Issue:
The Modbus SIO Driver from EcoStruxure Operator Terminal Expert only has RS-232C option. It is not posible to change it to RS-485.
Product Line:
HMIST6400, HMIST6500, HMIST6600, HMIST6700
Environment:
EcoStruxure Operator Terminal Expert v3.3 SP1 and older
Resolution:
The HMIST6 family (except HMIST6200) has two COM ports.
COM1 uses RS-232C and COM2 uses RS-485.
The COM port assigned can be changed by clicking on "Driver" and selecting the COM port in the Target Interface. Changing the COM port will automatically change the SIO type (RS-232C or RS-485).