NOVELTY - The circuit (30) has two terminals (11, 12) for connection with buses of a bus system. A transceiver circuitry (20) is connected with the two terminals, and a control electronic unit (10) communicates with external control units and the transceiver circuitry. The circuit is connected with a battery cell of a battery module. A series arrangement (8) is formed from a line terminal resistor (5) and a switching unit (6) i.e. MOSFET, where ends of the series arrangement are electrically connected with one of the two terminals. The switching unit is controlled over the electronic unit.    USE - Monitoring circuit for use in a monitoring system for measuring a temperature and a voltage of a battery cell of a battery module in a battery i.e. lithium ion battery, that is connected with a drive system of a motor car (all claimed). Can also be used for an electrical vehicle and a hybrid vehicle.    ADVANTAGE - The series arrangement is formed from the line terminal resistor and the switching unit, where the ends of the series arrangement are electrically connected with the terminal, thus avoiding requirement of harness with soldered line terminal resistors while producing the circuit and/or battery module using same hardware and software components, and hence simplifying maintenance and start-up of the monitoring system. The series arrangement is arranged within the transceiver circuitry, thus saving costs of the circuit. The switching unit exhibits rapid switching time and stable amplifying and response times.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for the following:    (1) a monitoring system    (2) a method for initializing a monitoring system.    DESCRIPTION OF DRAWING(S) - The drawing shows a circuit diagram of a monitoring circuit for a battery module.    Line terminal resistor (5)    Switching unit (6)    Series arrangement (8)    Control electronic unit (10)    Terminals (11, 12)    Transceiver circuitry (20)    Monitoring circuit (30)