RS-232 C Interface FAQ

  • An RS-232C error occurred.

    Any of the following may be a cause.

    • This occurs when the RS-232C cable is not connected correctly to the specified serial port. Check the serial port.
    • This occurs when the RS-232C settings (communication speed, data length, parity, stop bit, delimiters, etc.) are different between the software and the instrument. Check the settings.
    • This occurs when the connection cable is a straight cable. Replace with a cross cable.
    • The serial port may be damaged. Check and use another port.
    • The RS-232C cable may be broken. Check and replace the RS-232C cable.

    How to check the connection
    Start HyperTerminal and check that you can communicate with the instrument.

  • I want to use USB-serial converter cable and run the system, but it doesn’t run well.

    This occurs with instruments compatible with “Breakthrough”, where they reset continuously.
    This appears to occur in recent computers because the voltage output is indefinite when not using RS, due to the power saving design. Conversion cables from some manufacturers also seem to be of this specification.
    The USB serial converter cable that we have verified for normal operation is USB-RSAQ5 made by I/O DATA Corporation.