RI
DTR
CTS
TXD
RTS
RXD
DSR
DCD
REF
IN22
REF
IN21
PWR (300 mA)
GND
NC
C
NO
SHLD
OUT23
OUT22
OUT21
PWR (300 mA)
DATA0
DATA1
REF
RXD
TXD
OUT02
OUT01
REF
IN02
REF
IN01
REF
IN12
REF
IN11
PWR (300 mA)
GND
NC
C
NO
SHLD
OUT13
OUT12
OUT11
PWR (300 mA)
DATA0
DATA1
GND
REF
+RS485
-RS485
REF
SHLD
COM
EARTH
+24VDC
GND
Reserved for Future Use
Reader 1
Signal Descriptions
Reader 2/General Purpose Output 4
Reader 1/General Purpose Output 4
Reader 2/General Purpose Input 3
Reader 1/General Purpose Input 3
Reader 1 – Auxiliary Access/General Purpose Input 2
Reader 1 – Door Input/General Purpose Input 1
Reader 1 – Device Ground
Reader 1 – Door Strike/General Purpose Output 5
Reader 1 – Shunt Output/General Purpose Output 3
Reader 1 – Green LED/General Purpose Output 2
Reader 1 – Red LED/General Purpose Output 1
Reader 1 – Door
To Enclosure Power Supply and/or Next RDR2S
Reader 2 – Auxiliary Access/General Purpose Input 2
Reader 2 – Door Input/General Purpose Input 1
Reserved for Future Use
Reader 2 – Door Strike/General Purpose Output 5
Reader 2 – Shunt Output/General Purpose Output 3
Reader 2 – Green LED/General Purpose Output 2
Reader 2 – Red LED/General Purpose Output 1
Reader 2 – Door
To Controller and/or Next RDR2S
Reader 2
Signal Descriptions
Reader Mode Enabled/SIO Mode Enabled
(CK721-A/CK721/CK720/CK705 Controllers)
Reader 2 – Auxiliary (Output) Power
Reader 2 – Device Ground
Reader 2 – Door Shield
Reader 1 – Device (Output) Power
Reader 1 – Door Shield