JPS63197143A - Multi-point communication system - Google Patents

Abstract

PURPOSE:To attain a communication from an optional slave station to a master station while using effectively a polling transmission line by using a polling transmission line from a master station and receiving a signal from a slave station during the interval of the polling transmission from the master station. CONSTITUTION:A master station transmission line connection means 141 connects a master station transmission means 121, and a polling transmission line 191, and connects a master station reception means 131 and a polling transmission line 191. A slave station communication command means 151 uses a slave station transmission means 161 to apply transmission by the communication instruction of the slave station or uses a slave station receiving means 171 to apply reception. A slave station transmission line connecting means 181 connects a slave station transmission means 161 and a polling transmission line 191 and connects a slave station reception means 171 and a polling transmission line 191. Thus, the reception from the slave station is applied at the interval of the polling transmission from the master station to use the polling transmission line 191 effectively to attain communication from an optional slave station to the master station.

Description

[Detailed Description of the Invention] [Table of Contents] Overview Industrial Field of Application Conventional Technology Problems to be Solved by the Invention Means for Solving the Problems Action Example ■, Correspondence between the Example and Figure 1 Relationship ■, Structure of the embodiment ■, Operation of the embodiment (i) Operation of the master station (ii) Operation of the slave station ■, Summary of the embodiment ■0 Variations of the invention Effects of the invention [Summary] Multi-point communication system When polling is performed between a master station and multiple connected slave stations, the polling transmission path from the master station is used to receive data from the slave stations between polling transmissions from the master station. By doing so, it is possible to effectively use the polling transmission path to perform communication from any slave station to the master station.

[Industrial application field]

The present invention relates to a multipoint communication system, and more particularly, to a polling multipoint communication system used in a bank, for example, between a master station and each branch connected in full duplex.

[Conventional technology]

Data can be transmitted and received simultaneously between a master station and a slave station connected in full duplex. FIG. 6 shows the configuration of a full-duplex multipoint system.

In FIG. 6, a master station 610 has n slave stations a691, b693, . ..., connected to slave station n699 by line. rRJ of the master station 610 and n slave stations represents a receiving end, and rsJ represents a transmitting end.

Polling from the master station 610 is performed at the transmitting end r of the master station 610.
It is transmitted from SJ and received at the receiving end rRJ of the slave station. In addition, the polling response from the slave station is sent from the transmitter terminal r of the slave station.
It is transmitted from SJ and received at the receiving end rRJ of master station 610.

FIG. 7 is a timing diagram of polling from the master station 610.

First, the master station 610 polls the slave station a 691 by transmitting 1 polling a'' (polling a is the identification data and transmission request data of the slave station a 691) from the transmission terminal rSJ of the master station 610. At station a691, “
When the receiving end rRJ receives "polling a", it determines that it is a transmission request to its own terminal, and sends "polling a" from the transmitting end rSJ.
Polling response a′″ (Polling response a is the slave station a6
91 identification data and response data). Note that slave stations other than slave station a691 also receive "polling a", but each slave station ignores it because it is not polling for its own station.

The master station 610 sends the 'polling response a' to the receiving end rRJ.
When the master station 610 receives the data, the master station 610 next polls the slave station b693.
"Polling b'" is sent from the sending end rSJ of slave station b.
The reception is received at the receiving end rRJ of 693. And slave station b69
The "polling response b" is transmitted from the transmitting end rSJ of No. 3, and is received by the receiving end rRJ of the master station 610.

Thereafter, all slave stations up to slave station n699 are polled in the same manner.

However, in the above method, the transmission path for polling from the master station 610 to the slave stations is used only for polling transmission, so it is not used effectively when polling responses are being received. . Another disadvantage is that the polling cycle becomes longer in proportion to the number of slave stations, and it takes time for emergency communication (for example, when an abnormality occurs) from slave stations other than the slave station currently polling.

As a method to solve the drawback that the polling cycle is long and emergency contact takes time, Japanese Patent Application Laid-Open No. 58-15114
There is a publication No. 6 ``Remote monitoring method''.

FIG. 8 is a timing diagram of this "remote monitoring method".

The configuration of the communication system is shown in Figure 6, with slave station a
An abnormality occurs in the slave station p (not shown) while making a polling response from 691 or while polling the slave station b693, and the problem is reported to the master station 6.
10 shall be contacted.

In FIG. 8, the timing at which a corresponding slave station starts transmitting a polling response in response to polling from a master station 610 is delayed by a predetermined period of time. The slave station p transmits a polling request to the master station 610 during this delay time t. After receiving the polling response from the slave station b 693, the master station 610 interrupts normal polling and polls the slave station p. In this way, any emergency contact from any slave station is received. can be received.

