... Support RTU extended protocol 3.8 Digital inputs, 4 relay outputs F2164 MODBUS GPRS RTU Technical SPECIFICATION F2164 GPRS RTU ... has multiple functions (analog input,relay output, digital input, digital output, pulse counting and wireless data communication, etc).It adopts high ... )u Support RTU extended protocol.When reporting acquisition data failure, acquisition data are saved to 2M byte SPI FALSH.u ...