JPH0118637B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides information exchange between the main control unit and a plurality of controlled units based on the control of a main control unit equipped with a processor such as a microprocessor. This invention relates to a method for resetting a controlled unit for a complex system in which the controlled unit performs a predetermined operation.

Such complex systems have recently been used in various control devices and communication terminal devices, and one example is the "Button Telephone Exchange System" (Japanese Patent Application No. 83485/1983) filed separately by the present applicant.
can be mentioned.

That is, FIG. 1 is a block diagram showing the entire configuration of the "key telephone exchange system", in which central lines SL ₁ to _{SL n} from the central office are connected to central line units SLU ₁ to _{SLU n.}
The audio signals are separated and applied in parallel to each terminal unit TEU ₁ to TEU _o , via cross points using analog switch circuits in the terminal units TEU ₁ to TEU _o . Exchange connections are made with a plurality of telephones MFT ₁ to MFT _o .

Furthermore, link circuits L ₁ to _{L p} are provided between the terminal units TEU ₁ to TEU _o , and exchange connections between the telephones MFT ₁ to MFT _o are also possible via the aforementioned cross points. .

In addition, the terminal units TEU ₁ to TEU _o and the telephone
MFT ₁ to MFT _o are connected to each other by a four-wire line consisting of voice lines VL ₁ to VL _o and data lines DL ₁ to _{DL o} , and terminal units TEU ₁ to TEU _o.
Voice signals and FS signals (frequency shift signals) are transmitted through the line transformers installed in the telephones MFT ₁ to MFT _o .
At the same time, data signals are sent and received by the terminal unit via the neutral point provided in the line transformer of the voice lines VL ₁ to _{VL o} and the data lines DL ₁ to _{DL o} .
Power is supplied from TEU ₁ to TEU _o to the telephones MFT ₁ to MFT _o .

In addition, the main control unit MCU, central office line units SLU ₁ to SLU _n , and terminal unit TEU ₁
~ TEU _o is equipped with a processor such as a microprocessor, and the processor of terminal unit TEU ₁ ~ TEU _o decodes and retains the transmission information etc. from the telephone MFT ₁ ~ MFT _o , and the main control unit MCU It decodes and retains the incoming information etc. given from the unit, and according to instructions from the unit MCU,
Incoming call information etc. are sent to the telephones MFT ₁ to MFT _o , while outgoing information etc. are sent to the main control unit MCU.
Checks the outgoing information from the terminal units TEU ₁ to TEU _o and the incoming information from the central office line units SLU ₁ to _{SLU n} , and then checks the outgoing/receiving control unit OAD.
After checking the setting information, command information based on this information is sent to the central office line units SLU ₁ to _{SLU n} and terminal units TEU ₁ to TEU _o , thereby controlling the exchange operation of the entire system.

On the other hand, the telephones MFT ₁ to _{MFT o} are equipped with the required number of non-locking button switches and indicator lights, as well as a dial for oscillating the central office line, as well as a telephone circuit and a buzzer or bell for notifying an incoming call, and further, It has a processor and a MODEM (modulator/demodulator), and the processor decodes information generated by button switch operations and dial information from dial operations, controls the MODEM, and sends it out as a data signal, while the terminal unit TEU ₁
- The data signal from the MODEM also provided in the TEU _o is received by its own MODEM, and the received output is decoded by the processor to turn on the indicator light, ring the buzzer or bell, etc.

Figure 2 is a block diagram of the central office line units SLU ₁ to _{SLU n} , in which a signal detection circuit DET using a diode bridge circuit and a photo coupler detects a paging signal, and this is sent to the processor CPUs as arrival/departure information. and the processor
The relay HS operates under the control of the CPUs, and when its contact _hs turns on, a loop circuit is formed via the primary winding of the line transformer _LTs .
At the same time, the relay HS operates and recovers according to the control of the processor CPUs, turning the contact h _s on and off,
It is also designed to send out dial pulses.