[Problem that the invention seeks to solve]

By the way, in the conventional method described above, the drawback that emergency contact takes time can be solved, but since the transmission path for polling is used only for sending polling, when sending a polling response, The problem was that it was not being used effectively.

The present invention was created in view of these points, and provides a multi-point communication method that enables communication from any slave station to a master station by effectively using a polling transmission path. is intended to provide.

[Means for solving problems]

FIG. 1 is a principle block diagram of the multipoint communication system of the present invention.

In the figure, a master station communication instruction means 111 instructs the master station to communicate in a multipoint communication system in which the master station polls a plurality of slave stations.

The master station transmitting means 121 receives instructions from the master station communication instructing means 111 and performs a transmitting operation to the slave stations.

The master station reception means 131 receives instructions from the master station communication instruction means 111 and performs a reception operation for the slave station.

The master station transmission line connecting means 141 connects the master station transmitting means 121 and the polling transmission line 191 and the master station receiving means 131 and the polling transmission line 191.

The slave station transmitting means 161 instructs the slave stations to communicate.

The slave station transmitting means 161 receives instructions from the slave station communication instructing means 151 and performs a transmitting operation to the master station.

The slave station reception means 171 receives instructions from the slave station communication instruction means 151 and performs a reception operation for the master station.

The slave station transmission line connecting means 181 connects the slave station transmitting means 161 and the polling transmission line 191 and the slave station receiving means 171 and the polling transmission line 191.

Therefore, as a whole, the polling transmission path 19 from the master station
1 to perform transmission and reception operations.

[For production]

The master station communication instruction means 111 instructs the master station to communicate.

Accordingly, the master station transmitting means 121 performs a transmitting operation, or the master station receiving means 131 performs a receiving operation.

The master station transmission line connecting means 141 connects the master station transmitting means 121 and the polling transmission line 191 and the master station receiving means 131 and the polling transmission line 191.

The slave station communication instruction means 151 instructs the slave station to communicate.

Accordingly, the slave station transmitting means 161 performs a transmitting operation, or the slave station receiving means 171 performs a receiving operation.

The slave station transmission line connecting means 181 connects the slave station transmitting means 161 and the polling transmission line 191 and the slave station receiving means 171 and the polling transmission line 191.

In the present invention, by performing reception from the slave station between polling transmissions from the master station, it is possible to effectively use the polling transmission path 191 to perform communication from any slave station to the master station. can.

(Example) Hereinafter, an example of the present invention will be described in detail based on the drawings.

FIG. 2 shows the configuration of a multipoint communication system in an embodiment of the present invention.

1 with ■, and l. Here, the correspondence between the embodiment of the present invention and FIG. 1 will be shown.

The master station communication instruction means 111 corresponds to the main control section 211.

The master station transmitting means 121 corresponds to the transmitting section 221.

The master station receiving means 131 includes the receiving section 231. It corresponds to the memory 233.

The master station transmission path connection means 141 corresponds to a connection point between the transmission path from the master station, the master station transmission path 291, and the transmitter 221 and receiver 231.

The slave station communication instruction means 151 includes a main control unit 251° timer 2
It corresponds to 53.

The slave station transmitting means 161 includes a transmitting section '261. This corresponds to the detailed information buffer 263.

The slave station receiving means 171 includes a receiving section 271. Message buffer 2
It corresponds to 73.

The slave station transmission path connecting means 181 corresponds to a connection point between the transmission path from the master station, the master station transmission path 291, and the transmitter 261 and receiver 271.

The polling transmission path 191 corresponds to the master station transmission path 291.

II. Assuming that there is a correspondence relationship such as (λ1 or more), embodiments of the present invention will be described below.

The overall configuration of the multi-point system of the embodiment is shown in FIG. 6. In FIG. The receiving end rRJ of is connected to the transmitting end rSJ of each slave station.

FIG. 2 shows details of the master station 610 and slave station a691.

It is assumed that the other slave stations also have the same configuration as slave station a691.

In the figure, the master station 610 includes a main control section 211 . A polling generator 213 that creates a polling signal. Transmitter 221 that performs polling transmission
．． A receiving unit 231 and a receiving unit 239 that receive data from a slave station. A memory 233 for storing data received by the receiving unit 231. It consists of an interface 245 for connecting to a host computer.

The above components other than the main control unit 211 are the main control unit 211
is connected to. Further, the polling generating section 213 and the transmitting section 221 are connected, and the memory 233 and the receiving section 2
31 is connected. Furthermore, the transmitter 221 and the receiver 2
31 is connected to a master station transmission path 291.

