JPS63275237A - Serial data coupling method - Google Patents

Abstract

PURPOSE:To realize a unit connection with abundant flexibility by cascade-connecting optional number of pieces of devices to be controlled by using a pair of serial data communication lines, and discriminating automatically functions of the respective devices to be controlled at a control device side, and performing selectively the exchange of the data between the prescribed device to be controlled. CONSTITUTION:The plural devices to be controlled 21-2n are cascade-connected to the control device 1 by one pair of the serial data communication lines l1, l2. Then, at the time of the switch-on of a power supply, serial numbers, corresponding to the respective devices to be controlled 21-2n are allocated to them from the device to be controlled, near to the control device 1, through the serial data communication lines l1, l2, and at the same time, the control device 1 is made to recognize the functions of the respective devices to be controlled 21-2n, by reading out the function codes of the devices to be controlled 21-2n. Hereafter, the data exchange between the control device 1 and the respective devices to be controlled 21-2n is performed by using the data with the serial number. Thus, the provision of transmission reception circuits, the number of pieces of which corresponds to the number of pieces of the I/O units of the device to be controlled side, is unnecessary.

Description

Detailed Description of the Invention [Industrial Field of Application] The present invention provides communication between a control device (e.g., microcomputer, NC, etc.) and a plurality of controlled devices (e.g., various I10 units, etc.) via a pair of serial data communication lines. The present invention relates to a serial data combining method that allows serial data to be exchanged with a microcomputer (such as a microcomputer).

[Conventional technology]

FIG. 4 shows a control device 1' and a plurality of controlled devices (for example, I10 unit) 21' to 24' according to the prior art.
This is an example of the overall configuration when serial data is exchanged between the controller 1' and the controller 11'. A predetermined bit of command data is supplied to a transmitting/receiving circuit (for example, 121') corresponding to the address, the predetermined bit of command data is converted from parallel to serial within the transmitting/receiving circuit, and the converted serial data is converted to the transmitting/receiving circuit 121'. The signal is selectively supplied from the address to the I10 unit 21' corresponding to the address via the corresponding communication line. The serial data thus received by the I10 unit 21' is converted from serial to parallel in the I10 unit 21', and the parallel data is used to turn on and off the relays and hydraulic pumps provided in the I10 unit. or data of predetermined bits is taken into the microprocessor in the I10 unit. On the other hand, data sent by, for example, operating a switch provided on the external machine side is converted from parallel to serial in the corresponding I10 unit (for example, 21'), and the converted serial data is sent from the I10 unit 21'. The serial data is sent back to the corresponding transmitting/receiving circuit 121' via the corresponding communication line, and the returned serial data is sent back to the corresponding transmitting/receiving circuit 121'.
The signal is serial-parallel converted at 21' and taken into the microprocessor 11' on the control device 1' side.

[Problem that the invention seeks to solve]

However, when exchanging serial data using the above-mentioned conventional technology, it is necessary to provide transmitter/receiver circuits on the control device side in accordance with the number of I10 units on the controlled side, and there is a problem in that the physical quantity increases accordingly. .

[Means for Solving the Problem] The present invention has been made to solve the problem, and it connects a plurality of controlled devices to a control device in cascade through a pair of serial data communication lines, and At the time of power-on, each controlled device is assigned a serial number corresponding to the controlled device in order from the controlled device closest to the control device through the serial data communication line, and at the same time, the function code of the controlled device is read out. causing the control device to recognize the function;
A serial data coupling method is provided in which data with a serial number is used to exchange data between the control device and each controlled device.

[For production]

According to the above configuration, an arbitrary number of controlled devices can be connected in cascade to a pair of serial data communication lines, and the function of each controlled device can be automatically determined on the control device side when power is turned on. Therefore, data can be exchanged between the control device and the controlled devices by exchanging data with serial numbers corresponding to each controlled device.

