Patent ID: 8223035

Claim:
A method for start-up and/or operation of a communication system composed of at least one multivariable sensor, at least one converter unit and at least one receiving unit, which are connected with one another via a two-wire line, comprising the steps of: providing from the multivariable sensor via the two-wire line a primary measured value in the form of an analog signal and extra measured values in the form of an encoded digital signal modulated on the analog signal; receiving only analog signals by the receiving unit; converting the extra measured values in the multivariable sensor into formatted values by means of a conversion algorithm; requesting at least the formatted values and received by the converter unit; producing corresponding analog signals of the extra measured values from the formatted values in the converter unit by a fixedly predetermined, unconfigurable, reconversion algorithm; and transmitting the analog signals of the extra measured values via respective separate electrical current lines to the receiving unit.