JP2017022615A - Synchronous communication method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a synchronous communication method for selecting a correct communication scheme in determining communication schemes compatible with new and old communication between a controller and a sensor.SOLUTION: At the time of starting synchronous communication, a first synchronous code C1 is transmitted from a control unit 30 to a sensor 20 before a second synchronous code C2. When the sensor 20 normally receives the first synchronous code C1 transmitted by the control unit 30, it transmits a reception success code A to the control unit 30, and when it succeeds the synchronization with the first synchronization code C1, it transmits a first establishment code as a synchronization state code B to the control unit 30. When the control unit 30 receives the reception success code A but does not receive the first establishment code as the synchronization state code B, it determines that the sensor 20 does not support a communication scheme based on the first synchronization code C1, and transmits a second synchronization code C2 to the sensor 20.SELECTED DRAWING: Figure 1A

Description

  The present invention relates to a synchronous communication method, and more particularly, to a synchronous communication method for an automatic faucet device that detects water with a sensor by a user's hand out and stops water.

  Automatic faucet devices that automatically discharge and stop water when a user puts out or retracts a hand in a toilet or washroom of public facilities such as stations, restaurants, hotels, and large commercial facilities are widely used. Has been.

  The automatic faucet device communicates information such as the sensing state of the human body, LED display state, temperature, and learning result obtained by the sensor to the controller, and the normal communication between the sensor and the controller. It is possible to control the water discharge and water stop operation of the automatic water faucet device through the exchange, thereby improving convenience and water saving.

  An example of a communication method in normal communication between the sensor and the controller is shown in FIG. The new sensor 102 is obtained by changing or improving the performance of the old sensor 100. The old controller 200 corresponds to the old communication method with the old sensor 100, and the new controller 202 corresponds to the new communication method with the new sensor 102. Normal communication is performed based on the corresponding communication method, and the sensor and the controller can use the functions included in this communication method.

  As shown in FIG. 5, by allowing the new sensor 102 to support the old communication method with the old controller 200, the old sensor 100 is replaced with the new sensor 102 as it is in a product equipped with the old controller 200. Is preferable. Similarly, by enabling the new controller 202 to support the old communication method with the old sensor 100, the old controller 200 can be replaced with the new controller 202 as it is in a product in which the old sensor 100 is mounted. preferable.

In order to ensure compatibility with such a conventional product, a control method is required in which both the controller and the sensor guarantee the old communication method and the new communication method.

  In order to ensure compatibility between the controller and the sensor, there is a method of bringing the controller and the sensor into a synchronized state by performing synchronous communication. As synchronous communication, there is a frame synchronization system as in Patent Document 1 (see Patent Document 1).

  An example of synchronous communication between the sensor and the controller is shown in FIG. In FIG. 6, the new synchronization code for synchronization as the new communication method and the old synchronization code for synchronization as the old communication method are alternately transmitted from the controller to the sensor, so that the synchronization is established. This is a method of performing normal communication by a communication method.

Japanese Patent No. 2591296

  However, in this method, the controller cannot determine whether the sensor has successfully received the new synchronization code transmitted from the controller. Here, when the new controller and the new sensor are connected, if the new synchronization code sent from the controller after synchronization communication fails due to noise, etc., it should be synchronized as a new communication method. Nevertheless, there is a possibility that the controller transmits the old synchronization code and mistakenly synchronizes as the old communication method. In this case, since the information of the new sensor is not included in the old communication method, the function as the new sensor cannot be used.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to select a correct communication method as a communication method between a controller and a sensor compatible with old and new communication.

  In order to achieve the above object, according to a synchronous communication method according to an aspect of the present invention, a synchronization code is transmitted from a control unit having at least a first synchronization code and a second synchronization code as a synchronization code to a detection unit, and transmitted. A synchronization communication method in which the control unit performs setting based on the transmitted synchronization code when the synchronization code is synchronized with the detection unit, and the detection unit detects that the synchronization code has been successfully received. It has a reception success code transmitted to the control means and a synchronization propriety code transmitted to the control means according to the synchronization code information, and the control means detects the first synchronization code at the start of synchronous communication A first transmission step for transmitting to the means, a response step for receiving the reception success code transmitted from the detection means after performing the first transmission step, and a transmission from the detection means after performing the response step A synchronization establishment process for determining whether synchronization is established by receiving the synchronization enable / disable code, a first setting process for performing settings based on the first synchronization code when the synchronization establishment process is established, and a response process is established However, when the synchronization establishment process is not established, after the second transmission process for transmitting the second synchronization code to the detecting means and the second transmission process, the second synchronization code can be synchronized. And a second setting step for performing setting based on the second synchronization code.

