User guide

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Contents
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1. Introduction to GPRS .................................................. 1
2. Hardware ...................................................................... 2
2.1 Power use considerations ........................................................................... 2
3. Network Contract and SIM card ................................. 2
4. Datalogger firmware .................................................... 3
5. PC Software required .................................................. 3
6. Basic Datalogger setup ............................................... 3
7. General Principles of Operation ................................. 7
7.1 Using systems with fixed, public IP addresses .......................................... 7
7.2 Using systems with dynamic IP addresses ................................................ 8
7.3 Keeping the connection open ..................................................................... 9
7.4 Firewall Issues .......................................................................................... 10
7.5 Minimising call costs and power use ....................................................... 10
7.6 Calling the logger in GSM data mode ..................................................... 11
8. Fault finding ............................................................... 11