Figure 3 is a block diagram of the terminal units TEU ₁ to TEU _o , and the voice line VL from the telephone MFT.
is the station line SL ₁ which passes through the station line units SLU ₁ to _{SLU n} via the line transformer LT _v and the cross point CP.
~SL _n or link circuit L ₁ ~L _p is connected,
The crosspoint CP is turned on under control from the main control unit MCU, thereby establishing a predetermined exchange connection.

In addition, the data line DL from the telephone MFT is connected to the MODEM/MDM via the line transformer LTd, and according to the control of the processor CPU _t ,
While the MODEM/MDM sends a data signal as an FS signal using audio frequencies, the MODEM/MDM demodulates the FS signal from the telephone MFT into a data signal and provides it to the processor CPU _t .

Figure 4 shows the main control unit MCU and the central office line unit SLU _{1 to SLU 1} based on the control of the main control unit MCU.
This is a time chart showing information exchange operations between SLU _n and terminal units TEU ₁ to TEU _o , as well as information exchange operations between the same units TEU ₁ to TEU _o and telephones MFT ₁ to MFT _o . First, each unit SLU ₁ to
If there is no incoming/outgoing information on SLU _n and TEU ₁ to TEU _o , even if a "check start" is performed by sending a boring signal from the main control unit MCU, there will be no information retained on either side, so polling will be performed sequentially. Signals are transmitted from each unit SLU ₁ to SLU _n , TEU ₁ to
The check ends only when the data is sent to TEU _o , and at the end of the check, the terminal unit TEU ₁ ~
A "TEU transmission start" command is given to TEU _o from the main control unit MCU, and as a result, all terminal units TEU ₁ to TEU _o simultaneously transmit data signals to telephones MFT ₁ to MFT _o .

When this data signal transmission is completed, data signals are transmitted from the telephones MFT ₁ to MFT _o all at once, and if there is any information, that information is held in the terminal units TEU ₁ to _{TEU o.} be done.

When the data signal transmission from the telephones MFT ₁ to MFT _o ends with "MFT transmission end", the main control unit MCU again performs "check start", but if any "incoming call" from central office line SL ₁ has been received since the previous check time, If " is present, this outgoing information is given from the central office line unit SLU ₁ , so the incoming information is immediately sent sequentially to the terminal units TEU ₁ to TEU _o , and is held in each unit TEU ₁ to TEU _o .

Next, check the central line unit SLU ₂ , and if there is no information, check the central line unit SLU _n in sequence.
After checking the above, the terminal unit TEU ₁ is checked, and if an outgoing call has been made since the previous check, this is detected at the terminal unit TEU ₁ by the data signal sent from the telephone MFT ₁ in the previous check cycle. Therefore, if this information is "local line origination", information to that effect is given to each central line unit SLU ₁ to SLU _n and held, and each terminal unit TEU ₁ to
This information is also given to TEU _o , and terminal unit TEU ₁
The terminal unit sends a response confirming the outgoing call.
For TEU ₂ and later, a command to display that the telephone MFT ₁ is busy is maintained.

Additionally, if telephone MFT ₂ has been making an "extension call" since the last check, this information is given only to each terminal unit TEU ₁ to TEU _o , and telephone MFT ₂ also displays a busy message. The command to do so is retained.

As described above, when the generation of information is confirmed, the main control unit MCU exchanges the necessary information each time, and also sends and receives the necessary information to other terminal units TEU ₃ to TEU _o.
Then, by "start TEU transmission" again, the terminal units TEU ₁ to TEU _o transmit data signals indicating each information, and the telephones MFT ₁ to MFT _o also transmit data signals again. .

As a result, each of the telephones MET ₁ to MFT _o displays an incoming call from the central office line SL ₁ , and at the same time, the telephones MFT ₁ and MFT ₂ display that they are in the outgoing state. and for other telephones MFT ₃ to MFT _o , telephones MFT ₁ to
A message will appear indicating that MFT ₂ is now busy.

