What do I need to establish Modbus communication with an Airmaster controller?

What do I need to establish Modbus communication with an Airmaster controller?

Modbus communication with an Airmaster controller.


Q:        What do I need to establish Modbus communication with an Airmaster controller?
A:        Follow the steps described below for the Airmaster controller you want to configure for Modbus communication.

Requirements
  1. Q1 controller.
  2. RS485 to serial converter. This device is used to convert the RS485 language of the controller into a serial communication for the PC.
  3. Program or device to send out modbus commands. This could for example be a PLC, or a simulation program. (Modbus master)
  4. Fieldbus list of the Airmaster Q1 controller. This document teaches you about what information is stored in which register, and how to interpret it.
Workflow
  1. Connect your RS485 to serial converter to the (configurable) RS485 communication port X04.
  2. Configure this communication port to be equally set up as the modbus master (e.g. the PLC).
    1. Go to P10 EQUIP settings 1.
    2. Scroll down to P10.09 (RS485 X04 CONFIG) and press the ENTER button.
    3. Set P10.09.01 to modbus slave
    4. Adjust the parameters below to match the parameters of the modbus master device.
  3. Insert the RS485 serial converter to your PC. Or generally speaking, establish a hardware connection to your modbus master device.
    1. When inserted into a PC, make sure that the serial connection is established, and that the correspondent COM's port is available.
  4. Configure the modbus master to match the parameters of the modbus slave. (Baudrate, stop bits, parity bit, data bits)
  5. Consult the fieldbuslist to learn about the registers.
Consult the following manual to learn more about  how to configure and communicate with Airmaster & Metacentre products using Modbus RTU.