  According to this configuration, when performing synchronous communication, the synchronization code transmitted from the control unit to the detection unit is first transmitted from the first synchronization code prior to the second synchronization code. The detecting means transmits the reception success code and the synchronization propriety code to the control means according to the synchronization code transmitted from the control means. After the first transmission process is performed, a response process is performed and a synchronization establishment process is performed. Is performed, the control means determines that the detection means does not correspond to the communication method based on the first synchronization code, and then transmits the second synchronization code to the detection means. Therefore, since the second transmission step is not performed unless the response step is performed, the detection means can synchronize with both the first synchronization code and the second synchronization code, and the first synchronization code is higher than the second synchronization code. In the case where it is preferable to synchronize with the synchronization code, it is possible to prevent erroneous synchronization with the second synchronization code.

  In the synchronous communication method according to one aspect of the present invention, the control unit may perform the first transmission step a plurality of times before performing the second transmission step.

  In the present invention configured as described above, it is assumed that synchronization is not established due to the influence of, for example, garbled data in one transmission, although the detection means should be synchronized with the first synchronization code. However, by performing the first transmission step a plurality of times before moving to the second transmission step, it is possible to reduce the probability that such a synchronization error will occur.

  The synchronous communication method according to one aspect of the present invention may further include a third transmission step in which the control unit performs the first transmission step again after the detection unit and the control unit are synchronized by the second transmission step. Good.

  In the present invention configured as described above, even if synchronization with the second synchronization code is erroneously established, synchronization with the first synchronization code is established by performing the first transmission step again. And the settings can be updated to the correct communication method.

  In the synchronous communication method according to one aspect of the present invention, the control unit may perform the third transmission step only for a predetermined period.

  In the present invention configured as described above, the control unit can reduce power consumption due to unnecessary communication by ending the third transmission step when a predetermined period has elapsed.

  According to the present invention, the correct communication method can be selected as the communication method between the controller and the sensor compatible with the old and new communication.

It is a block diagram showing the main structures of the automatic water faucet device by embodiment of this invention. FIG. 4 is a relationship diagram of codes used for synchronous communication according to an embodiment of the present invention. It is a flowchart of the control part in the main process of the synchronous communication by embodiment of this invention. It is a flowchart of the control part in the sub process of the synchronous communication by embodiment of this invention. It is a flowchart of the control part in the main process of the synchronous communication by the modification 1 of this invention. It is a flowchart of the control part in the sub process of the synchronous communication by the modification 1 of this invention. It is a flowchart of the control part in the sub process of the synchronous communication by the modification 2 of this invention. It is an example of the communication system in normal communication with a sensor and a controller. It is an example of the synchronous communication of a sensor and a controller.

  A synchronous communication method according to an embodiment of the present invention will be described below with reference to the attached materials.

<Configuration of automatic faucet device>
First, a configuration of an automatic faucet device to which a synchronous communication method according to an embodiment of the present invention is applied will be described with reference to FIG. 1A. FIG. 1A is a block diagram showing a main configuration of an automatic water faucet device according to an embodiment of the present invention.

  As shown in FIG. 1A, the automatic faucet device 1 includes a spout 12 provided at the front end of a faucet body, an on-off valve 14 that opens and closes water from the spout 12 by opening and closing, and a human body. And a control unit (control unit) 30 for controlling the opening / closing of the on-off valve 14 in response to the detection of the sensor 20. The control unit 30 receives power supply from the power supply 40 and performs a control operation.

  The sensor 20 transmits a detection result signal of the human body to the control unit 30, and the control unit 30 opens and closes the on-off valve 14 in accordance with the detection result signal, and discharges and stops water from the outlet 12. Normal communication.

