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AutoDome Power Supply Boxes
3.4
Control-only Cables
3.4.1
Controlling the AutoDome via Biphase
(Shielded 2-wire, half-duplex, multi-drop, 5000 ft. cable limit)
Biphase is the standard Bosch protocol used to send Pan/Tilt/
Zoom control over 2-wire shielded twisted pair (STP)
terminated with a 100 Ω terminal resistor.
The AutoDome has a 100 Ω termination resistor between the
Biphase C+ and C- terminals.
CAUTION!
The Biphase shield must be connected to the head end only.
Cable Type
Distance
Transmission Rate
Gage
Termination
Terminal Connector
Voltage
The figure below illustrates the connections necessary for
Biphase operation.
Figure 3.2 Connections for Biphase Operation
1 C- (Biphase)
2 C+ (Biphase)
3 Earth Ground 9
4 RxD
5 TxD
6 Signal Ground 12 Shield
Bosch Security Systems, Inc.
STP - Shielded Twisted Pair
1524 m (5000 ft) Belden 8760 recommended
31.25 KHz
1.02 mm (18 AWG)
100 Ω
Screw terminals
4 Vp-p
100 Ω
7
AutoDome Data In/Out
8
Head End Biphase
P105/P106 Connector in Power Supply
Box
10 C- (Biphase)
11 C+ (Biphase)
Installation Guide
Cable and Wire Standards | en
F.01U.250.895 | 1.0 | 2011.08
29
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