AT-Control SMS Module Send and receive SMS from and to the AT-control-system. 1. Sending SMS: With the SMS module the AT-Control can send alarm SMS. The alarm is activated, e.g. if the actual measured values exceed or fall below programmed alarm values. The module can send an alarm SMS to a mobile telephone. All connected sensors can be used for the alarm function. The SMS shows the actual status of the sensor. Alarm of level sensors will indicate if the actual value exceeds or falls below the desired level, Redox or pH alarm will include the actual value of the redox or pH-probe. 2. Receiving SMS: SMS with any content can be sent to the SMS module and shown on the display of the controller. If an SMS with a preset code is sent to the AT-Control (e.g.: “info pH”) The AT-Control will send an SMS back with the actual value of the pH probe. (e.g.: pH = 8.23) To operate the SMS module, a working sim-card of a mobile phone company is needed.