Page - 1306 - in Book of Full Papers - Symposium Hydro Engineering

. 2.3 SENSOR COMMUNICATION & DATA TRANSMISSION 2.3.1. Monitoring system with SDI-12 Interface sensors The SDI-12 system is a bus communication system in which a wide array of dam monitoring sensors can be connected to a single 3-core cable. This is a great advantage and is possible as the electrical interface for the protocol involves three lines: a serial data line, a 12 V power line, and a ground line. The datalogger, featuring GSM/GPRS modem transmits the logged data over the cellular network to the web-based data monitoring service described in section 3. Refer to Fig. 5 for a block diagram of dam monitoring instruments network built on an SDI-12 bus. Fig. 5 Dam monitoring instruments on an SDI-12 network SEEPAGE/FLOW IN-PLACE INCLINOMETER WITH SDI-12 CLOUD WDMS SERVER INTERNET SDI-12 INTERFACE DATALOGGER WITH GSM/GPRS MODEM CELLULAR PHONE NETWORK REMOTE USER PC/LAPTOP BOREHOLE EXTENSOMETER SDI-12 INTERFACE VW PIEZOMETER SDI-12 INTERFACE SDI-12 INTERFACE SDI-12 INTERFACE SDI-12 INTERFACE TILT METER WITH SDI-12 VW CRACK METER STRAIN/ STRESSESTELECOORDINOMETER SDI-12 INTERFACE WEATHER STATION SDI-12 INTERFACE Fig. 4 ATS control box 1306