... Messenger SMS Relay-- --Your ideal of Solution for : Remote Control,Monitoring & Alarming!x-Messenger- Expandable GSM/GPRS PLC ... and Counters, High speed inputØ Event based transmissionØ Remote configuration via GPRS and user friendly eSmsConfig softwareØ Firmware ... (333Hz) optional Ø Pre-configured standard functions, e.g. on/ off-delays, pulse relay ,counters ,Watchdog function ,PI controller etc ...