The BOSCH B228 SDI2 Expansion Module is a versatile and powerful add-on designed specifically for the Solution 4000 control panel, providing an additional 8 supervised inputs (zones) and 2 switched outputs. This compact, high-performance module allows for the expansion of your intrusion alarm system, making it ideal for growing residential, commercial, and industrial security applications.

By utilizing Split EOL wiring, the module supports up to 16 zones per device, allowing installers to maximize coverage without increasing physical footprint. Its two independently switched outputs can be programmed to activate based on system events, offering flexible control for sirens, strobes, or automation triggers. Seamless integration via SDI2 communication bus ensures fast, reliable, and secure data exchange with the main panel.

What’s Included in the Box

• 1x B228 SDI2 8-Input, 2-Output Expansion Module

• 1x Hardware Pack

• 1x Interconnect Cable

• 1x Installation Manual

Main Features

• 8 Supervised Inputs – Supports both Normally Open and Normally Closed contacts

• 2 Switched Outputs – OC1 and OC2 independently controlled via control panel commands

• Zone Expansion – Up to 16 zones via Split EOL (3k3 / 6k8) per module

• Tamper Protection – Dedicated tamper switch connector for added security

• LED Status Indicator – Visual feedback on module power and activity

• SDI2 Bus Interface – Secure and efficient communication with Bosch Solution 4000

• Compact Design – Easy integration into new or existing security systems

• Wide EOL Resistor Compatibility – Supports multiple resistor values for zone programming

Technical Specifications

Electrical

• Voltage: 12 VDC (nominal)

• Current Draw: 30 mA

• Output Voltage: 12 VDC

Mechanical

• Dimensions: 73.5 mm (H) x 127 mm (W) x 15.25 mm (D)

• Terminal Wire Size: 12 AWG to 22 AWG (2 mm to 0.65 mm)

Environmental

• Operating Temperature: 0°C to 50°C

• Operating Humidity: 5% to 93% RH, non-condensing

Connectivity

• SDI2 Bus Distance: Up to 305 m (1000 ft) with 18-22 AWG unshielded wire

• EOL Resistors Supported: 1kΩ to 22kΩ, Split EOL (3k3 / 6k8)

• Max Loop Resistance: 100 Ω

Warranty Information

The BOSCH B228 module is backed by a 3-year limited manufacturer’s warranty, covering defects in material and workmanship under normal usage.

Datasheet

Brand Information

Bosch Security Systems is a trusted leader in advanced security technologies, providing innovative and reliable solutions for intrusion detection, access control, video surveillance, and more. With a focus on performance and durability, Bosch products are designed to meet the evolving demands of professional security applications.

SKU

B228

Practical Use Scenarios

• Residential Expansions – Add sensors to garages, sheds, or outdoor zones

• Retail and Commercial Sites – Secure new entry points, loading bays, or back offices

• Warehouses – Expand coverage to remote storage or access-controlled areas

• Educational Institutions – Integrate additional classrooms or utility areas into the main panel

• Multi-Story Offices – Manage added zones and automation with compact installation footprint

Excellence for the Australian and New Zealand Market

• Regionally Compliant – Certified with RCM and conforms to EN50130-4:2011 standards

• Optimized for ANZ Security Standards – Engineered for compatibility with Solution 4000 systems distributed in Australia and New Zealand

• Sourced from Authorized Distributors – Ensuring product authenticity and warranty validity

• Local Warranty and Support – Warranty claims and support handled directly by Bosch representatives across Australia and New Zealand

• Designed for Harsh Conditions – Performs reliably across typical Australian and New Zealand temperature and humidity ranges

Frequently Asked Questions (FAQs)

Q1: How many zones can the B228 support using Split EOL?
A1 (B228): Each B228 module supports up to 16 zones using Split EOL wiring (3k3 / 6k8 resistors).

Q2: Is the B228 compatible with all Bosch panels?
A2 (B228): No, it is specifically designed for the Solution 4000 control panel with SDI2 bus compatibility.

Q3: Can the outputs on the B228 be used for automation tasks?
A3 (B228): Yes, the 2 switched outputs (OC1 and OC2) can be programmed for system events, ideal for automation triggers or external devices.

Q4: Does the B228 require external power?
A4 (B228): No, it draws power directly from the SDI2 bus (12 VDC, 30 mA typical draw).

Q5: Is tamper detection supported on the B228 module?
A5 (B228): Yes, it includes a tamper switch connector to report enclosure breaches to the control panel.

Q6: What is the maximum wiring distance for SDI2 communication?
A6 (B228): The maximum distance is 305 metres (1000 ft) when using 18–22 AWG unshielded wire.

Q7: Is the B228 approved for use in Australia and New Zealand?
A7 (B228): Yes, it holds RCM certification and is optimized for local compliance and performance.