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56
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.
i
NOTICE! 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).
Wire Type
Distance
Maximum Baud Rate
Slide Switch
The following figure illustrates the connections for RS485 connections.
(BIPHASE) C- 1
(BIPHASE) C+ 2
EARTH GROUND 3
SIGNAL GND 6
Fig. 4.6 Connections for RS485 Operations
Fig. 4.7 Position of CPU Switch for RS485 Operation
F01U010921 | 1.0 | 2006.10
2-wire shielded twisted pair
1219 m (4000 ft)
57.6 kb
Toward LEDs (factory default)
AutoDome
AutoDome
Data In/Out
Data In/Out
RXD 4
110 ohm
TXD 5
P105 / P106
P105/P106
Connector
Connector
CPU Module Board
CPU MODULE BOARD
Installation Manual
AutoDome Modular Camera System
Head End
Head End
RS485
RS485
SWITCH
Switch
LOCATION
Location
Bosch Security Systems, Inc.
DATA +
DATA -
GND
LEDs
LEDs
RS485
RS485
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