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AutoDome Power Supply Boxes Cable and Wire Standards | en 29
Bosch Security Systems, Inc. Installation Guide F.01U.250.895 | 1.0 | 2011.08
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.
The figure below illustrates the connections necessary for
Biphase operation.
Figure 3.2 Connections for Biphase Operation
CAUTION!
The Biphase shield must be connected to the head end only.
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 100 Ω
Terminal Connector Screw terminals
Voltage 4 Vp-p
1 C- (Biphase) 7 AutoDome Data In/Out
2 C+ (Biphase) 8 Head End Biphase
3 Earth Ground 9 P105/P106 Connector in Power Supply
Box
4 RxD 10 C- (Biphase)
5 TxD 11 C+ (Biphase)
6 Signal Ground 12 Shield
100 Ω