Pfeiffer Vacuum has developed a Condition Monitoring System (CMS) for monitoring the operating condition of vacuum pumps and vacuum gauges. Monitoring is especially advisable for systems that incorporate a large number of pumps or pumps that are difficult to access. In special applications, data transfer can be effected by means of fiber optics in order to bridge high voltage potentials, for example. Continuous condition monitoring of the pumps and vacuum gauges in a system prevents outages and helps to save costs. The CMS can be employed with all products from the Pfeiffer Vacuum product portfolio that have the Pfeiffer Vacuum protocol or the adixen protocol available via an RS 485 interface.