18
Cypress Suprex® RS-485 Series - Accessory I/O - LED I/O
For access control panels with a LED Output signal, the SPX-7500 is able to transmit this signal to the reader with the
LED Input and LED Output pins. The LED In pin is a digital input and the LED Out pin is a digital output. The LED In pin
has two states, 5V (high or normal) and 0V (low or active). The LED Out pin will mirror the state of the LED In pin.
The LED I/O Signal Diagram below shows how this signal is passed through he SPX-7500.
Ground
LED Out
Data1
Data 0
N.O.
COM
Access
Control
Panel
Card
Reader
Power
Ground
LED IN
Data 1
Data 0
LED I/O Signal Diagram
+8 to +16 VDC
Ground
exp(+)
exp(-)
+5V Out
Relay 4 Input
Relay 3 Input
LED Out
D1/Data In
D0/Clock In
Relay 2 N.O.
Relay 2 Com
Relay 2 N.C.
Relay 1 N.O.
Relay 1 Com
Relay 1 N.C.
Ground
Aux Input
Not Used
Not Used
+8 to +16 VDC
Ground
exp(+)
exp(-)
+5V Out
P R 4
P R 3
LED In
D1/Data Out
D0/Clock Out
Relay 4 N.O.
Relay 4 Com
Relay 4 N.C.
Relay 3 N.O.
Relay 3 Com
Relay 3 N.C.
Ground
Aux Output
Relay 2 Input
Relay 1 Input
Central
Remote