<Synchronous communication between controller and sensor>
Next, with reference to FIG. 1B, a communication method set by synchronous communication according to an embodiment of the present invention will be described. FIG. 1B is a relationship diagram of codes used for synchronous communication according to an embodiment of the present invention.

  As shown in FIG. 1A, the control unit 30 has a synchronization code C. The sensor 20 has a reception success code A and a synchronization enable / disable code B. When the control unit 30 is activated by supplying power from the power supply 40, the control unit 30 performs synchronous communication by transmitting the synchronization code C to the sensor before performing normal communication between the control unit 30 and the sensor 20.

  If the sensor 20 properly receives the synchronization code C transmitted from the control unit 30, the sensor 20 transmits a reception success code A to the control unit 30. Further, the sensor 20 transmits a synchronization propriety code B corresponding to the content of the synchronization code C transmitted from the control unit 30 to the control unit 30.

  Here, assuming that there are the new control unit 30a and the old control unit 30b as the control unit 30 and the new sensor 20a and the old sensor 20b as the sensor 20, the communication contents in these synchronous communications will be described.

  As shown in FIG. 1B, the old control unit 30b has the second synchronization code C2 as the synchronization code C, and the old sensor 20b has the second establishment code B2 as the synchronization availability code B. Further, the new control unit 30a has the first synchronization code C1 and the second synchronization code C2 as the synchronization code C, and the new sensor 20a has the first formation code B1 and the second formation code B2 as the synchronization availability code B. .

  In the synchronous communication, when the second synchronization code C2 is transmitted from the old control unit 30b to the old sensor 20b, the old sensor 20b transmits the second establishment code B2 as the synchronization availability code B to the old control unit 30b. When the old control unit 30b receives the second establishment code B2, the old control unit 30b determines that the old sensor 20b corresponds to the second synchronization code C2, and sets the communication method based on the second synchronization code C2. .

  In the synchronous communication, when the first synchronization code C1 is transmitted from the new control unit 30a to the new sensor 20a, the new sensor 20a transmits the first establishment code B1 to the new control unit 30a as the synchronization availability code B. When the new control unit 30a receives the first establishment code B1, the new control unit 30a determines that the new sensor 20a corresponds to the first synchronization code C1, and sets the communication method based on the first synchronization code C1. .

  Furthermore, in the synchronous communication, when the second synchronization code C2 is transmitted from the new control unit 30a to the old sensor 20b, the old sensor 20b transmits the second establishment code B2 as the synchronization availability code B to the new control unit 30a. When the new control unit 30a receives the second establishment code B2, the new control unit 30a determines that the old sensor 20b corresponds to the second synchronization code C2, and sets the communication method based on the second synchronization code C2. .

  In the synchronous communication, since the old sensor 20b does not support the first synchronization code C1, even if the first synchronization code C1 is transmitted from the new control unit 30a to the old sensor 20b, the first establishment code B1 is old. There is no transmission from the sensor 20b to the new controller 30a. Therefore, the new control unit 30a and the old sensor 20b are not set to the communication method based on the first synchronization code C1.

  Since the old control unit 30b does not have the first synchronization code C1 as the synchronization code C, the old control unit 30b and the old sensor 20b and the old control unit 30b and the new sensor 20a are based on the first synchronization code C1. The communication method is not set.

  By doing in this way, even in the combination of the old control unit 30b and the new sensor 20a and the new control unit 30a and the old sensor 20b, the communication method based on the second synchronization code C2 can be set, and the function as the communication method can be set. Can be used.

  On the other hand, since the new control unit 30a has the second synchronization code C2 and the new sensor 20a corresponds to the second synchronization code C2, the new control unit 30a starts the new control unit 30a in a state where no communication method is set. When the second synchronization code C2 is transmitted to the sensor 20a, the communication method based on the second synchronization code C2 may be set between the new control unit 30a and the new sensor 20a. In that case, a function as a communication method based on the first synchronization code C1 cannot be used.

