... Control,Monitoring & Alarming!x-Messenger- Expandable GSM/GPRS PLC incorporates a wide range of CPUs, expansions, various accessories and software, ... sensors, smoke, gas, motion, shock and noise detectors, etc.Highlights at a glanceØ Integral GSM 850/900/1800/1900 modemØ GPRS, SMS and ... pulse widthØ Default Real Time Clock (RTC) Ø Backup at Real Time Clock (RTC) at 25 °C:100 hoursØ 2 PWM channels(333Hz ...