JPH0319544A - Loop form mutual communication equipment - Google Patents

Abstract

PURPOSE:To attain communication in the virtual wiring state by allowing a mutual communication equipment passing simply through a serial signal to apply mutual communication between two mutual communication equipments of the same address of one and same loop when reception address information and a setting address are not equal. CONSTITUTION:A transmission format consists of synchronizing information, address information, data information and an ACK bit to confirm the operation of a mutual communication equipment. The mutual communication equipment communicating mutually is provided with a reception ACK detection circuit 7 detecting the operating condition to store data information in a received data through serial/parallel conversion when an ACK bit in a reception signal is logical 1 and a setting address and a reception address are equal to each other, and a transmission ACK bit generating circuit 8 to confirm it that the mutual communication equipment applies input/output operation normally. Thus, the wiring is regarded simply coupled without considering the communication protocol and simple communication is attained.

Description

DETAILED DESCRIPTION OF THE INVENTION FIELD OF INDUSTRIAL APPLICATION The present invention relates to intercommunication of communication devices having a loop shape.

BACKGROUND OF THE INVENTION In recent years, automatic machines have become more sophisticated through the use of microprocessors, and it is now not uncommon for automatic machines to be equipped with hundreds of sensors, actuators, etc.

In view of the above, the present applicant has filed Japanese Patent Application No. 61-165830 for a data transmission device capable of performing high-speed data transmission to a plurality of slave stations connected in a loop.

In this prior art, as shown in FIGS. 15 and 16, an address match detection storage circuit C detects a match between a preset address and address information in a transmission signal (FIG. 16(a)). By doing so, a transmission signal (Fig. 16 (C)) in which data information is replaced with serial data (Fig. 16 (b)) converted from parallel input data by a parallel-to-serial converter d is transmitted. The address setting at the station is performed by setting the address setting switch A of the address coincidence detection storage circuit C.

Furthermore, as shown in Figure 14, as a method that has been widely used for group management of various terminals, a host computer is connected to a terminal by installing a number of changeover switches called multiplexers (MUX) between the terminals. We are having an exchange.

Problems to be Solved by the Invention However, when performing mutual communication in the above conventional example, input/output is performed basically if the addresses match in the conventional example, so the addresses of two slave stations in the same loop are If they are made the same, data can be sent from the upstream slave station to the downstream slave station, but the reverse is not possible.

Furthermore, when trying to communicate between terminals using the device shown in Figure 14, it is necessary to exchange each piece of data once with the host computer, then switch the MUX and exchange signals between the host computer and another terminal again. However, not only is the hardware configuration and software complex, but there are also problems in that it lacks real-time performance and takes too much time to transmit data.

In view of the above-mentioned problems, the present invention provides a loop-like mutual communication device that allows slave stations set at the same address on the same loop to communicate in a so-called virtual wiring state in which the wires are simply connected without being aware of communication. The purpose is to provide

Means for Solving the Problems In order to achieve the above object, the loop-shaped mutual communication device of the first aspect of the present invention uses synchronization information, address information, and data information to indicate that the loop-shaped mutual communication device is operating normally. Generates a serial signal consisting of the ACK bit to confirm, 1
A loop controller that sets the ACK bit to 0 during the first transmission, and transmits the data information and ACK bit received the first time as they are during the second transmission, and a loop controller that sets the ACK bit in the serial signal transmitted from the loop controller to If the received address information is equal to the preset setting address and the ACK bit is 1, the data information is replaced with serialized input data, the received data information is parallelized and output, and the ACK bit is set. 1
If the ACK bit is 0, the ACK bit is set to 1 and transmitted. On the other hand, if the received address information and the preset address are not equal, the serial signal is simply passed through. The present invention is characterized in that two mutual communication devices set to the same address in the same loop form communicate with each other.

In addition to the first aspect, the loop-shaped mutual communication device according to the second aspect of the present invention changes the set address of its own station to the destination address in response to a transmission start command of a communication signal such as RS232C, and receives a reception ACK. The present invention is characterized in that after detecting that the signal is O continuously, the communication signal such as the RS232C is used as input/output data, and is transmitted and received as a serial signal of the mutual communication device.

Effects According to the first aspect of the present invention, communication between transmission devices set at the same address can be performed regardless of the direction of signal flow within the same loop, and furthermore, according to the present invention, communication can be performed between transmission devices set at the same address, and furthermore, according to the patent application filed by the present applicant in 1983, By combining this with the extremely small delay time, which is a feature of the transmission device of No. 165830, it is possible to perform mutual communication at extremely high speed, and in some cases, it can be regarded as a simple wiring, making it easy to handle.

Furthermore, according to the second aspect of the present invention, since it can be regarded as a simple wiring as described above, a serial signal such as RS232C, which is a general communication standard for personal computers, etc., can be directly used as input/output data to any terminal on the same harp. You can easily send and receive data to and from stations in real time.

Embodiment An embodiment of the present invention will be explained based on FIGS. 1 to 8.

As shown in FIG. 3, the transmission format used in this embodiment consists of synchronization information, address information, data information, and an ACK bit for confirming that the intercommunication device has operated.