  Normal communication is not performed until the communication method is set by synchronous communication. When the communication method is set, the sensor 20 and the control unit 30 perform normal communication using the set communication method, and the communication method is set to the set communication method. The water stopping control of the automatic faucet device 1 can be performed using the included function.

  Further, the control unit 30 includes a counter 36 and a timer 38. As will be described later, the counter 36 counts based on the code received from the sensor 20, and the timer 38 counts the time until the synchronous communication is terminated. At the start of synchronous communication, the counter 36 and the timer 38 are zero.

<Communication communication flow>
Next, a control flow of synchronous communication according to the embodiment of the present invention will be described with reference to FIGS. 2A and 2B. FIG. 2A is a flowchart of the control unit in the main process of synchronous communication according to the embodiment of the present invention. FIG. 2B is a flowchart of the control unit in the synchronous communication sub-process according to the embodiment of the present invention.

  Synchronous communication is roughly divided into two types: a main process for setting a communication method in normal communication and a sub-process for confirming whether an incorrect communication method is set in the main process.

<Main processing>
First, when synchronous communication starts, the control unit 30 starts from the main process. As shown in FIG. 2A, the control unit 30 determines whether or not the count of the counter 36 is less than +3 (S1).

  In step S1, if the count of the counter 36 is less than +3, the control unit 30 transmits the first synchronization code C1 to the sensor 20 (S2).

  When the first synchronization code C1 is transmitted from the control unit 30 in step S2, the sensor 20 transmits the reception success code A to the control unit 30 when the first synchronization code C1 is properly received. If the sensor 20 corresponds to the first synchronization code C1, the first establishment code B1 is transmitted to the control unit 30 as the synchronization availability code B.

  After performing step S2, the control unit 30 first determines whether or not the reception success code A from the sensor 20 has been received (S3). If it is determined in step S3 that the reception success code A has been received, it is next determined whether or not the first establishment code B1 has been received from the sensor 20 (S4). If it is determined in step S4 that the first establishment code B1 has been received, the control unit 30 sets the communication method based on the first synchronization code C1, and simultaneously resets the count of the counter 36 (S6). And the main process in synchronous communication is complete | finished.

  If it is not determined in step S3 that the control unit 30 has received the reception success code A, the count of the counter 36 is reset (S6), and the process returns to step S1.

  If it is not determined in step S4 that the control unit 30 has received the first establishment code B1, the control unit 30 increments the count of the counter 36 by 1 (S7) and returns to step S1.

  Subsequently, when it is determined in step S1 that the count of the counter 36 is +3 or more, that is, after the synchronous communication is started, the sensor 20 properly receives the first synchronization code C1 three times in succession and synchronization is established. If not, the control unit 30 transmits the second synchronization code C2 to the sensor 20 and simultaneously resets the count of the counter 36 (S8).

  When the sensor 20 receives the second synchronization code C2 from the control unit 30 in step S8, if the sensor 20 at this time corresponds to the second synchronization code C2, the second establishment code is set as the synchronization availability code B. B2 is transmitted to the control unit 30.

  After performing step S8, the control unit 30 determines whether or not the second formation code B2 is received from the sensor 20 (S9). If it is determined in step S9 that the second establishment code B2 has been received, the control unit 30 sets the communication method based on the second synchronization code C2 (S10). And the main process in synchronous communication is complete | finished.

  If it is determined in step S9 that the second formation code B2 has not been received, the process returns to step S1.

<Sub processing>
When the main process is completed in the synchronous communication, the process proceeds to the sub process. As shown in FIG. 2B, when the sub-process is started, the control unit 30 determines whether or not the communication method based on the second synchronization code C2 is set in the main process (S11).

  If it is determined in step S11 that the communication method based on the second synchronization code C2 is set, the control unit 30 starts the timer 38 (S12). In step S11, when it is determined that the communication method based on the second synchronization code C2 is not set, that is, when it is determined that the communication method based on the first synchronization code C1 is set, the control unit 30 The sub-process in the synchronous communication is finished.

  After starting the timer 38 in step S12, the control unit 30 determines whether the count of the timer 38 has passed the predetermined time X (S13). When it is determined that the count of the timer 38 has passed the predetermined time X, the count of the timer 38 is cleared (S14), and the sub-process in the synchronous communication is terminated.

