Applies To:
  • CitectSCADA 3.10

A new protocol for Modbus ASCII has been included in Citect V3.10, however there is no information on how to use it. 

To use the Modbus ASCII you will first need to edit the CITECT\BIN\PROTDIR.DBF file and insert the following line.
MODBUSA MODBUS 400 2000 0x17f

The name of the Protocol in the IODevice form will be ModbusA. Everything else will be the same as for the Modbus binary protocol, see the Design Guide for more details.