Embedded with GSM module, Alarm Data Logger is not only a modem, but also an intelligent gateway. Alarm Data Logger product series is acted as a M2M platform for applications in telemetry, telemetric, surveillance etc., and provides GPRS PSD data communication as well as SMS service through the 3-band GSM (900/1800/1900) module. The interfaces with the terminal devices are industrial standard RS232, RS485 as well as additional TTL I/O.