Does ACS355 have inbuilt RS485 functionality or there is some other way of communicating with it over modbus.
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As far as I know, ACS355 driver does not have built in modbus rtu port.
For modbus RTU protocol you have to use FMBA-01 module.
Please visit below link, this link explains how to communicate AC500 eCo series PLC and ACS355 drive over Modbus RTU.