... Remote Control,Monitoring & Alarming!x-Messenger- Expandable GSM/GPRS PLC incorporates a wide range of CPUs, expansions, various ... accessories and software, specially designed for GSM/GPRS wireless systems being used for remote measurements, data logging, ... (333Hz) optional Ø Pre-configured standard functions, e.g. on/ off-delays, pulse relay ,counters ,Watchdog function ,PI ...