Sending and Reading Sample [comwriteread]

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Overview

This is a sample program for sending and reading data via serial communication.
You can also change the communication parameter settings.

This is a sample program that uses the pySerial module (https://pythonhosted.org/pyserial/).
If you want to run this sample program, please install pySerial beforehand.

Python is an interpreted programming language.
Therefore, there is no need to compile the source code beforehand.

Step to Use

1. Input serial port names to be used after the program starts.
    

Example : Serial port name when using only one COM-1(USB)H
              /dev/ttyUSB0

Example: Serial port name when using only one COM-2(PCI)H and connecting it to CN1 on the device via cable.
              /dev/ttyCom0

2. If you specify the serial port name, a command menu will be displayed and the program will wait for keyboard input.
    Select the desired command by entering the corresponding number on your keyboard.
    

3. You can set serial communication parameters by selecting the "0:Set Parameter" command from the command menu.
    If you do not want to change the serial communication parameters, there is no need to select this command.

    For each parameter, a list of configurable parameters is displayed and then keyboard input is waited for.
    Select the desired parameter by entering the corresponding number on the keyboard.

    When all parameters are selected, "Set Parameter OK" will be displayed.
    After that, a list of the set communication parameters will be displayed, and then the command menu will be displayed again, waiting for keyboard input.

Example: baud rate: 38400bps, data length(byte size): 8 bits, stop bit: 1, no parity, full duplex, no flow control

4. When you select the "1.Write" command from the command menu, "Input Write Data:" is displayed and the program waits for keyboard input.
    If you are not sending a character string via serial communication, there is no need to select this command.
    

    After entering the string data to be sent on the keyboard, press the Enter key and the string data will be sent via serial communication.
    If the string is sent successfully, "Send OK" will be displayed and the command menu will be displayed again, waiting for keyboard input.

Example: Screen display when pressing the Enter key after specifying "Test string" as the string to be sent

5. When you select the "2.Read" command from the command menu, the message "Read Data: b" will be displayed, followed by the character string received via serial communication.
    If you are not receiving character strings via serial communication, there is no need to select this command.

    The received string will be displayed, and then the command menu will be displayed again, waiting for keyboard input.

    The maximum string that can be received at one time is 50 characters.
    Timeout time is 1 second.

Example: If no character string is received, the following screen will be displayed

Example: Screen display of "Test string" string received via serial communication

6. Selecting the "3.Exit" command from the command menu will terminate the sample program.

[ Supplement: List of configurable serial communication parameters ]

All serial communication parameters must match on the sending and receiving sides.
If there is a mismatch in communication parameters, communication will not work properly.