This is the proxy extension for either a ModbusServerRegisterBitPoint (BooleanPoint) or ModbusServerRegisterBitWritable (BooleanWritable) in a server Modbus device. The server BooleanPoint acts as an “input,” where an individual bit in a holding register can be written by the master. The server BooleanWritable acts as an “output,” where a station boolean value can be written as an individual bit in either an input register or a holding register.

For more details, see Modbus server proxy points.