Bosch D9127U SF 09/12 the on-board micro-processor ensures that

the on-board micro-processor ensures that the relay is in the proper ON/OFF state

One D7039 Multiplex Expansion Module is required in the system to use the D7042/D7042B Eight Input Remote Modules

Class B and Class A wiring is supported

Achieving a balance between reliable security and refined functionality

LT-V700F Twin Peaks 2004-2005

Bosch D9127U SF 09/12 the on-board micro-processor ensures thatThe Bosch D9127U POPIT Module (without tamper switch) provides point identification of initiating devices, and supervises wiring to devices for circuit integrity. For use when there is a need to expand a compatible control panel beyond its standard number of on board initiating zones or points. The D8125 Multiplex Zone Expander is required. The D9127 modules are wired in parallel on the D8125 data loop.