Interlogix NVR 21 (S/P) User Manual - Manual (Page 13)

Chapter 2: Installation
TruVision NVR 21(S/P) User Manual 7
Figure 3: Star wiring with RS-485 signal distributor
Correct:
1. Keypad
2. I/O box 3. RS-485 distributor
4. See section “RS-485 ports” on page 8
Incorrect:
1. Keypad
2. I/O box 3. See section “RS-485 ports” on page 8
Use an RS-485 signal distributor to increase the maximum number of devices on the
bus as well as the total range. Each distributor output provides another RS-485 bus,
extending the output an additional 1200 m. Up to 31 recorders can be connected to
each output. See Figure 4 below.
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