Similarly, the slave station a691 has a main control unit 251. which controls the entire slave station a691. Memory 269 for storing transmission information for polling responses. A transmission register 267 temporarily stores the transmission data stored in the memory 269, and a transmission section 265 transmits the data in the transmission register 267 to the master station 610.
．． OR gate 255 that sends a transmission instruction to transmission section 265. Receiving unit 271 that receives polling. Message buffer 273 for temporarily storing polling contents. A polling determination unit 252 that determines the content of polling. Detailed information buffer 263 for storing failure information. The transmission instruction is sent to the transmitter 261. AND gate 259 to send to OR gate 255. flag 25
7. It is composed of a timer 253.

The main control unit 251 has a memory 269. Transmission register 267
, interface 285. Timer 253, receiving section 27
1. Message buffer 273. Polling determination unit 252. Flag 257. It is connected to the detailed information buffer 263. An instruction signal from the main control section 251 is input to a flag 257, and the flag 257 is input to one input terminal of an AND gate 259. The instruction signal from the polling determination section 252 is input to the other input terminal of the AND gate 259,
The output of the AND gate 259 is input to the transmitter 261 and one input terminal of the OR gate 255. or gate 25
An instruction signal from the main control section 251 is input to the other input terminal of the OR gate 255, and the output of the OR gate 255 is input to the transmission section 265.

The transmission register 267 and the transmission section 265 are connected,
A receiving unit 271 and a message buffer 273 are connected.

Further, the transmitter 261 and the detailed information buffer 263 are connected, and the transmitter 261 and the receiver 271 are further connected to the master station transmission path 291.

FIG. 3 is an explanatory diagram of the operation of the master station 610. Also, the fourth
The figure is an explanatory diagram of the operation of the slave station, and FIG. 5 is a polling timing diagram.

Hereinafter, FIGS. 2 to 6 will be referred to.

Now, in response to polling from the master station 610, the timing at which a corresponding slave station starts sending a polling response is delayed by a predetermined period of time, and if a failure occurs in a slave station other than the slave station currently polling, Consider a case where failure information is transmitted using the master station transmission path 291 and the master station reception path 293.

The operation of the master station 610 and the operation of the slave station will be explained separately.

``Uni'' υj to 11 FIG. 3(a) shows the flow of operations for polling transmission in the master station 610 and polling response reception from the slave station. Further, FIG. 3(b) shows the flow of operations for polling transmission in the master station 610 and failure information reception from the slave stations. still,
The polling transmission (step 311) in FIG. 3(a) and the polling transmission (step 311) in FIG. 3(b) show the same operation in the master station 610.

Main control section 211 of master station 610 sends an instruction to polling generation section 213 to perform polling. The polling generator 213 creates slave station identification data and transmission request data for polling, and inputs them to the main controller 211. The transmitter 221 transmits the data created by the polling generator 213 under the control of the main controller 211 to the transmitter rSJ.
(Step 311).

The corresponding slave station receives polling from the master station 610 and returns a polling response, and in the master station 610, the receiving unit 239 receives the polling response via the receiving end rRJ (step 312).

The polling response received by the receiving unit 239 is sent to the main control unit 2.
11 to the host computer (not shown) via the interface 245 (step 3
13).

Thereafter, the main control unit 211 repeats polling transmission (step 311), polling response reception (step 312), and transfer (step 313) to the next slave station.

The main control unit 211 performs the following failure information receiving operation in parallel with the normal polling operation described above.

The main control unit 211 transmits polling from the transmitting unit 221 (
After step 311), it is determined whether the receiver 239 has received an emergency code from the slave station where the failure has occurred (step 321). If no emergency code has been received, a negative judgment is made and normal polling transmission is performed (step 311).
repeat.

If a failure occurs in any slave station (for example, slave station n699),
When the receiving unit 239 receives the emergency code from the slave station, an affirmative determination is made in step 321 as to whether or not the emergency code has been received, and the emergency code is sent to the host via the interface 245 under the control of the main control unit 211. Transfer to a computer (step 322).

Next, detailed information is sent to the receiving unit 23 via the master station transmission path 291.
1 (step 323). The received information is stored in memory 233 (step 324). Note that since the emergency code is received via the master station reception path 293 and the detailed information is received via the master station transmission path 291, step 321
In parallel with the emergency code reception determination in step 322 and the data transfer in step 322, detailed information reception in step 323 can be performed.

The main control unit 211 reads detailed information stored in the memory 233 and transfers it to the host computer via the interface 245 (step 325).

