LinkTx is a compact SMS based monitoring unit, allowing a GSM mobile or GSM enabled computer system to receive alarms and other information from remote locations. Additionally, text messages can be sent to turn equipment on or off and receive up to date measurement and alarm information directly to a mobile phone or PC. Typical applications include security systems, remote diagnostics, equipment alarm notification, flood alert, fire alert, temperature monitoring, asset protection, position monitoring, remote command and control and home automation.