〔Example〕

FIG. 1 is a diagram showing the overall configuration for carrying out a serial data combination method as an embodiment of the present invention. A transmitting circuit 12 that converts command data (instruction code) from parallel to serial, and a receiving circuit 13 that converts serial data returned from the controlled device (hereinafter simply referred to as I10 unit) side from serial to parallel are provided. A pair of serial data communication lines (transmission line E) are connected from the control device 1 via the transmission circuit 12 and the reception circuit 13, respectively.

and receiving line 22) extend from the pair of serial data communication lines 11 and ! , multiple I10 units 2
1 to 2n are connected in cascade.

Each I10 unit (eg 21) has the transmission line 7!1
A receiving circuit 211 for receiving predetermined serial data transmitted via the receiving line 12 and a transmitting circuit 212 for transmitting predetermined serial data to be returned to the control device side via the receiving line 12 are provided. . Each of the 110 units has a function code indicating its own function (for example, a relay, a hydraulic pump, an operation switch for a predetermined device, a servo unit, a memory unit, a microprocessor, etc.). (Function code sending circuit 2 shown in Figure 2)
15).

In such a system configuration, when the power is turned on,
Each 110 unit does not have a serial number, and the I10 unit 21 closest to the control bag W1 transfers the serial data from the control device 1 to the subsequent I10 unit (i.e., the next I10 unit or lower). ), the data passage section of the serial data transmission line Il is closed by a gate circuit 214, and all the gate circuits provided in the following 10 units are also closed.

In this state, when the control bag N1 first outputs a function code output command with a serial number (for example, 11kLL) as serial data to the serial data transmission line β1,
Only the I10 unit 21 closest to the control device receives this, holds the serial number as its own serial number, and then opens the gate circuit 214 to read the next serial number in the I10 unit 22 at the next stage. It is possible to receive a function code output command with a number (for example, 11m2).

On the other hand, the transmission circuit 212 of the I10 unit 21 outputs the function code data with the serial number (in this case, 鈥1) to the control device 1 as serial data to the serial data communication line I12.

FIG. 2 is a diagram showing the internal configuration of the I10 unit 21, and as described above, when the power is turned on, the receiving circuit 211
When receiving a function code output command with a serial number transmitted from the control device l, the receiving circuit 211
writes the serial number (for example, number 1) into the serial number register 216 (WE indicates a write enable signal), and also supplies the write enable signal WE to the flip-flop 217, so that the serial data communication line I!

A serial number setting completion signal GO for opening the AND gate 214 is supplied to the AND gate 214 (corresponding to the gate circuit 214 in FIG. 1) connected to the gate circuit 214 of the next stage.
Next serial number in unit 0 (e.g. Na2
) enables reception of function code output commands. Furthermore, a function code output command is supplied from the receiving circuit 211 to the transmitting circuit 212, and based on this, the transmitting circuit 212 outputs the serial number corresponding to its own I10 unit written in the serial number register 216. In addition, the function code held in the function code sending circuit 215 (code corresponding to the function of the I10 unit 21) is returned to the control bag Nl side via the OR circuit 213 connected to the serial data communication line β2. do.

In this way, the control device 1 receives the serial data returned from the I10 unit 21, confirms that the serial number of the I10 unit is, for example, "1", and then performs the function received following the serial number. The code is decoded as a function code of the I10 unit 21 with serial number 11hl and its function is recognized.

Next, the control device 1 increments the serial number and outputs a function code output command with the serial number 2 to the serial data communication line Il.

This serial data is stored in the I10 closest to the control device.
unit 21 and the next stage I10 unit 22 (not shown in FIG. Since a serial number (floor 2) different from the held serial number (N[L 1 ) is attached, the serial data is not imported.

