The bus address is factory-set to 20. It can be changed in the PrimaryAddress input field.Connection via serialinterfaceCOM 1The CMU can be connected to the serial interface of a controller via one ofthe serial interfaces COM 1 or COM 2 and a so-called null-modem cable. Thepin assignment and wiring of a null-modem cable are described in sectionHandshake of chapter 8. The technical specifications of the serial (RS-232-C)interface are also discussed in chapter 8 (refer to section HardwareInterfaces).Either a 25-pin or a 9-pin connector can be used on the controller side. It maybe necessary to use an appropriate adapter (see chapter 8, HardwareInterfaces).