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Bosch B901 Access Control Module - Card Reader Expansion with Indicator Light - Programmable Key - 12VDC Input - 5-Wire Weigand Interface
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Product Features
Technical Overview
The B901 module delivers precise electrical management for access control systems. It supplies +5VDC or +12VDC to power connected readers and includes an open collector output for reader LED control. The module handles unsupervised inputs for tamper, REX (Request to Exit), and RTE (Request to Enter) devices, along with a supervised input using a 1KΩ end-of-line resistor for door contact monitoring.
Wiring flexibility is a key technical advantage, with support for 18 AWG to 22 AWG terminal wire sizes. Maximum SDI2/SDI wiring distances vary based on configuration: up to 2500 ft (762 m) with external power supply using 18 AWG wire, 500 ft (152 m) from control panel with 18 AWG, and 500 ft (152 m) between module and reader with 18 AWG.
Key Product Advantages
The Bosch B901 simplifies access control expansion with its focused design and robust compatibility. It eliminates the need for complex external interfaces by providing direct card reader integration within the Bosch ecosystem, reducing installation time and potential points of failure.
Enhanced System Integration
Seamlessly connects to Bosch control panels including B9512G, B8512G, D9412G, and D7412G series, maintaining system integrity and centralized management.
- Direct panel compatibility
- Centralized control
- Reduced integration complexity
Flexible Reader Support
Compatible with a wide range of Bosch readers including EM Prox, HID iClass, HID Prox, and PIN readers, plus credentials from EM tokens to iClass cards.
- Multiple reader types
- Broad credential support
- Vandal-resistant options
Reliable Performance
Operates within industrial temperature ranges and humidity levels while meeting multiple UL standards for access control and alarm systems.
- Wide operating range
- UL certified
- Stable in varied environments
Deployment / Use Cases
The B901 Access Control Module is specifically designed for door security applications where card reader integration is required. It serves as the interface between Bosch security panels and credential readers, making it ideal for controlled entry points in office buildings, educational facilities, healthcare institutions, and government installations.
Typical deployments include main entrance doors, secured interior doors, server room access, and restricted area entry points. The module's compact dimensions allow for discreet installation in electrical closets, above door frames, or within secured enclosures while maintaining accessibility for maintenance and configuration.
Commercial Building Security
Manage employee and visitor access to office spaces, meeting rooms, and sensitive areas with integrated card reader control.
Institutional Access Control
Secure classrooms, laboratories, administrative offices, and storage areas in schools, hospitals, and government facilities.
Physical Profile
The B901 module features a compact square design measuring 2.90" (73.66 mm) in both height and width with a slim 0.60" (15.24 mm) depth. This space-efficient form factor enables installation in confined spaces while maintaining proper ventilation and accessibility for wiring connections. The module includes mounting provisions for secure attachment using the provided self-tapping screws.
The physical profile is practical for deployment planning because the dimensions and weight are clearly defined: 2.90" (73.66 mm), 2.90" (73.66 mm), 0.60" (15.24 mm). This helps confirm rack, shelf, desk, or cabinet fit before installation.
- Width
- 2.90" (73.66 mm)
- Depth
- 0.60" (15.24 mm)
- Height
- 2.90" (73.66 mm)
What's in the Box
The B901 Access Control Module ships complete with all necessary components for installation and operation.
Highlights
- Expands Bosch security systems with card reader functionality
- Supports standard 5-wire Weigand interface readers
- Includes indicator light for status monitoring
- Programmable function key for customizable control actions
- 12VDC nominal input with +5VDC/+12VDC reader power supply
- Compatible with Bosch B9512G, B8512G, D9412G, and D7412G control panels
- Works with EM Prox, HID iClass, HID Prox, and PIN readers
- Compact dimensions: 2.90" × 2.90" × 0.60" (73.66 × 73.66 × 15.24 mm)
- Supervised input with 1KΩ end-of-line resistor for door contact
- Multiple UL certifications including UL 294 for access control systems
Specifications
| Specifications | |
|---|---|
| Manufacturer | The Bosch Group |
| Manufacturer Part Number | B901 |
| Brand Name | Bosch |
| Product Model | B901 |
| Product Name | B901 Access Control Module |
| Product Type | Access Control Expansion Module |
| Technical Information | |
| Device Supported | Card Reader |
| Features | Indicator Light,Programmable Function Key |
| Physical Characteristics | |
| Height | 2.90" (73.66 mm) |
| Width | 2.90" (73.66 mm) |
| Depth | 0.60" (15.24 mm) |
| Miscellaneous | |
| Package Contents | B901 Access Control Module 1 x kΩ 1/2 Watt End of Line Resistor 1 x Innerconnect Cable (included) 3 x # 6x3/8 self-tapping Screws 1 x Literature |
