment of the bidirectional wireless line. A slave unit that switches from continuous reception to intermittent reception and shifts to the standby state.
  13. The slave unit according to claim 12, wherein the slave unit control unit shifts to the standby state when the communication end message is not received even after a predetermined time has elapsed after receiving the communication start message. A handset characterized by

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