Thereafter, the process from polling transmission (step 311) to detailed information transfer (step 325) is repeated for each slave station.

] When an interrupt occurs in the main control unit 251, the 1 Yuyorito 1 Sakuko station
Interrupts to the main control unit 251 that perform operations in response to interrupts include a polling interrupt when polling is received from the master station 610, and a transmission from a terminal device (not shown) connected to a slave station. Consider terminal interrupts when data is sent, and fault interrupts when a fault occurs in the terminal device or the slave station itself.

First, the main control unit 251 determines whether or not there is an interrupt (step 411). If there is no interrupt, a negative determination is made, and the determination of whether or not there is an interrupt is repeated until an interrupt occurs.

When an interrupt occurs in the main control unit 251, step 411
After making an affirmative determination in step 412, it is then determined whether the interrupt is a terminal interrupt.

If it is a terminal interrupt, an affirmative determination is made and the polling response data from the terminal is stored in the memory 269 via the interface 285 (step 413). memory 26
9, the operations after the interrupt determination in step 41'1 are repeated.

If an interrupt occurs and it is not a terminal interrupt, a negative determination is made in step 412, and then it is determined whether or not it is a failure interrupt (step 414).

If it is a failure interrupt, an affirmative judgment is made and the flag 257 is set to “
1” (step 415).

The flag 257 value is input to one of the two inputs of AND gate 259. Note that the transmitter 261. It is assumed that the transmitter 265 starts a transmitting operation when "l" is input as a transmitting instruction.

Next, the main control unit 251 stores an emergency code that notifies the master station 610 of the occurrence of a failure in the transmission register 267 (step 416), and stores detailed information on the failure (slave station identification code, failure type code, etc.) in the detailed information buffer 263. is stored (step 417). Similarly, detailed information on the failure is stored in the memory 269 (step 418). When data storage in the memory 269 is completed, the operations after the interrupt determination in step 411 are repeated.

If the generated interrupt is a polling interrupt, step 412 determines whether or not it is a terminal interrupt; step 4;
14 is a negative determination, and then the timer 253 is activated (step 419).

Then, the polling data received from the master station 610 by the receiving unit 271 is transferred to the message buffer 273 (
step 420). The polling determination unit 252 analyzes the data stored in the message buffer 273 (step 421), and determines whether the polling is directed to the own station (step 422).

If the poll is directed to your own station, make a positive judgment, and then
It is determined whether the transmission data is already stored in the memory 269 (step 423).

If data storage in the memory 269 at the time of a terminal interrupt (step 413) or data storage in the memory 269 at the time of a failure interrupt (step 418) has already been executed, an affirmative determination is made in step 423, and the storage is performed. Transfer data to transmit register 267 (step 4
24). If no data is stored, a negative judgment is made and a code indicating that there is no data is sent to the transmit register 2.
67 (step 425).

Next, the main control unit 251 determines whether or not the timer 253 has exceeded a predetermined time (delay time) (step 426).
If the predetermined time has not yet been reached, a negative determination is made and the determination in step 426 is repeated until the predetermined time has been reached.

When the timer 253 exceeds the predetermined time, an affirmative determination is made in step 426, and "1" for a transmission instruction is input to one input terminal of the OR gate 255 (step 427).

The OR gate 255 outputs 1 when "1" is input. When the transmission instruction "1" from the OR gate 255 is input, the transmission unit 265 reads the data stored in the transmission register 267 and transmits it from the transmission end rsJ to the master station 610 via the master station reception path 293 ( Step 42
8).

Polling when polling is for another slave station.

The determination unit 252 makes a negative determination as to whether or not the polling is directed to the local station (step 422), and then determines whether the reception of the polling data has been completed (step 429). If it is not finished, make a negative judgment,
Step 429 is repeated until the reception is completed.

When the reception of the polling data is completed, an affirmative determination is made in step 429, and then the polling determination unit 252 inputs a transmission instruction "1" to the AND gate 259 (step 430).

The subsequent operation branches depending on whether the input (value of flag 257) to the other input terminal (input of value of flag 257) of AND gate 259 is 10'' or 1'' (step 431).

Normally (if no failure has occurred), step 415
Since the flag 257 has not been sent at step 257, "0" is input to the other input terminal of AND gate 259. In this case, the operations after the interrupt determination in step 411 are repeated.

When a failure occurs, flag 257 is set in step 415.
is set, ``1'' is input to the other input terminal of the AND gate 259.

In this case, the AND gate 259 outputs a transmission instruction “1”. The output instruction is input to the transmitter 261° OR gate 255. In OR gate 255, output instruction "
1” and inputs a transmission instruction to the transmission section 265 (
Step 432).

