... gprs modbus rtu gprs dtu with RS485,RS232 gprs data logger Name: GPRS Modbus RTUModel: S280(4AIN, 2DIN,2DOUT)The GPRS ... a GPRS DTU (Data Transfer Unit) and a GPRS Data Logger. It is the best solution for small application data logging ... .Skype: AsiaGSMalarm Industrial GPRS Modbus RTU,GPRS DTU,GPRS data logger S280(4AIN, 2DIN,2DOUT)