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SmartRelay 3 LED reader
Reader connection
A
B
-
+
EN
Reader
Controller
SREL3 controller connec-
tion
A1/A2/A3
B1/B2/B3
-
+
Reader
Controller
Alternative circuit
Signal
RS-485: Data line A
RS-485: Data line B
GND. Used to establish the
common ground reference
potential for the data lines.
Any ground connection to
the SREL3 controller.
V
. Connection for power
IN
supply (external or via con-
troller).
4. Connections
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