Note that information such as dialing, call termination, etc. from each of the telephones MFT ₁ to MFT _o is similarly given to each terminal unit TEU ₁ to TEU _o by sending data signals.

Therefore, the main control unit is responsible for sending and receiving information.
All data is transferred between the MCU and the central office line units SLU ₁ to _{SLU n} and the terminal units TEU ₁ to TEU _o , and then transferred all at once to the telephones MFT ₁ to MFT _o .
Since information from telephones MFT ₁ to MFT _o is also sent at the same time, central office lines SL ₁ to SL _n and telephones MFT ₁ to
The total time required is significantly reduced compared to checking information on each MFT _o and sending and receiving information each time.

In other words, there are 4 central office line SL lines and 12 telephone MFT lines.
If a 4-bit line is used for each processor CPU and the clock pulse frequency is 2MHz, the instruction execution speed is approximately 300 steps/1 msec, so information is generated and information is exchanged accordingly. However, the time required for each central office line unit SLU or terminal unit TEU is approximately 1 msec, and the time required from "start of check" to "start of TEU transmission" is approximately 16 msec at maximum, and the data signal transmission speed is 800 bits. /sec, and assuming that one word of the data signal consists of 11 bits, it will take approximately 14 msec from "start of TEU transmission" to the end of data signal transmission to the telephone MFT.
Therefore, the time required for data signal transmission in the opposite direction is the same, so the maximum time required from "start of check" to start of the next "check" is about 40 to 50 msec, and there is no perceived delay at all in the operation of the telephone MFT. Become.

FIG. 5 is a flowchart showing the operating status of the main control unit MCU to execute the above information exchange and various controls.
Fixed memory ROM (Read
Based on the instructions stored in the built-in variable memory RAM (Random
Control processing is executed while data is being accumulated in the Access Memory.

First, after "initial state setting", the central office line unit "SLU" is selected to check and analyze the central office line information, and if "processing required" is YES, "all TEUs are selected one after another". If the question ``Is information processing from all SLUs completed?'' is YES, the terminal unit ``selects the TEUs one after another and analyzes the MFT information,'' and ``sends a command based on the central office line information.'' If "Is it necessary?" is YES, the distinction between central office line calling, extension calling, etc., and the calling/receiving regulation unit OAD
Based on the setting information, if it is a “local line call request”,
It is determined whether the request can be received based on whether or not all of the station lines SL ₁ to _{SL n} are busy, and if the answer is YES, it selects the relevant SLU/TEU, sends an operation command, and After performing the “timer processing” of
An exchange connection is established by controlling the crosspoint CP and "closing the corresponding communication path."

Also, if it is an “extension call request”, the link circuit
It is determined whether the request can be accepted depending on whether or not all of _L1 to _Lp are busy, and if the answer is YES, it selects the relevant TEU, sends an operation command, and performs timer processing. “Closing the corresponding call path”
Do this.

When the above call status ends, the call is terminated, the corresponding TEU is selected and a recovery command is sent, the corresponding SLU is selected and a recovery command is sent, and the corresponding call path is ``Release'' restores the exchange connection state.

When these processes are completed, it is determined whether "information processing from all TEUs has been completed", "timer detection processing" described later is performed, and "MFT is sent to all TEUs".
The above-mentioned terminal units TEU ₁ ~ TEU _o and telephones MFT ₁ ~ MFT _o
data signals are sent and received between
If the question ``Has information transmission/reception with the MFT been completed?'' becomes YES, one cycle between ``Start check'' in FIG. 4 ends.

In addition, (station line reservation) is a reservation for a central office line SL by pressing the central office line selection button on the telephone MFT before off-hook of the telephone MFT.
In principle, it is assumed that one of the station lines SL ₁ to _{SL n} is not busy, and this (station line reservation)
is automatically released if the telephone MFT is not off-hook within a certain period of time, such as 5 seconds, after pressing the central office line selection button.

