TruVision DVR 40 User Manual
9
Wiring the TVK-505U keypad
The keypad uses RS-485 simplex wiring. The signal is transferred by a single twisted pair line.
An unshielded CAT5 network cable is recommended for normal applications. Use a shielded
CAT5 cable if the cables could be exposed to interference.
The maximum number of devices that can be installed in one bus is 255, with a maximum cable
length of 1200 m. The cable length can be expanded using a signal distributor.
Both the first and the last device in series should be terminated with 120 Ohm resistance to
minimize line reflections. See Figure 7 below.
Figure 7: RS-485 bus serial wiring
1. Keypad; 2. I/O box; 3. TVR 40
Monitor connections
Connect the unit to the monitors via 75-ohm video coaxial cables with BNC connectors. The unit
provides a 1 Vpp CVBS signal.
Summary of Contents for TruVision DVR 40
Page 1: ...P N TVR40 uman EN REV 2 0 ISS 30SEP11 TruVision DVR 40 User Manual...
Page 6: ...iv...
Page 16: ...10 TruVision DVR 40 User Manual...
Page 26: ...20 TruVision DVR 40 User Manual...
Page 46: ...40 TruVision DVR 40 User Manual...
Page 76: ...70 TruVision DVR 40 User Manual...
Page 84: ...78 TruVision DVR 40 User Manual...
Page 114: ...108 TruVision DVR 40 User Manual...
Page 118: ...112 TruVision DVR 40 User Manual...
Page 122: ......