User's Manual

K02008-001 REV. A
3
2.3 Electrical Installation
2.3.1. Grounding
EM Reader
EM Reader
Earth
Ground
GND
Host
Controller
Linear
Power
Supply
Connect the reader directly to an earth ground. An earth ground can be established by driving a copper-
clad ground rod into the earth. Make certain the DC resistance between your established earth ground
and the system ground is 50 Ohms or less. If direct connection to a ground rod is not possible, connect
the reader to an earth-grounded cold water metal pipe (do not connect to copper fire sprinkler system
because it may have non-conductive couplings) or steel frames (building beams) that connect to earth.
In single or multiple reader installations, connect all readers to a single earth ground reference point.
2.3.2. Reader to Host Interface Wiring
EARTH GROUND
Linear
Power
Supply
+
-
Host
Controller
Wiegand
Suggested
Color Code
(White)
Color
Code
Reader Cable
Green
Brown
Black
Red
White
Splice Here
Extension Cable
Shield (Screen)
Data '1' In
Data '0' In
EM
reader
Blue
Orange
GND
(Green)
Do not use
(Red)
Do not use
Do not use
(Black)
Notes:
• The system must have a single earth ground point.