The transmitting unit 265 transmits the emergency code stored in the transmitting register 267 (already stored in step 416) from the transmitting end “S” (step 433), and the transmitting unit 261 transmits the detailed information stored in the detailed information buffer 263 (step 433). Step 417
) is transmitted from the receiving end rRJ (step 43).
4).

When the transmission of the fault data in steps 433 and 434 is completed, the main control unit 251 repeats the operations after the interrupt determination in step 411.

FIG. 5 shows the timing when a failure occurs in slave station n699 while polling from master station 610 to slave station a691.The polling order is as follows:
Since the next station after 91 is slave station b693, after receiving the polling for slave station b693, slave station n699 sends the emergency code via the master station receiving path 293 and the detailed information via the master station transmitting path 291. Send.

■, Stop As described above, when a failure occurs in any slave station, an emergency code is transmitted from the transmitter 265 of the slave station to the receiver 239 of the master station 610 via the master station reception path 293, and the detailed Information is transmitted from the transmitter 261 of the slave station to the receiver 231 of the master station 610 via the master station transmission path 291.

Therefore, communication to the master station 610 can be performed by effectively using the master station transmission path 291.

■, no.

In the embodiment of the present invention described above, a delay time is set between polling and a polling response, and the emergency code is transmitted to the master station receiving path 293 using that time. It is also possible to transmit the emergency code from the master station transmission path 291 prior to transmitting the detailed information without setting it.

In addition, in "I. Correspondence between Examples and FIG. 1",
Although the correspondence between FIG. 1 and the present invention has been described, those skilled in the art can easily guess that the present invention is not limited to this and that there are various variations B.

〔Effect of the invention〕

As described above, according to the present invention, reception from the slave station can be performed between polling transmissions from the master station using the polling transmission path from the master station, so it is extremely useful in practice. be.

[Brief explanation of the drawing]

Fig. 1 is a principle block diagram of the multipoint communication system of the present invention, Fig. 2 is a block diagram of the configuration of a master station and a slave station of an embodiment to which the multipoint communication system of the present invention is applied, and Fig. 3 is a block diagram of the structure of a master station and a slave station of an embodiment to which the multipoint communication system of the present invention is applied. 4 is an explanatory diagram of the operation of the slave station in the embodiment of the present invention, FIG. 5 is a timing diagram of the embodiment of the present invention, and FIG. 6 is an explanatory diagram of the operation of the slave station in the embodiment of the present invention. Communication system configuration diagram,
FIG. 7 is a timing diagram of the conventional example, and FIG. 8 is a timing diagram of the conventional example. In the figure, 111 is a master station communication instruction means, 121 is a master station transmission means, 131 is a master station reception means, 141 is a master station transmission line connection means, 151 is a slave station communication instruction means, 161 is a slave station transmission means, 171 is a slave station receiving means, 181 is a slave station transmission line connecting means, 191 is a polling transmission line, 211.251 is a main control unit, 213 is a polling generating unit, 221.261.265 is a transmitting unit, 231.239.271 is a Receiving unit, 233 is memory, 245.285 is interface, 252 is polling determination unit, 253 is timer, 255 is OR gate, 257 is flag, 259 is AND gate, 263 is detailed information buffer, 267 is transmitting register, 269 is memory , 273 is a message buffer, 291 is a master station transmission path, 293 is a master station reception path, 610 is a master station, 691 is a slave station a1, 693 is a slave station b1, and 699 is a slave station n. Book 158 9. Figure 1 (8) (b) Aoi Kashu 10) Hammer bottle 0 movement diagram Figure 3

Claims (1)

[Claims] In a multipoint communication system in which a master station polls a plurality of slave stations, a master station communication instructing means (111) instructs the master station to communicate; and an instruction for the master station communication instructing means (111). a master station transmitting means (121) that performs a transmitting operation to the slave station in response to the instruction, and a master station receiving means (131) that performs a receiving operation to the slave station in response to an instruction from the master station communication instruction means (111); Master station transmission means (121) and polling transmission path (191)
and a master station receiving means (131) and a polling transmission path (19).
1); a slave station communication instruction means (151) for instructing the slave station to communicate; A slave station transmitting means (161) that performs a transmitting operation; a slave station receiving means (171) that performs a receiving operation for the master station upon receiving instructions from the slave station communication instruction means (151); and a slave station transmitting means (161). and polling transmission path (191)
and slave station receiving means (171) and polling transmission path (19)
1), and a slave station transmission path connection means (181) for connecting the main station, and is configured to perform transmission and reception operations using a polling transmission path (191) from the master station. Point communication method.