In addition, in the case of an "extension call request", the circuit will be restored if there is no response within a predetermined time such as 30 seconds even if the other party is called, and in order to regulate this time, the processor CPUm A timer is configured in the internal line, a timer is configured for a certain period of time depending on (local line reservation), a timer is activated for a certain period of time depending on an “extension call request”, and a timer is configured for a certain period of time depending on the
In the ``timer processing'' of ``select TEU and send operation command'' and ``select relevant TEU and send operation command'', each timer is stopped.

Therefore, in the "timer detection process that follows after information processing from all TEUs is completed," it is checked that these timers have not timed up, and on this premise, the process moves to the next step. It has become something to do.

In other words, the variable memory RAM in the main control unit MCU includes each unit SLU ₁ to SLU _n , TEU ₁
The address corresponding to ~TEU _o is set,
To these addresses each unit SLU ₁ ~ _{SLU n} ,
Information corresponding to the operating status of each office line SL _{1 to SL n} and each telephone MFT ₁ to MFT _o transmitted from TEU 1 to TEU _o is stored, and based on this information, the main control unit
Control is performed from the MCU, and each unit SLU ₁ to SLU _n , TEU ₁ to
The processors CPU ₃ and CPUt of TEU _o are also provided with memory such as a variable memory RAM that temporarily stores information sent and received from the main control unit MCU, respectively, and each terminal unit TEU ₁
The memory for transmitting and receiving provided in the processor CPUt of ~TEU _o is the memory of the telephone MFT ₁ ~MFT _o
When transmitting and receiving information to and from the terminal, it is designed to operate as a receiver and a transmitter, respectively.

However, "check start" in polling signal transmission from the main control unit MCU is performed periodically, and subsequent information transmission is also performed periodically, and only one piece of information is transmitted in one information transmission. Therefore, each unit SLU ₁ to SLU _n ,
When information on status changes such as incoming/outgoing calls and call termination is accumulated on the TEU ₁ to TEU _o side, the terminal unit TEU ₁
The information storage capacity of the memory in ~TEU _o is limited, and old information received from the main control unit MCU that has not yet been transmitted to the telephone _MFT1 ~MFT _o is overflowed by new information. As a result, the state information stored in the memory and the actual state of the telephone no longer match, resulting in control problems. For example, even though the loop circuit for the office line in use has been opened by "end call," the information for turning off the indicator lights of the corresponding telephones MFT ₁ to MFT _o is not available to the telephones MFT ₁ to MFT o.
The call was lost before it was transmitted to the MFT _o , resulting in drawbacks such as the busy status being displayed indefinitely even when the call was not busy.

The present invention solves these drawbacks, and
Checks the contents of a state memory that stores the state of key telephones and central office lines based on information from each interface, and sends reset information to each interface when it determines that all key telephones and central office lines are idle. It is designed to send out. With this arrangement, the reset signal brings each key telephone and the central office line into the idle state.

The details of the present invention will be explained below with reference to FIG. 6 and subsequent figures showing embodiments.

Figure 6 is a time chart similar to Figure 4, in which the main control unit MCU is activated by starting "check".
Processor CPUm in each unit SLU ₁ ~
After checking the presence or absence of information generated on the SLU _n and TEU ₁ to TEU _o sides, the processor CPUm in the main control unit checks each unit SLU ₁ in the attached variable check RAM during period _tc .
The contents of each address corresponding to 〜SLU _n , TEU ₁ 〜TEU _o are checked in sequence, so the contents of each address, that is, each unit SLU ₁ 〜 _{SLU n} ,
If the information indicating the status of each station line SL _{1 to SL n and} each telephone MFT ₁ to MFT _o sent from TEU 1 to TEU o all indicates the idle state,
“Send reset command” uses the reset command as information to send each unit SLU ₁ to SLU _n , TEU ₁ to TEU _o
sequentially sent to each unit SLU ₁ to SLU _n
restores the relay HS to reset the station lines SL ₁ to _{SL n} to the idle state, and also resets each unit.
TEU ₁ -TEU _o transmit this reset information to each corresponding telephone MFT ₁ -MFT _o to reset each telephone's visual and audible display, call path, and amplifier to an idle state.