On the other hand, the I10 unit 22 at the next stage writes the serial number level 2 into the register provided in the I10 unit 22, and supplies the signal GO to the corresponding AND gate in the same manner as described above. enables reception of data (function code output commands) to subsequent I10 units (i.e. 23) through. Furthermore, the 10 unit 22 has a function code (the I10 unit 2) to which the serial number 2 has been added to the control device 1.
The control device 1 returns the received function code as I1 corresponding to the serial number 2.
It is decoded as a function code of 0 unit 22 and its function is recognized.

In the same manner, the control device controls all I10 units 2.
Serial numbers are sequentially assigned to units 1 to 2n, and the function codes corresponding to each of the 110 units assigned a predetermined serial number are decoded to sequentially recognize their functions. Then, the control device is the I10 unit next to the last I10 unit 2n.
Unison) When outputting a function code or output command to an I10 unit that does not actually exist, if the function code data is not received within a certain period of time, the I10
determining that there are no more units, and recognizing the number of I10 units connected to the serial data communication line;
End the initialization process.

After the initialization process is completed, data with serial numbers is sent and received between the control device and each of the 110 units.
It becomes possible to communicate with the unit. That is, by transmitting data with the serial number attached from the control device side, the I10 unit side determines which I10 unit the data (instruction code) is for, and then sends the data to the specified I10 unit.
It is possible to selectively control the units (for example, store predetermined data in a predetermined memory unit provided in a predetermined I10 unit), and also return data with a predetermined serial number from the predetermined I10 unit. This allows the control device to identify which I10 unit the data is returned from, so it is possible to communicate between a common control device and any number of I10 units simply by using a pair of serial data communication lines. This makes it possible to communicate between them.

FIG. 3 shows an example of the structure of serial data used in the present invention. The serial number described above is added to the beginning of each serial data as, for example, 8-bit data, and then the number of data [i.e., If the data to be sent (instruction code, function code, other data, etc.) is 8 bits (1 byte), 1.16 bits (2 bytes in the case of 2 bytes) is added, followed by The above-mentioned predetermined data is added, and finally an end code is added as an 8-bit code, for example.

Therefore, when assigning a serial number to each of the 110 units when the power is turned on, the command code in the data part is used as the function code output command code, and when each of the 110 units returns its own function code, the above data The part corresponds to the function code. After that, from the control device side, the predetermined I1
For example, a predetermined instruction code or data (for example, data to be stored in a memory unit) is sent to the 0 unit (corresponding to the above serial number), while each I10 unit sends predetermined data (for example, a command to send from the control device side). data) is returned, and on the control device side, it is possible to identify from which I10 unit the data was returned based on the serial number.

〔Effect of the invention〕

According to the present invention, an arbitrary number of controlled devices can be connected in cascade using only one pair of serial data communication lines, and the control device can automatically determine the function of each controlled device to control a predetermined controlled device. Since data can be selectively exchanged with the control device, flexible unit connections can be achieved.

[Brief explanation of drawings]

FIG. 1 is a diagram showing the overall configuration for implementing a serial data combining method as an embodiment of the present invention, FIG. 2 is an internal configuration diagram of the I10 unit in FIG. 1, and FIG. FIG. 4 is a diagram illustrating the structure of serial data used in the invention. FIG. 4 is a system block diagram for controlling a plurality of I10 units in the prior art. (Explanation of symbols) 1... Control device, 21, -2 n - Controlled device (I10 unit), 12.13... Transmission circuit and reception circuit on the control device side, 210.212... Bow 10 Transmitting circuit and receiving circuit in unit 21, 213...I10 OR circuit in unit 21, 2
14...Gate circuit (AND gate) in I10 unit 21, A,, j! ,...a pair of serial data communication lines.

Claims (1)

[Claims] 1. A plurality of controlled devices are connected in series to the control device using a pair of serial data communication lines, and when the power is turned on, each controlled device is connected in order through the serial data communication line, starting from the controlled device closest to the control device. At the same time, by reading the function code of the controlled device, the function of each controlled device is recognized in the control device, and from then on, the data with the serial number is used to identify the control device and each controlled device. A serial data combination method characterized in that data is exchanged with a device.