Interlogix NVR 21 (S/P) User Manual Manual do Utilizador descarregar pdf (Página 14)

Chapter 2: Installation

8 TruVision NVR 21(S/P) User Manual

Figure 4: Expanding the system with an RS-485 signal distributor

1. Keypad

2. I/O box

3. RS-485 distributor

4. See section “RS-485 ports” on page 8

Caution: Most signal distributors are unidirectional. This means that the signal only

flows from the input towards the outputs. Consequently it is not possible to connect

several keypads.

See section “RS-485 ports” below to configure the RS-485 port communication settings.

RS-485 ports

There are two RS-485 ports on the rear panel of the recorder. See Figure 5 below for

the serial pin outs.

• Dome RS-485:

A and B: Connect pan, tilt, zoom control of PTZ dome cameras. A = +, B = -

C and D: Not used

G: Ground of dome camera

G: Ground of keypad

• Keyb: Connect the keypad.

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Interlogix NVR 21 (S/P) User Manual Manual do Utilizador Página 14