  In step S13, when it is determined that the count of the timer 38 has not passed the predetermined time X, the control unit 30 transmits the first synchronization code C1 to the sensor 20 (S15).

  When the first synchronization code C1 is transmitted from the control unit 30 in step S15, the sensor 20 is the first establishment code as the synchronization availability code B if the sensor 20 corresponds to the first synchronization code C1. B1 is transmitted to the control unit 30.

  After performing Step S15, the control unit 30 determines whether or not the first establishment code B1 is received from the sensor 20 (S16). If it is determined in step S16 that the first establishment code B1 has been received, the control unit 30 changes the setting to the communication method based on the first synchronization code C1, and simultaneously clears the count of the timer 38 (S17). Then, the sub-process in the synchronous communication is finished.

  If it is not determined in step S16 that the first formation code B1 has been received, the process returns to step S13.

  When the sub-process in the synchronous communication is completed, the sensor 20 and the control unit 30 start normal communication based on the set communication method.

<Action and effect>
Next, the effect of the synchronous communication according to the embodiment of the present invention will be described.

  In the embodiment of the present invention, at the start of synchronous communication, the first synchronization code C1 is first transmitted from the control unit 30 to the sensor 20 before the second synchronization code C2. When the sensor 20 properly receives the first synchronization code C1 transmitted from the control unit 30, the sensor 20 transmits a reception success code A to the control unit 30, and then succeeds in synchronization with the first synchronization code C1. In this case, the synchronization availability code B is transmitted to the control unit 30. At this time, when the control unit 30 receives the reception success code A but does not receive the first establishment code B1, the control unit 30 determines that the sensor 20 does not correspond to the communication method based on the first synchronization code C1. Thereafter, the second synchronization code C2 is transmitted to the sensor 20. Accordingly, the sensor 20 can be synchronized with both the first synchronization code C1 and the second synchronization code C2, and it is preferable that the sensor 20 be synchronized with the first synchronization code C1 rather than the second synchronization code C2. The establishment of synchronization with the second synchronization code C2 can be suppressed.

  Further, the control unit 30 transmits the first synchronization code C1 a plurality of times, and transmits the second synchronization code C2 when the synchronization is not established in all cases, although it has been properly received three times in succession. As a result, even if the synchronization is not established despite the fact that the sensor 20 should originally synchronize with the first synchronization code C1 due to, for example, data corruption in one transmission, the second synchronization code C2 By performing the transmission of the first synchronization code C1 a plurality of times before transmitting the above, it is possible to reduce the probability that such a synchronization error will occur.

  Furthermore, when the synchronization with the second synchronization code C2 is established, the control unit 30 continues the synchronous communication until the count of the timer 38 elapses the predetermined time X. Thereby, even if the synchronization with the second synchronization code C2 is erroneously established, the synchronization with the first synchronization code C1 can be established by transmitting the first synchronization code C1 again, Settings can be updated to the correct communication method.

  Further, the control unit 30 ends the synchronous communication when the count of the timer 38 has passed the predetermined time X. Thereby, the power consumption by unnecessary communication can be reduced.

<Modification>
As mentioned above, although embodiment of the technique which this application discloses was described, the technique which this application discloses is not limited above.

<Modification 1>
For example, in the above embodiment, the control unit 30 has the first synchronization code C1 and the second synchronization code C2 as the synchronization code C. However, the present invention is not limited to this, and the third synchronization code C3 is further provided. You may have. FIG. 3A is a flowchart of the control unit in the main process of synchronous communication according to the first modification of the present invention. FIG. 3B is a flowchart of the control unit in the synchronous communication sub-process according to the first modification of the present invention.

  Here, if the sensor 20 is compatible with the communication method based on the third synchronization code C3, the third synchronization code C3 is established as the synchronization availability code B when the third synchronization code C3 is properly received from the control unit 30 in the synchronous communication. The code B3 is transmitted to the control unit 30.

  In the first modification, the second synchronization code C2 includes the same code as the third synchronization code C3. Therefore, even if the sensor 20 corresponds to the communication method based on the first synchronization code C1 or the second synchronization code C2, the third synchronization code C3 is transmitted from the control unit 30 to the sensor 20 in the synchronous communication. Then, synchronization is established and the communication method based on the third synchronization code C3 may be set.

