If you want to configure the HMI as Modbus master on RS485 to communicate with up to any 125 Modbus slave devices, proceed as follows:

In HMI-Tool:

  • Setup a link and choose the right “Link Interface” COM1, COM2, USB,…
  • Select as “Address mode” the “Extended Mode” for RS485 mode.This will let you address particular MODBUS devices, instead of just one:
  • Once you have extended mode selected, when you will select a tool, the slave ID and the register address can be filled in:
    Here, slave ID=0, register=4×82