As shown in FIG. 2, the loop controller that generates such a transmission signal includes an address counter 1 for scanning address information in descending or ascending directions, and a parallel/serial converter 2 for converting the transmission signal. A transmission carrier and timing generation circuit 3 for generating data from a serial/parallel converter 4 converts the received signal into serial/parallel data, and transmits second scan data information and ACK bit information to the parallel/serial converter 2. The reception carrier and timing generation circuit 5 for generating information, and the AC of the first scan in the same address information.
It is composed of a gate 6 that sets the K bit to O and makes the ACK bit of the second scan the same as the received ACK bit information.

On the other hand, as shown in FIG. 1, when the ACK bit in the received signal is 1 and the set address and the received address are equal, the mutual communication devices that communicate with each other serially convert the data information in the received data. It consists of a reception ACK detection circuit 7 that detects operating conditions for parallel conversion and storage, and a transmission ACK bit generation circuit 8 that confirms that the mutual communication device has performed normal input/output operations.

Next, the operation of the above embodiment will be explained using FIGS. 4 to 7. Here, Fig. 4 shows the flow of information during mutual communication, Fig. 5 shows the operation flow, and Fig. 6 shows the flow of information up to the time of address matching, and the ACK bit (
FIG. 7 shows the actual operation when the received ACK bit (hereinafter referred to as received ACK for short) is 0. FIG. 7 shows the operation when the received ACK bit is 1 when the address matches. Note that #1 to #8 in FIGS. 4 and 5 correspond to signal flows and operation flows, and ■ to ■ indicate transmission signals.

First of all, synchronization information is sent from the loop controller 9 as shown in ■.
Address information n=100, undefined data information and ACK
Transmits a transmission signal such as bit O in FIG. 6 (a+).Next, in the mutual communication device 1 in FIG. 4, in #2 in FIG. =O, so proceed to #4 and only input B and do not output.This series of waveforms transmits a transmission signal like ■ by setting the ACK bit to be transmitted next (hereinafter abbreviated as transmission ΔACK) to 1. is shown in Figure 6.

Next, when reaching mutual communication device 2, the process returns to #2 as shown by the broken line in Figure 5, and since the addresses do not match in #2, the contents of the transmission signal are not changed as in #8. is then sent to the next intercommunication device 3. Here, in addition to the address match, the received ACK is 1 as shown in fa) in Figure 7, so #5
Perform input/output operations like ``rl!'' to the mutual communication device. The input data C=OO11 of t3 is input and replaced with data information, and the data B=1000 input by the mutual communication device 1 is output. This series of waveforms is shown in FIG. Here, the new data B=1000 is stored (latched) as the address match signal (dl and ACK bit=1 is detected, so an output latch pulse tel is generated and ff).

Next, the transmission signal {circle around (2)} transmitted from the intercommunication device 3 is transmitted to the intercommunication device 1 by the loop controller 9, which copies or passes the data information and ACK bit information as is, and transmits a transmission signal such as ■ to the intercommunication device 1 again.

Here, the address remains n for the second scan as well. In the mutual communication device 1, since the received ACK bit=1 this time, data C=OO11 is output. Here, the mutual communication devices W1.3 having the same setting address can exchange data B and C with each other. Note that the mutual communication device 1 transmits a transmission signal such as (2), but the subsequent operation is the same as that described above, so a detailed explanation will be omitted.

By the way, when the loop controller 9 receives the second scan transmission signal ■ of address n, it increments the address by n+1, sets the ACK bit to 0, and transmits a transmission signal such as ■. The subsequent operations are the same as those described above for address n, so the explanation will be omitted.

Note that in the above description, the address n is incremented, but the same applies if it is decremented. Also, synchronization information length, data length, address length and AC
The K bit length may be any length. Also, logic is positive logic,
Either negative logic is fine. Furthermore, it does not matter how many mutual communication devices there are in the same loop. In addition, in the above explanation, we have explained the case where the loop controller copies and transmits the received data and received ACK in the second scan of the same address as shown in Fig. The same effect can be obtained by incrementing or decrementing the address counter and using the second scan as re-serial input data to the shift register 10 to allow the second scan transmission signal to pass through.

Next, a second embodiment of the present invention will be described using FIGS. 9 to 13. Here, FIG. 9 shows a communication standard widely used in bankcon communications and the like. FIG. 10 shows the transmission transmission format in the above case, and FIG. 11 shows the reception transmission format of the mutual communication device when transmitting RS232C communication signals. Also, FIGS. 12 and 13 show the RS232C transmission procedure for controlling the mutual communication device in FIG.
and the flow of the transmission procedure.

The transmission transmission format of FIG. 10 used in this embodiment is an application example of FIG. 3, with address information A3 to AO and RS232C transmission data information T as parallel input data.
X D (Transo+ission Data)
,DTR (Data Terminal Rea
dy), RTS(Request To Se
nd) and an ACK bit. On the other hand, the reception transmission format shown in Fig. 11 is RXD (Receiving Data) as parallel output data of data information.
, DSR (Data Set Ready)
, and CTS (Clear To Send) as RS232C serial signals. Although most RS232C communications are satisfied with these 3-bit data information, it is also possible to simply use only TXD and RXD.

