JP2709720B2 - Line connection method between the numerical controller and its peripheral devices - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a line connection system between a numerical controller and peripheral devices of the numerical controller.

2. Description of the Related Art Conventionally, when a peripheral device is connected to a numerical controller, an operator has to manually set a line condition for communication with the peripheral device in the numerical controller.

For example, according to the peripheral device connected to the numerical controller, the baud rate for communication, the number of stop bits, and information about the type of peripheral device to be connected, for example, whether the floppy disk drive or the paper tape reader, etc. It had to be set manually on the numerical controller.

Problems to be Solved by the Invention As described above, in a method in which an operator manually sets a communication line with a peripheral device by using a numerical controller, the operator needs to perform any setting for the line of the numerical controller and the peripheral device. You need to know what matters. Further, the operator needs to set the numerical control device and the peripheral devices in a communicable state for the necessary setting items.

The setting work of these operators must be performed while referring to manuals of numerical control devices and peripheral devices, etc.
Further, it is necessary to confirm whether or not the setting has been made without error, and the workload of these operators is increased.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a line connection method for automatically setting various line setting conditions for a communication line between a numerical controller and a peripheral device.

Means for Solving the Problems In order to solve the above-mentioned problems, a numerical control device according to the present invention is configured to sequentially change communication conditions for line setting to a peripheral device connection cable of the numerical control device and issue a call command for a peripheral device. It is transmitted at a predetermined time interval. When the peripheral device detects a call command that matches the communication conditions, the peripheral device returns a response signal to the numerical control device, and the numerical control device receives the response signal within the predetermined time interval and responds to the call command when the response is received. Is set as the communication condition of the numerical controller, and the line setting is automatically performed.

The numerical controller changes the communication conditions such as the baud rate and the number of stop bits to the cable to which the peripheral device is connected, and sends out the calling command sequentially. The peripheral device receives the call command. However, if the communication conditions do not match the peripheral device connected to the cable, the peripheral device cannot recognize the call command and output a response signal. It does not send. On the other hand, when the communication conditions are met and the peripheral device detects the call command, a response signal is transmitted to the numerical controller. The numerical controller receives the response signal and fixes the communication condition at the present time. As a result, the communication line between the numerical controller and the peripheral device is automatically set to a communicable state.

Embodiment FIG. 1 shows a flow chart of a line setting process of a numerical controller according to an embodiment of the present invention. Except for the point that the line setting protocol shown in FIG. 1 is provided between the numerical controller and the peripheral device, the hardware of the numerical controller and the peripheral device have the same configuration as that of the conventional device. The configuration of the device and peripheral devices is omitted.

When a peripheral device is connected to the numerical controller via a signal cable and a communication line setting command is input to the numerical controller, the microprocessor of the numerical controller starts the processing of FIG. Is transmitted to the communication cable to which the peripheral device is connected (step S1).

That is, as shown in an example in FIG. 2, the command “ST” including the initially set baud rate and the number of stop bits is used.
N "(STANDBY?). In FIG. 2, the command" STN "composed of 2400 bauds and 2 stop bits is transmitted as the initially set command.

Then, the timer T is started (step S2), and before the timer T counts the set time t1 (see FIG. 2) and before the time is up, it is determined whether or not a response signal is returned from the peripheral device (step S3). , S4), timer T without response signal
When the time is up, it is determined whether or not commands have been transmitted with all the set values (if there are n types of commands having different set values, it is determined whether or not n types of commands have been transmitted).
(Step S5) If the command has been transmitted with all the set values, the command with the next set value is transmitted (Step S6). In FIG. 2, the command "STN" is transmitted with 4800 baud and 2 stop bits. Then, the timer T is reset and started again (step S7),
Until the timer T times out, it is determined whether a response signal has been transmitted from the peripheral device (steps S3, S4). Hereinafter, the processing of steps S3 to S7 is repeated until a response signal is transmitted. Command "ST" using all setting values
If the response signal is not received even if "N" is transmitted, an error display of the peripheral device is displayed on the display device of the numerical controller as a connection error of the peripheral device or the communication cable (step S).
8).

On the other hand, if there is a response signal from the peripheral device before the command of the certain condition is transmitted and the timer T times out (second
In the figure, at t2 <t1), the communication condition is fixed to the currently set command condition and stored in the memory of the numerical controller as the communication condition of the peripheral device (step S9). That is, the numerical controller changes the communication conditions such as the baud rate and the number of stop bits, and sends out a call signal “STN” of the peripheral device, and the peripheral device issues a call signal command “STN” consisting of conditions that match its own communication condition. The first time that a call signal has been sent is detected upon reception, and a response signal is sent. For example,
FIG. 2 shows an example in which the peripheral device connected to the communication cable is a floppy disk drive (FDD) and the communication condition of the floppy disk drive is a configuration of 9600 baud and 2 stop bits. Then, from the numerical controller, a command signal "STN" of a call signal composed of 2400 baud and 2 stop bits is transmitted, and then a command "STN" of 4800 baud and 2 stop bits is transmitted.
When the 9600 baud, 2 stop bit command “STN” is sent, the floppy disk drive of the peripheral device detects the call signal command “STN” for the first time and sends the 9600 baud, 2 stop bit to the numerical controller. Return the response signal command “OKF” (OK, FLOPPY). (Timer t is the time t1 until the peripheral device sends a response signal.
The numerical controller receives the command “OKF” of the response signal (step S3) and changes the communication condition value to the current value (9600 baud, 2 stops in the example of FIG. 2). Bit), and stores this value in the memory, and recognizes the connected peripheral device from the command returned from the peripheral device and stores it in the memory (step S10). That is, in the example of FIG. 2, the reply command “OKF”
Thus, the fact that the floppy disk drive is connected is detected and stored. After the communication line is set in this way, data is exchanged between the peripheral device and the numerical controller according to the stored communication conditions.

As described above, the communication conditions with the connected peripheral device are automatically determined, and the type of the peripheral device connected to the numerical controller is automatically recognized. There is no need to set manually.

Effect of the Invention In the present invention, the communication condition of the communication line between the numerical control device and the connected peripheral device is automatically set and automatically set to a communicable state. It is only necessary to connect the communication device and the peripheral device to the communication cable, and there is no need to perform any other operation for setting the communication line, and the amount of work of the operator can be reduced.

[Brief description of the drawings]

FIG. 1 is a flow chart of a line setting process of a numerical controller according to an embodiment of the present invention, and FIG. 2 is an explanatory diagram for explaining an example of signal transmission and reception between the numerical controller and peripheral devices in the embodiment.

Claims (1)

(57) [Claims] A numerical controller sends a peripheral device calling command to a peripheral device connection cable of the numerical controller at predetermined time intervals while sequentially changing communication conditions for line setting. When a call command that matches the communication conditions is detected, a response signal is returned to the numerical controller. The numerical controller receives the response signal within the predetermined time interval and numerically controls the communication condition of the call command when responding. A line connection method between a numerical controller and its peripheral devices that is set to the communication conditions of the device and automatically sets the line.