Modbus-Rtu Communication; General Purpose Communication - Hitachi MICRO-EHV+ Applications Manual

3.21.4 Modbus-RTU communication

Modbus operation is same as CPU port. Refer to section 3.15.4 and 3.15.5 for further information.

3.21.5 General purpose communication

Besides Modbus-RTU communication, option board supports general purpose communication same as CPU port.
Add "SysCom" library by clicking "Add library" on Library manager. Only the difference from CPU port is COM
port number. Be sure to set "COM2". Refer to section 3.25.3 Serial communication for further information.
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Chapter 3 Programming