6
Connec
tions
Connections
•
Cable should be AWG22~AWG16.
•
To connect the cable to Secure I/O 2, strip off approximately 5~6 mm of the end of the cable and connect
them.
Power
•
Do not share the power with the access controller.
•
If the power is shared by other devices, it should provide 9–18V and a minimum of 500 mA.
•
When using a power adapter, it should have IEC/EN 62368-1 certification.
RS-485
•
RS-485 should be twisted pair, and maximum length is 1.2 km.
•
Connect a termination resistor (120Ω) to both ends of a RS-485 daisy chain connection. It should be installed at both
ends of the daisy chain. If it is installed in the middle of the chain, the performance in communicating will deteriorate
because it reduces the signal level.
Termination
resistor
(120Ω)
DC
Power
RS-485 TRX+
RS-485 TRX-
Termination
resistor
(120Ω)
GND
Access controller
Access controller
