Configuring Modbus RTU mode - AQT400

AQT400 Series Configuration Guide

Document code
English (United States)
Document type
User guide
Modbus RTU mode may give communication errors. This does not affect data transfer or the availability and accuracy of measurement data. You may safely ignore the errors.
  1. Establish a connection to AQT400. See Connecting to AQT400 with RS-232 (CLI).
  2. Port settings are 8E1 (8 data bits, even parity, one stop bit). To use the RS-485 port in Modbus RTU mode, type the following:
    set rs485_baud=9600
    set rs485_mode=4
    set rs485_parity=e
    set rs485_databits=8
    write --really
    reboot --really

    If you connect several devices to the same port, define the correct parity setting.

  3. To reboot the device and check that the settings are correct, type the following:
    reboot --really
    show rs485_mode
  4. When done, close the connection.