This wiring diagram uses a sentry fob receiver, timer circuit, power supply and the av2e winkhaus electric multipoint door lock. Bell system (bstl) audio system with 801 handsets up to 10 ways. Chinese Quad Wiring Diagram Bell (bstl) 801 with a fail safe lock wiring diagrams;Bell door entry wiring diagram. The new model is a bell 801 door entry telephone. Zo 2628 bstl intercom wiring diagram. Select ‘hikvision device’ from the left menu. I've just bought a replacement handset (bell 801) for my