Bosch Security B812 Radion Receiver For SDI2 Panels

The Bosch B812 is a RADION wireless SDI2 bus interface receiver designed to connect compatible wireless intrusion detection devices to Bosch security control panels. Operating at 433.42 MHz, it supports supervision of up to 504 wireless points, 1,000 keyfobs, and 8 repeaters, subject to control panel capacity. The receiver features dual internal antennas, RF interference detection, cover and wall tamper protection, and wireless signal diagnostics. It operates on 10-14 VDC and supports indoor residential and commercial intrusion alarm installations.

Bosch B812 RADION Wireless SDI2 Bus Interface Receiver, 433.42 MHz

The Bosch B812 is a wireless receiver that connects RADION security sensors and control devices to compatible Bosch intrusion alarm panels through the SDI2 communication bus. It receives 433.42 MHz radio signals from RADION motion detectors, door and window contacts, glassbreak detectors, panic buttons, keyfobs, and repeaters. The interface supports supervision of up to 504 wireless points, 1,000 keyfobs, and 8 repeaters, with actual device capacity determined by the connected control panel. Its SDI2 integration allows wireless devices to function as monitored security points alongside compatible hardwired sensors in residential, commercial, and institutional intrusion detection systems.

The B812 features two internal antennas designed for spatial and polarization diversity to improve radio signal reception. Integrated RF diagnostics support wireless signal assessment during installation and maintenance, while radio frequency interference and jamming detection provide additional system monitoring. Cover and wall tamper switches report unauthorized opening or removal of the receiver enclosure. An external status LED provides visual operating information, and a rear-mounted address switch allows installers to configure the receiver for communication with the control panel. Wireless device supervision and diagnostic reporting help identify communication problems, sensor faults, and tamper events through the connected security system.

The receiver operates on 10-14 VDC, with a nominal 12 VDC supply and maximum current consumption of 40 mA. Power and communication are provided through the Bosch SDI2 bus, eliminating the need for a separate radio receiver power supply in compatible installations. The B812 supports device enrollment through compatible control panel programming procedures, including wireless point identification and signal testing. Its 433.42 MHz RADION communication supports compatible wireless transmitters and repeaters, allowing installers to position intrusion detection devices where hardwired connections are impractical. The receiver requires a supported Bosch SDI2 control panel, and compatibility with individual RADION devices must be verified against the applicable system documentation.

The Bosch B812 wireless receiver features an indoor wall-mounted enclosure measuring approximately 8.4 inches high x 5.48 inches wide x 1.3 inches deep. It operates in temperatures from -4 F to 131 F (-20 C to 55 C) and supports relative humidity up to 93%, non-condensing. The enclosure provides IP41 protection and includes mounting provisions for the receiver and its tamper detection components. Manufacturer-listed certifications include UL 1023, UL 985, UL 2610, and FCC Part 15 Class B. Designed for compatible Bosch RADION security installations, the B812 provides supervised wireless expansion through the SDI2 bus without requiring individual wiring runs to each wireless security device.