Bosch B901 — G-Series Single-Door Access Control Module

Turns one door into a fully controlled access point on a G-Series panel. It takes a Wiegand reader, provides request-to-exit and request-to-enter inputs, and manages four door states — locked, unlocked, secured and fire unlock — over the SDI2 bus at 110mA.

Key Details

• Four door states — Including fire unlock, so the door releases automatically on a fire signal as building codes require.
• Wiegand reader interface — Accepts standard Wiegand readers, giving a wide choice of reader hardware for the door.
• REX and REN inputs — Request-to-exit and request-to-enter handled at the module, with a shunt-only option for doors that should not alarm on legitimate use.
• SDI2 bus, SDI compatible — Works on both bus generations across the G-Series range.
• Low 110mA draw — Light enough that several doors do not demand an auxiliary supply immediately.

Where It Fits

One per controlled door on a G-Series system. The fire-unlock state is the reason to use a proper door module rather than driving a lock from a relay output — an egress door that stays locked in a fire is a serious liability.

Technical Specifications

Assurance

• 3-Year Australian Warranty
• Genuine Bosch stock, supplied and supported locally
• Australian-based technical support before and after purchase