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1.2 Wiring function and color codes
The following shows Signo 25B wiring functions and color codes.
Important: Bond the ground wires between the Signo 25B power supply and the panel power supply.
Important: The 19 pigtail wires should be cut to size for wall mounted installations. DO NOT cut the
Ethernet cable.
WARNING: Wiring the reader incorrectly may cause permanent damage to the reader.
Function group
Wire color
Function
AWG
Max. length¹
RS-485
Green
RS-485 A
24
4,000 ft
(1,219 m)
Tan
RS-485 B
Black
RS-485 Ground
Relay
(Reserved for
future use)
Gray
Relay - Common
22
500ft
(152 m)
Yellow
Relay - Normally Open
Orange
Relay - Normally Closed
Inputs
(Reserved for
future use)
Pink
REX Input (Supervised)
Gray
DPS Input (Supervised)
Black
Input Ground
Weigand Port
Green
D0
White
D1
Brown
RED
Orange
GREEN
Yellow
BUZ
Blue
HOLD
Violet
TPR
Black
Ground
DC Power
Red
Power +12 V
Black
Power Ground
Function group
Connector
Function
Cable
Max. length
Network
RJ45
socket
Ethernet
CAT5/5E/6
328 ft(100 m)
n
RS-485: Max. bus length: 4,000 ft - 24 AWG (1,219 m)
n
Max. length between nodes: 1,640 ft - 24 AWG (500 m)
n
Inputs: Reserved for controller mode only.
PLT-04900, B.1
6
March 2021
Powering
Trusted Identities
HID® Signo™ Biometric Reader 25B
User Guide