  In the main process in the first modification, as shown in FIG. 3A, in step S′8, the control unit 30 determines whether or not the count of the counter 36 is less than +6 (S′8). In step S′8, if the count of the counter 36 is less than +6, the control unit 30 transmits the second synchronization code C2 to the sensor 20 (S′9).

  When the second synchronization code C2 is transmitted from the control unit 30 in step S′9, the sensor 20 transmits a reception success code A to the control unit 30 when the second synchronization code C2 is properly received. If the current sensor 20 corresponds to the second synchronization code C2, the second establishment code B2 is transmitted to the control unit 30 as the synchronization availability code B.

  After performing step S'9, the control unit 30 first determines whether or not the reception success code A from the sensor 20 has been received (S'10). If it is determined in step S'10 that the reception success code A has been received, it is next determined whether or not the second formation code B2 has been received from the sensor 20 (S'11). If it is determined in step S′11 that the second establishment code B2 has been received, the control unit 30 sets the communication method based on the second synchronization code C2 and simultaneously resets the count of the counter 36 (S '12). And the main process in synchronous communication is complete | finished.

  If it is not determined in step S'10 that the control unit 30 has received the reception success code A, the count of the counter 36 is set to +3 (S'13), and the process returns to step S1.

  If it is not determined in step S′11 that the control unit 30 has received the second formation code B2, the control unit 30 increases the count of the counter 36 by +1 (S′14), and proceeds to step S1. And turn back.

  If it is determined in step S′8 that the count of the counter 36 is not less than +6, that is, the sensor 20 has received the first synchronization code C1 and the second synchronization code C2 three times in succession after the start of synchronous communication. If none of the synchronization is established, the control unit 30 transmits the third synchronization code C3 to the sensor 20 and simultaneously resets the count of the counter 36 (S′15). Thereafter, the flow corresponds to the transmission of the third synchronization code C3 (S'16, 17).

  In the sub-process in the first modification, as shown in FIG. 3B, when the communication method based on the second synchronization code C2 is set in the main process, the first synchronization code C1 is transmitted in the same manner as in the above embodiment. If the communication method based on the third synchronization code C3 is set in the main process (S′19 to S′24), the first synchronization code C1 and the second synchronization code C2 are transmitted for a predetermined time ( S'19 to S'27).

  As described above, when the control unit 30 transmits the second synchronization code C2 to the sensor 20 before the third synchronization code C3 and receives the reception success code A but does not receive the second formation code B2, the sensor 30 20 is determined not to correspond to the communication method based on the second synchronization code C2, and the third synchronization code C3 is transmitted to the sensor 20. As a result, the second synchronization code C2 includes the same code as the third synchronization code C3, and the sensor 20 can be synchronized with both the second synchronization code C2 and the third synchronization code C3. In the case where it is preferable to synchronize with the second synchronization code C2 rather than the code C3, it is possible to prevent erroneous synchronization with the third synchronization code C3.

<Modification 2>
Moreover, in the said embodiment, although the control part 30 had the timer 38 for counting time until a synchronous communication is complete | finished in a sub process, this invention is not limited to this, The control part 30 is A counter 36 may be used instead of the timer 38. FIG. 4 is a flowchart of the control unit in the synchronous communication sub-process according to the second modification of the present invention.

  The main process of synchronous communication according to the second modification is the same as that in the above embodiment shown in FIG. 2A.

  As shown in FIG. 4, when the sub process is started, the control unit 30 determines whether or not the communication method based on the second synchronization code C2 is set in the main process (S ″ 11).

  When determining in step S ″ 11 that the communication method based on the second synchronization code C2 is set, the control unit 30 determines whether or not the count of the counter 36 is +5 (S ″ 12). . When it is determined that the count of the counter 36 is +5, the count of the counter 36 is cleared (S ″ 13), and the sub-process in the synchronous communication is ended.

  When it is determined in step S ″ 11 that the communication method based on the second synchronization code C2 is not set, that is, when it is determined that the communication method based on the first synchronization code C1 is set, the control unit 30 ends the sub-process in the synchronous communication.