The mutual communication device of this embodiment that mutually communicates such transmission signals is a loop RS232C control device that detects when the line is open using RS232C signals and controls the mutual communication, as shown in FIG. 11 is added to the l-th mutual communication device in the first embodiment.

Note that the loop controller may be the same as that shown in FIG.

Next, the operation will be explained. First, a transmission request command as shown in Fig. 12 for controlling the mutual communication device shown in Fig. 9 is sent from a personal computer etc. that transmits an RS232C signal to the
32C or other input/output device. The loop RS232C control device 11 receives this transmission request at #9 in FIG. 13 and changes the slave station address previously set in the low station to the address of the destination as shown at #10.

Next, as shown in #11, when the received ACK bits are continuously 0, it is detected that the line is open. Next, as in #12, if the addresses in the transmission signals match from then on, mutual communication begins by performing the operations described in the first invention. To end the RS232C communication, the RS2
From a personal computer or the like transmitting a 32C signal, the transmission signal command shown in FIG. 12 is sent to the loop RS232C control device 11.
It is decoded as shown in #13 and returned to its own address as shown in #14. A series of abnormal operations allows any RS232C cable connected to a number of mutual communication devices as shown in FIG. 9 on the same loop to communicate with each other.

Next, the response time will be calculated.As a condition for achieving a low-cost configuration, it is assumed that the transmission format is an 8-bit structure as shown in FIGS. 10 and 11, and 16 types of mutual communication are performed with one lube. Transmission speed that can be achieved inexpensively with optical communication2
0Mbps, adding 8 bits of error processing code and increasing the transmission length of one frame to 16. If the stop bit is 4 bits, one time slot has a 20 Mbps pulse width of 25 ns, so 25 ns 16μsec By the way, according to the sampling theorem, a signal with a pulse width more than twice that of 16μsec can be transmitted, so 32μsec=
Communication of 16 lines of serial signals up to 16KHz is possible in real time.

Although RS232C is used as an example in this embodiment, other communication methods such as Centronx RS422 may be used.

Effects of the Invention According to the present invention, any two communication devices in the same loop can input and output each other, so when scanning at high speed, it can be assumed that the wires are simply connected without considering any communication procedure. , and can communicate easily. By simply adding a send request and three destination commands as software, you can communicate in real time without having to consider the hardware configuration at all.
It has a great effect.

[Brief explanation of the drawing]

1 to 8 show the first embodiment of the present invention, FIG. 1 is a configuration diagram of a mutual communication device that communicates with each other, FIG. 2 is a configuration diagram of a loop controller, and FIG. 3 is a transmission diagram. Explanatory diagram of the format, Figure 4 is a signal flow diagram, Figure 5 is an operation flow diagram, Figure 6 is a diagram of the operation flow.
The figure is a signal diagram when the ACK bit is “0”, and Figure 7 is the signal diagram when the ACK bit is “0”.
A signal diagram at the time of bit rlJ, FIG. 8 is another configuration diagram of the loop controller, FIGS. 9 to 14 show a second embodiment of the present invention, and FIG. 9 is a configuration diagram of the mutual communication device. Fig. 10 is an explanatory diagram of the transmitted signal format, Fig. 11 is an explanatory diagram of the received signal format, Fig. 12 is an explanatory diagram of communication protocols such as RS232C, Fig. 13 is an operation flow diagram, and Fig. 14 is an explanatory diagram of the conventional example. A schematic configuration diagram, FIG. 15 is a configuration diagram of a prior art transmission device, and FIG. 16 is a waveform diagram of each signal. 1...address counter, 7...reception ACK generation circuit, 8...transmission ACK detection circuit,
9... Lube controller, 11... Loop RS232C control device.

Claims (2)

[Claims] (1) AC that confirms that synchronization information, address information, data information, and the same loop-shaped mutual communication device are operating normally.
a loop controller that generates a serial signal consisting of K bits, sets the ACK bit to 0 during the first transmission, and transmits the data information and the ACK bit received the first time as they are during the second transmission; and the loop controller. Detects the ACK bit in the serial signal sent from the serial signal, and if the received address information and the preset setting address are equal and the ACK bit is 1, the data information is replaced with serialized input data, and the received data is The information is parallelized and output, and the ACK bit is sent as 1, and if the ACK bit is 0, it is not output and A
Two signals set to the same address on the same loop are transmitted with the CK bit set to 1, and on the other hand, when the received address information and the preset setting address are not equal, the serial signal is simply passed through. A loop-shaped mutual communication device characterized in that mutual communication devices perform mutual communication. (2) In the mutual communication device of the loop-shaped mutual communication device according to claim 1, the set address of the own station is changed to the address of the destination by a command to start transmitting a communication signal such as RS232C, and the received ACK signal is continuously transmitted. After detecting that the signal is 0, the communication signal such as the RS232C is used as input/output data,
A loop-shaped mutual communication device, characterized in that the mutual communication device transmits and receives serial signals.