Dahua ASR2101H-D, User Manual

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2
2 Wiring and Installation
2.1 Ports Overview
Table 2-1 Ports overview
Color Port Description
Red RD+ PWR (12 VDC)
Black RD– GND
Blue CASE Anti-tampering alarm signal
White D1 Wiegands transmission signal
(effective only when using
Wiegand protocol)
Green D0
Brown LED
Wiegand responsive signal
(effective only when using
Wiegand protocol)
Yellow RS–485_B
Purple RS–485_A
2.2 Wiring Requirements
●
Connect the card reader to the Wiegand ports or the RS-485 ports according to the type of the
card reader.
●
Select proper wires according to the requirements on wires.
Table 2-2 Wiring requirements of card reader
Type Impedance Requirements Length Requirements
RS-485 card reader
Connects RS-485 wires, and the
impedance of a single wire must≤ 10
Ω.
≤ 100 m. Above UL1061
24AWG shielded wires are
recommended.
Wiegand card reader
Connects Wiegand wires, and the
impedance of a single wire must≤ 2
Ω.
≤ 80 m. Above UL1061
18AWG shielded wires are
recommended.