  When determining in step S ″ 11 that the count of the counter 36 is less than +5, the control unit 30 transmits the first synchronization code C1 to the sensor 20 (S ″ 14).

  When the first synchronization code C1 is transmitted from the control unit 30, the sensor 20 transmits the first establishment code B1 to the control unit 30 as the synchronization availability code B if the sensor 20 corresponds to the first synchronization code C1. Send.

  After performing step S ″ 14, the control unit 30 determines whether or not the first establishment code B1 is received from the sensor 20 (S ″ 15). If it is determined in step S ″ 15 that the first establishment code B1 has been received, the control unit 30 changes the setting to the communication method based on the first synchronization code C1, and simultaneously clears the count of the counter 36 (S "16). Then, the sub-process in the synchronous communication is finished.

  If it is not determined in step S ″ 15 that the first formation code B1 has been received, the control unit 30 increases the count of the counter 36 by +1 (S ″ 17), and returns to step S ″ 12.

  Thus, when the synchronization with the second synchronization code C2 is established, the control unit 30 determines that the count of the counter 36 is +5, that is, after the synchronization with the second synchronization code C2 is established, the first synchronization code C1. If the synchronization with the second synchronization code C2 is mistakenly established by continuing the synchronous communication until the first transmission is performed five times, the first synchronization code C1 is transmitted again to perform the first synchronization. Synchronization with the code C1 can be established, and the setting can be updated to the correct communication method.

  Furthermore, the control unit 30 can reduce power consumption due to unnecessary communication by terminating the synchronous communication when the counter 36 is counted five times.

  Moreover, in the said modification 2, although the count of the counter 36 which complete | finishes synchronous communication was set to +5, this invention is not restricted to this, You may change suitably according to a use.

  In the above embodiment, the count of the counter 36 for shifting to S7 in which the control unit 30 transmits the second synchronization code C2 is set to +3. However, the present invention is not limited to this. It may be changed.

  The elements included in each of the embodiments described above can be combined as much as technically possible, and combinations thereof are also included in the scope of the present invention as long as they include the features of the present invention.

DESCRIPTION OF SYMBOLS 1 Automatic faucet device 12 Water outlet 14 On-off valve 20 Sensor (detection means)
20a New sensor 20b Old sensor 30 Control unit (control means)
30a New control unit 30b Old control unit 36 Counter 38 Timer 40 Power supply A Reception success code B Synchronization enable / disable code B1 First formation code B2 Second formation code B3 Third formation code C Synchronization code C1 First synchronization code C2 Second synchronization code C3 Third synchronization code

Claims (4)

When the synchronization code is transmitted from the control means having at least the first synchronization code and the second synchronization code as the synchronization code to the detection means, and the transmitted synchronization code can be synchronized with the detection means, the transmitted A synchronous communication method in which the control means performs setting based on a synchronization code,
The detection means includes
A reception success code to be transmitted to the control means when the synchronization code is successfully received;
A synchronization propriety code to be transmitted to the control means according to the information of the synchronization code,
The control means includes
A first transmission step of transmitting the first synchronization code to the detection means at the start of synchronous communication;
A response step of receiving the reception success code transmitted from the detection means after performing the first transmission step;
A synchronization establishment step for determining whether synchronization is established by receiving the synchronization propriety code transmitted from the detection means after performing the response step;
When the synchronization establishment step is established, a first setting step for performing setting based on the first synchronization code;
A second transmission step of transmitting the second synchronization code to the detection means when the response step is successful but the synchronization establishment step is not established;
After performing the second transmission step, if it is possible to synchronize with the second synchronization code, a second setting step for performing setting based on the second synchronization code;
A synchronous communication method comprising: The control means performs the first transmission step a plurality of times before performing the second transmission step.
The synchronous communication method according to claim 1. After the synchronization between the detection unit and the control unit is established by the second transmission step, the control unit includes a third transmission step for performing the first transmission step again.
The synchronous communication method according to claim 1 or 2. The control means performs the third transmission step for a predetermined period;
The synchronous communication method according to claim 3.

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