| Additional Information | Relative humidity: 5% to 93% at +32°C (+90°F) Temperature (operating): 0°C to +49°C (+32°F to +120°F) Current Standby: 110 mA + reader current Alarm: 110 mA + reader current Output (alarm): Form C relay (COM, NC, NO) at 12/24 V @ 2.0 A Voltage (input): 12 VDC nominal Terminal wire size: 18 AWG to 22 AWG (1.02 mm to 0.65 mm) SDI2/SDI wiring to B901 + Reader with external power supply: Maximum distance - wire size (unshielded wire only): 1000 ft (305 m) - 22 AWG (0.65 mm), 2500 ft (762 m) - 18 AWG (1.02 mm) SDI2/SDI wiring to B901 + Reader from control panel: 175 ft (61 m) - 22 AWG (0.65 mm), 500 ft (152 m) - 18 AWG (1.02 mm) Wiring distance from B901 to Reader: 200 ft (61 m) - 22 AWG (0.65 mm), 500 ft (152 m) - 18 AWG (1.02 mm) Reader dependant Functions: Reader Input Standard 5-wire Weigand interface. +5 VDC or +12 VDC supplied to power readers. Open collector output for reader LED. Unsupervised Inputs Tamper - supports normally open devices. REX - supports normally open devices. Request to Exit on short. RTE - supports normally open devices. Request to Enter on short. Supervised Input 1KΩ End of line resistor. Use for door contact. |
| Application/Usage | Door |
| Compatibility | Control Panels: B9512G/B9512G-E B8512G/B8512G-E D9412GV4/D7412GV4 D9412GV3/D7412GV3 D9412GV2/D7412GV2 D9412G/D7412G Readers and Accessories: ARD-AYH12 EM Prox Wall Mount ARD-AYJ12 EM Prox Mullion ARD-AYK12 EM Prox Mini Mullion ARD-AYQ12 EM Prox Wall Mount Vandal Resistant ARD-AYCE65B EM Prox or PIN Mullion ARD-R10 HID iClass Mini Mullion ARD-R40 HID iClass Wall Mount D8223 HID Prox Wall Mount D8224 HID Prox Mullion D8224-SP HID Prox Switch Plate Mount D8225 HID Prox Mini Mullion D8229 PIN Reader Credentials: ACA-ATR13 EM Tokens ACD-ATR11ISO EM Cards ACD-ATR14CS EM Clamshell Cards ACD-IC2K26-50 iClass Cards ACT-IC2K26-10 iClass Tokens D8236-10 HID Prox Cards D8236KF-10 HID Prox Tokens |
| Certifications & Standards | UL 294 - Access Control System Units UL 365 - Police Station Connected Burglar Alarm Units and Systems UL 609 - Local Burglar Alarm Units and Systems UL 864 - Control Units and Accessories for Fire Alarm Systems UL 985 - Household Fire Warning System Units UL 1023 - Household Burglar-Alarm System Units UL 1076 - Proprietary Burglar Alarm Units and Systems UL 1610 - Central Station Burglar Alarm Units CSFM - California Office of The State Fire Marshal FCC Part 15 Class B |
FAQ
What type of readers does the Bosch B901 module support?
The B901 supports card readers using the standard 5-wire Weigand interface. It is compatible with various Bosch readers including EM Prox models (wall mount, mullion, mini mullion, vandal resistant), HID iClass readers (mini mullion, wall mount), HID Prox readers (wall mount, mullion, switch plate mount, mini mullion), and PIN readers. The module supplies +5VDC or +12VDC to power these readers.
Which Bosch control panels are compatible with the B901 module?
The B901 is compatible with multiple Bosch control panel series including B9512G/B9512G-E, B8512G/B8512G-E, D9412GV4/D7412GV4, D9412GV3/D7412GV3, D9412GV2/D7412GV2, and D9412G/D7412G. This broad compatibility ensures integration with both current and legacy Bosch security systems for door access control applications.
What are the wiring distance limitations for the B901 module?
Wiring distances depend on configuration and wire gauge. With external power supply using unshielded wire: up to 1000 ft (305 m) with 22 AWG or 2500 ft (762 m) with 18 AWG. From control panel: up to 175 ft (61 m) with 22 AWG or 500 ft (152 m) with 18 AWG. Between module and reader: up to 200 ft (61 m) with 22 AWG or 500 ft (152 m) with 18 AWG. Terminal wire size supports 18 AWG to 22 AWG (1.02 mm to 0.65 mm).
What electrical specifications does the B901 module have?
The module operates on 12 VDC nominal input. Current draw is 110 mA plus reader current in both standby and alarm states. The alarm output is a Form C relay (COM, NC, NO) rated at 12/24 V @ 2.0 A. The module supplies +5VDC or +12VDC to power connected readers and includes an open collector output for reader LED control.
What environmental conditions can the B901 module operate in?
The B901 operates within a temperature range of 0°C to +49°C (+32°F to +120°F) and relative humidity of 5% to 93% at +32°C (+90°F). These specifications ensure reliable performance in typical indoor environments including office buildings, schools, and institutional facilities where access control systems are commonly deployed.
What certifications does the Bosch B901 module carry?
The B901 carries multiple safety and compliance certifications including UL 294 for Access Control System Units, UL 365 for Police Station Connected Burglar Alarm Units, UL 609 for Local Burglar Alarm Units, UL 864 for Fire Alarm Control Units, UL 985 for Household Fire Warning Systems, UL 1023 for Household Burglar-Alarm Systems, UL 1076 for Proprietary Burglar Alarm Units, UL 1610 for Central Station Burglar Alarm Units, CSFM from California State Fire Marshal, and FCC Part 15 Class B.
What connectivity or interface options are available?
Connectivity details help confirm how Bosch Access Control Module With Indicator Light And Programmable Function Key For Door B901 can integrate with your network, accessories, and surrounding peripherals before rollout or replacement planning.
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