This Knowledge Base article how to configure the ISO-485 IO card.
This Knowledge Base article details the Pin out of the ISO-485 IO card.
This Knowledge Base article details how to install and run the open-source mbpoll utility, this provides command line access to read/write Modbus registers.
This Knowledge Base article details how to connect up the the the MyPi Integrator board to a PC running Windows and a Modbus PLC simulator, showing how to read/write RTU registers from the command line.
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