... non-transparent data transfer by RS485 and RS232 over GPRS. It can be connected to intelligent instrument and industrial meters ... to internet, and transferring data from internet(Monitoring center or server) to device.Skype: AsiaGSMalarm Industrial GPRS Modbus RTU,GPRS DTU ... ,GPRS data logger S280(4AIN, 2DIN,2DOUT)