Therefore, if each unit SLU ₁ to _{SLU n} is in a busy state for acquiring a central office line, unlike the idle state indicated by the memory, or the telephone MFT ₁ to
Even if the MFT _o still has a visible or audible indication or an amplifier on state, everything is reset to an idle state, eliminating any discrepancies with memory.

After that, the same operation as in Fig. 4 is performed, but
Every time a check is completed after "check start", the contents of the variable memory RAM of the main control unit MCU are checked periodically, and the contents of the variable memory RAM are transferred from each unit SLU ₁ to SLU _n , TEU ₁ to TEU _o. "Sending a reset command" is performed only when the information indicates that all the devices are in an idle state.

FIG. 7 is a flowchart corresponding to FIG. 5 for performing the above operations, and the processing contents for "end of call", "local line call request", and extension call request in FIG. "Line call request, extension call request, call termination, processing" are entered all at once, and "timer detection processing" is entered all at once.
Check the contents of the addresses corresponding to each unit SLU ₁ to _{SLU n} , TEU ₁ to TEU _o in the variable memory RAM in the main control unit MCU, and check whether the SLU and all TEUs are idle. It is determined whether the central office lines SL ₁ to SL _n corresponding to each unit SLU ₁ to _{SLU n} and the telephones MFT ₁ to MFT _o corresponding to each unit TEU ₁ to TEU _o are in an idle state. Result is YES
If so, it is supposed to "send a reset command to all SLUs and all TEUs." In addition, the fifth
It is similar to the figure.

As mentioned above, each unit SLU ₁ ~ SLU _n , TEU ₁
If the status information of the office lines SL _{1 -SL n and} the telephones MFT ₁ -MFT _o stored in the variable memory RAM corresponding to ~TEU o are all in the idle state, each unit SLU ₁ ~SLU _n , TEU ₁ ~ Since the processor of the main control unit MCU sends reset information to TEU _o , each station line SL ₁ to
SL _n and each of the telephones MFT ₁ to MFT _o are reset to the idle state, the discrepancy between the state indicated by the memory and the actual state is eliminated, and phenomena such as unnecessary lighting of the indicator light are prevented.

In addition, the main control unit MCU processor
The periodic content check that CPUm performs on the variable memory RAM is performed by the central office line unit depending on the conditions.
It may be performed only for addresses corresponding to SLU ₁ to _{SLU n} or addresses corresponding to terminal units TEU ₁ to TEU _o . be.

As is clear from the above explanation, according to the present invention, the system resets the telephone, etc. in the memory every time it is idle to match the state in the memory, so it is possible to prevent control errors due to mismatches. It will be done.

[Brief explanation of drawings]

Figures 1 to 5 show a "key telephone exchange system" as an example of a complex system. Figure 1 is a block diagram of the entire configuration, Figure 2 is a block diagram of the central office line unit, and Figure 3 is a block diagram of the terminal unit. block diagram,
FIG. 4 is a time chart showing the information transfer operation between each unit and the telephone set by the main control unit, and FIG. 6 and subsequent figures show an embodiment of the present invention. FIG. 6 is a time chart similar to FIG. 4, and FIG. 7 is a flow chart similar to FIG. 5. MCU……Main control unit, SLU ₁ ~ SLU _n ……
Central office line unit, TEU ₁ to TEU _o ...Terminal unit,
CPUm, CPUs, CPUt...processor.

Claims (1)

[Scope of Claims] 1. A processor that accommodates a plurality of key telephones and central office lines via a terminal interface and a central office line interface, and performs call origination and reception control based on information from the terminal interface and central office line interface. A button telephone device comprising a state memory that stores the state of the key telephones and central office lines based on information from each interface, and a processor checks the contents of the state memory to determine whether all key telephones and central office lines are idle. 1. A reset method for a controlled unit, characterized in that when it is determined that the unit is in the idle state, reset information is sent to each interface so that the state of each key telephone and office line corresponds to an idle state.