JPH0621949A - Data transmitter - Google Patents

Abstract

PURPOSE:To reduce time loss for the restart of a system and to improve the reliability of the system by speedily detecting the setting error of addresses, especially, the double setting of addresses in the case of restarting the system. CONSTITUTION:The address data and control data or the like of plural slave stations 2, 3, 4... are exchanged by a polling system and a device, which is connected to the respective slave stations, to be controlled is controlled by a master station 1. The reception standby time of response data from the respective slave stations is extended sufficiently longer than normal reception standby time, the plural sets of response data from the respective slave stations can be received at the master station 1, and the result can be recorded in a memory area 1a in the master station 1. Only in the case of first polling at the master station 1, the respective slave stations 2, 3, 4... generate time from the reception of addresses to the slave stations themselves to the transmission of the response data by random function generating means 2b, 3b, 4b... in the slave stations themselves and transmit the response data after delaying responses corresponding to that time.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data transmission device for transmitting data between a main operation panel which is a master station and a terminal device which is a plurality of slave stations.

[0002]

2. Description of the Related Art In recent years, there has been provided a device for remotely controlling a controlled device connected to a terminal by operating a main operation panel to transmit data from a plurality of terminals to a predetermined terminal. ing. That is, the main operation panel is configured to sequentially output the listener address data and the control data for individually designating each terminal out of the plurality of connected terminals to the signal transmission path. Also, when the terminal device determines that the address data input from the signal transmission path specifies its own station, the terminal device controls the controlled device based on the control data following the address data.

Further, in recent data transmission apparatuses, after transmitting address data for individually designating each terminal unit from the main operation panel, receiving response data from each terminal unit, each terminal unit operates normally. After confirming that
There is also a device which transmits control data to remotely control a controlled device connected to a terminal.

In general, when controlling each terminal, the main operation panel also monitors them at the same time.
For talker address data that individually specifies terminals,
On the terminal side, the monitoring data is sent back to the main operation panel side to notify each abnormality.

[0005]

However, in the case of the above-mentioned conventional structure, an address setting error often becomes a problem, especially when the system is powered on. In general, a data transmission device may have ten to several hundred terminals, and when setting talker addresses and listener addresses individually, it is unavoidable that the addresses will be duplicated. If the system is started up, the response data from the terminal side to the main operation panel side and the monitoring data will have multiple collisions at the same address, and a data error may occur at that address on the main operation panel side. There is a nature. In that case, the main operation panel side does not know the cause of the data error and must worry about the failure of the terminal device at that address and the trouble of the signal line (noise etc.), so it is necessary to restart the system. However, there is a possibility that the controlled device connected to the terminal may malfunction due to an address setting error, and there are many problems in terms of reliability.

The present invention has been made in view of the above circumstances, and an object of the present invention is to quickly detect an address setting error, particularly an address duplication setting, at the time of start-up of a data transmission device system. It is an object of the present invention to provide a data transmission device capable of reducing the time loss associated with system restart and improving the system reliability.

[0007]

In the present invention, a master station and a plurality of slave stations are provided, and a signal transmission path is provided between them.
In a data transmission device in which the master station controls the controlled device connected to each slave station by sending and receiving address data, control data, etc. of each slave station, the first transmission from the master station to each slave station Only during the polling, the waiting time for receiving the response data from each slave station is extended to a time sufficiently longer than usual, and the master station can receive multiple response data from each slave station. The result can be recorded in the memory area in the master station, and at each slave station, only when the master station polls for the first time, the time from receiving the address addressed to itself to transmitting the response data can be set. It is characterized in that it is generated by the random function generating means in its own station, and the response data is transmitted with a time delay for the response accordingly.

[0008]

[Function] The master station transmits / receives data to / from each slave station by the polling method. However, only for the first time when the system is started up, the response waiting time from each slave station is set to be sufficiently long, and It is possible to receive a plurality of response data from each slave station. Also, in each slave station, the response data is transmitted with a random time delay only when the address addressed to itself is polled for the first time. Therefore, in this system, the master station side can quickly detect how many duplicates exist on a specific address in response to a setting error such as duplicate setting of the slave station address. It will be easy to restart.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. In this embodiment, the overall system configuration is the same as the conventional one, that is, in FIG. 1 showing the overall schematic configuration, the main operation panel 1 as a master station and the terminals 2, 3, which are a plurality of slave stations. 4 are connected via a signal transmission path 5. The main operation panel 1 has a memory area 1a, and when a plurality of response data from individual terminal addresses are received at the time of the first polling, those data can be recorded and each terminal 2 can be recorded. , 3, 4, ... Are individually output to the signal transmission line 5 and the control data are sequentially output.

Further, the terminals 2, 3, 4 ...
When the address data inputted from the address is an address designating the own station, the time until the response data is transmitted is generated by the random function generating means 2b, 3b, 4b ... In the own station, and the response is delayed accordingly. The response data is transmitted with the.

