Specifications

BP4 Bi-phase card | Installation and Operation Manual AAAEN| 8
Bosch Security Systems Issue 1
CHAPTER 2 MIC-BP4 Bi-phase Converter Card
Picture 1 – The MIC-BP4 Bi-phase converter card for MIC400 series power
supplies.
The Bi-phase converter card allows Bosch control systems with Bi-phase output to
control up to eight (8) non-IR MIC400 series camera via their associated power
supply units.
Bi-phase Telemetry Specifications
Shielded 2-wire, half-duplex, multi-drop, 5000 ft. cable limit, 18AWG gauge needed
for 500ft distance.
Bi-phase is the standard Bosch protocol used to send Pan/Tilt/Zoom control over
2-wire shielded twisted pair (STP) terminated with an 110Ω terminal resistor.
Figure 1 below illustrates the connections necessary for Bi-phase operation.
Figure 1: Connections for Bi-phase
Cable Type STP - Shielded Twisted Pair
Distance 1524 m (5000 ft) Belden 8760 recommended
Transmission Rate 31.25 KHz
Gage 1.02 mm (18 AWG)
Termination
110 Ω
Terminal Connector Screw terminals
Voltage 4 Vp-p
1
Bi-phase to RS485 Converter PCB
2
Bi-phase output on Control System
3
HD2 Screw Terminal Header