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54
en | Cable and Wire Standards
4.4
Control-only Cables
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 110 Ω terminal resistor.
The AutoDome has a 110 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.
(BIPHASE) C- 1
(BIPHASE) C+ 2
EARTH GROUND 3
SIGNAL GND 6
Fig. 4.2 Connections for Biphase Operation
In a daisy chain configuration, where multiple domes are connected in series, the 110 Ω resis-
tor must be removed from all but the last dome. You can daisy chain a maximum of eight (8)
AutoDomes.
(BIPHASE) C- 1
(BIPHASE) C+ 2
EARTH GROUND 3
SIGNAL GND 6
Fig. 4.3 Connections for a Daisy Chain Configuration
F01U010921 | 1.0 | 2006.10
STP - Shielded Twisted Pair
1524 m (5000 ft) Belden 8760 recommended
31.25 KHz
1.02 mm (18 AWG)
110 Ω
Screw terminals
4 Vp-p
AutoDome
AutoDome
Data In/Out
Data In/Out
110 ohm
NC X
RXD 4
TXD 5
P105/P106
P105 / P106
Connector
Connector
Last Dome
Last Dome
Data In/Out
Data In/Out
110 ohm
NC
RXD 4
TXD 5
P105/P106
P105 / P106
Connector
Connector
Installation Manual
AutoDome Modular Camera System
Head End
Head End
Biphase
Biphase
Dome
Dome
Dome
Dome
2
3
3
2
C-
C-
C+
C+
S
S
X
X
NC
NC
C-
C+
SHIELD
Dome
Head End
Head End
Dome
1
Biphase
Biphase
1
C-
C-
C+
C+
S
X
X
NC
SHIELD
Bosch Security Systems, Inc.
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