This is the proxy extension for either a ModbusServerBooleanPoint (BooleanPoint) or ModbusServerBooleanWritable (BooleanWritable) in a server Modbus device. The server BooleanPoint acts as an “input,” where coil values are written by the master. The server BooleanWritable acts as an “output,” where station values can be written as either coil or input (status) values.

For more details, see Modbus server proxy points.