Bosch VG4-A-PSU1 Power Supply Unit for CCTV Cameras - Manual (Page 26)

26 en | Video and Control Cables (AUTODOME VG5-600 Camera Models ONLY)
Power Supply Units (AUTODOME7000, MIC7000
cameras)
2020-10 | | Installation Manual Bosch Security Systems, Inc.
RS-485 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 camera uses the 2-wire mode,
although RS-485 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 RS-485 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 RS-485 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
RS-485 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 2-wire shielded twisted pair
Distance 1219 m (4000 ft)
Maximum Baud Rate 57.6 kb
Gage 0.511 mm (24 AWG)
Wire Impedance 120 W
Slide Switch Toward LEDs (factory default)
The following figure illustrates the connections for RS-485 connections.
100 Ω
Figure 9.5: Connections for RS485 Operations
1 C- (Biphase) 7 AUTODOME Data In/Out
2 C+ (Biphase) 8 P105/P106 Connector in Power Supply Box
3 Earth Ground 9 Head End RS-485
4 RxD 10 Data +
5 TxD 11 Data -
6 Signal Ground 12 Ground