Industrial gprs modbus rtu gprs dtu with RS485,RS232 gprs data logger Name: GPRS Modbus RTUModel: S280(4AIN, 2DIN,2DOUT)The GPRS Modbus RTU S280 ... with High reliable ARM9 MCU and industrial GPRS Engine inside. It is not only a GPRS RTU (Remote Terminal Unit), but ... (Monitoring center or server) to device.Skype: AsiaGSMalarm Industrial GPRS Modbus RTU,GPRS DTU,GPRS data logger S280(4AIN, 2DIN,2DOUT)