Wiring The Keypad - Interlogix TruVision 21 User Manual

Chapter 2: Physical installation
4. Connect to a network.
5. Connect to an optional eSATA device such as
SATAN HDD, CD/DVD-RM.
6. Connect to a power cord.
7. Connect to speakers for audio output.
8. Connect to a VGA monitor.
9. Connect to an HDTV. The HDMI connection
supports both digital audio and video.

Wiring the keypad

The keypad uses RS-485 simplex wiring. The signal is transferred by a single twisted
pair line. A shielded STP CAT5 network cable is recommended. Ground one end of the
cable, either the first or last device on the RS-485 line.
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 2 below.
Figure 2: RS-485 bus serial wiring (KTD-405 keypad shown)
1. Keypad
2. I/O box
Use an RS-485 signal distributor for a star wiring configuration. See Figure 3 on page 7.
6
13. Connect to a keyboard (KTD-405 shown).
14. Connect up to 16 alarm inputs.
15. Connect up to four alarm relay outputs.
16. Connect to ground.
17. 8/16/32 PoE ports.
3. See section "RS-485 ports" on page 8
TruVision NVR 21 (SP) User Manual