In this system, data is transmitted by a general procedure of address data transmission from the main operation panel 1, response data transmission from the terminals 2, 3, 4 ... Side, control data transmission from the main operation panel 1. It is assumed that transmission is in progress.

Next, the operation will be described with reference to FIG. 2 showing an operation flowchart of the main operation panel 1. In the figure, in step 1, n = 1 which is the initial value of the transmission address is set. Next, in step 2, the current address is transmitted.
If the response data from each terminal device at the address destination is received in step 3 and the response data is received, it is recorded in the memory 1a in step 4, and whether the standby time is exceeded in step 5 or not If the check is made and it is not over, the process from step 3 is repeated. If no response data is received in step 3, the process similarly branches to step 5 to check the standby time. If the waiting time is exceeded in step 5, the process proceeds to step 6 and it is checked in the record in the memory 1a whether there is only one responding station, and if there is only one station, control is performed in step 7. Send data.
If the responding station is other than 1 station (including the case of 0 station) in step 6, the process branches to step 8 and the transmission address is set to +1. Next, in step 9, the transmission address is compared with a predetermined maximum value (max value) of the terminal,
If it is smaller, it is assumed that the process has not been completed yet, and the polling process from step 2 is continued. If it exceeds the maximum value, the process proceeds to step 10, where the conventional general polling process starts for the first time.

Next, the operation of the terminals 2, 3, 4 ... Will be described with reference to FIG. In the figure, the terminal is always waiting for an address in step 11. If the address is received, it is checked in step 12 whether the address is addressed to the own station. If it is addressed to the own station, it is checked in step 13 whether it is the first polling. If it is the first polling, the procedure is proceeded to step 14. Then, a random function is generated, and in step 15, response data is transmitted with a delay time corresponding to the value.
If it is not the first polling, response data is immediately transmitted in step 16. Next, in step 17, control data is awaited to be received, and if there is reception, control processing of the controlled device connected to the terminal is performed in step 18. If no control data is received in step 17, the control data reception time is checked in step 19, and if it is not time out, the process branches to step 17 and the same process is repeated. The processing from 11 is repeated. If the address is not addressed to itself in step 12, the process from the beginning is similarly repeated.

As is clear from the above description, in the data transmission apparatus according to the present embodiment, in the main operation panel 1, each of the terminals 2, 3, 4 is only for the first time when the system is started up.
The response waiting time from ... is long enough, and a plurality of response data from each terminal 2, 3, 4 ... can be received, and at each terminal, the address of its own station is set. Since the response data is sent with a random time delay only at the first polling, the main operation panel 1 side has a number of duplicates for a specific address against a setting error such as duplicate setting of the terminal address. You can detect quickly.

In the above embodiment, the case where the respective terminal units are remotely and centrally controlled from the main operation panel has been described as an example, but according to the present invention, not only the control but also the respective terminal units are monitored. It is also effective in cases. In other words, in this case, the address is sent from the main operation panel, and the monitoring data is sent from each terminal side in correspondence with that address, and the monitoring data is also delayed by random time only for the first polling. If the main operation panel side takes a sufficiently long response waiting time only during the first polling and makes it possible to receive multiple data, the number of duplicated addresses on the corresponding address It can be detected immediately. Immediately after starting up the system, it is rare to take immediate action immediately, and it is common to warm up, so if you use the time during this period, it is possible to take some time for the first polling. Therefore, if the waiting time for the first polling is long enough, the random time is unlikely to match and the number of duplicated addresses is unlikely to occur so much that the response data is less likely to collide. Become.

[0016]

As described above, according to the data transmission apparatus of the present invention, it is possible to quickly detect an address setting error at the time of system start-up, particularly an address duplicate setting, and to re-start the system. It has an excellent effect that the loss of time can be reduced and the reliability of the system can be improved.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of the entire system.

FIG. 2 is a flowchart showing the operation of the main operation panel in the embodiment of the present invention.

FIG. 3 is a flowchart showing the operation of the terminal according to the embodiment of the present invention.

[Explanation of symbols]

1 is a main operation panel (master station), 1a is a memory area, 2, 3, 4
Is a terminal (slave station), 2b, 3b, 4b is a random function generating means, and 5 is a signal transmission path.

Claims (1)

[Claims] 1. A master station and a plurality of slave stations are provided, and address data, control data, etc. of each slave station are transmitted and received by a polling method via a signal transmission path between them, and are connected to each slave station. In the data transmission device that controls the controlled device by the master station, only when the master station polls each slave station for the first time, the waiting time for receiving response data from each slave station is extended to a time that is much longer than usual. In advance, the master station can receive a plurality of response data from each slave station, and the result can be recorded in the memory area in the master station.
In each slave station, only when the master station polls for the first time, the time from receiving the address addressed to itself to sending the response data is created by the random function generating means in the own station, and the response time is set accordingly. A data transmission device characterized in that response data is transmitted while waiting for a delay.