Analogue circuits; Analogue converters; Analogue output modules; Analogue slave modules; Apparatus designed to monitor the performance of apparatus; Apparatus for checking boiler efficiency; Apparatus for climatic technology; Automatic emergency reporting devices; Bus interfaces; Cellular telecommunications apparatus; Cellular telecommunications instruments; Communication interface units; Alarm control apparatus; Analogue control apparatus; Automatic access control apparatus; Automatic access control systems; Control devices (thermostats) for heating installations; Controller interface modules; Connecting devices for data collection; Data carriers bearing machine readable data; Digital controllers; Digital electrical gauges adapted for use in controlling air pressure; Digital slave modules; Apparatus and instruments for switching electricity; Apparatus and instruments for controlling electricity; Apparatus for controlling the operation of machines (electric); Control apparatus for electric indoor light installations; Electric apparatus for commutation; Electric apparatus for controlling; Electric apparatus for controlling the operations of machines; Electrical apparatus for data acquisition; Electrical controls; Control panels for electronic supervision; Electronic apparatus for data processing; Electronic apparatus for developing communication links; Electronic apparatus for monitoring machines; Electronic control apparatus for automatic machines; Electronic control apparatus for electric motors; Electronic control apparatus for valves; Electronic control systems; Electronic digital automation installations for measuring building services installations; Electronic digital building automation systems; Electronic digital controllers for controlling digital flow control valves; Electronic digital switching apparatus; Computer input instruments; Computer based control apparatus for assembly lines; Communications electronics for computers