... GPRS DTU is widely used in unattended operation device, Remote AMR, remote data acquisition, remote scheduling and so on. Due to ... Change COM to COM to GPRS remote data transmition Advanced and strict data communication protocol, with the function of correction and encryption. ... humidity: 20%~95% non-condensing SMS GSM Modem Communicator with RS232/RS485 for PLC, Telemetry, SCADA, Data Transfer-S