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94
en | Cable and Wire Standards
RS485 (2-wire (shielded), half-duplex, differential, multi-drop (32 nodes), 4000 ft cable limit)
RS485 is capable of controlling a true multi-drop network and is specified for up to 32 drivers
and 32 receivers on a single 2-wire bus. The AutoDome uses the 2-wire mode, although RS485
can be connected in a 2- or 4-wire mode.
NOTICE!
The wire shield must be tied to signal at both ends, if 2-wire twisted pair is used. After
connecting the wires for RS485 operation, make sure the slide switch on the main board to
the camera head is positioned toward the LEDs (default).
CAUTION!
Bosch recommends that multiple RS485 connections be arranged as a connected series of
point-to-point (multi-dropped) nodes, as a line or as a bus. It is not recommended to arrange
RS485 connections as a star, ring, or as a multiple-connected network. Star and ring
topologies may cause signal reflections or excessively low or high termination impedance.
Wire Type
Distance
Maximum Baud Rate
Gage
Wire Impedance
Slide Switch
The following figure illustrates the connections for RS485 connections.
Figure 5.6 Connections for RS485 Operations
1
2
3
4
5
6
F.01U.216.010 | 8.0 | 2011.02
2-wire shielded twisted pair
1219 m (4000 ft)
57.6 kb
0.511 mm (24 AWG)
120 W
Toward LEDs (factory default)
100 Ω
C- (Biphase)
C+ (Biphase)
Earth Ground
RxD
TxD
Signal Ground
Installation Manual
7
AutoDome Data In/Out
8
P105/P106 Connector
9
Head End RS485
10
Data +
11
Data -
12
Ground
VG4 Modular Camera Series
Bosch Security Systems, Inc.
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