ZK S900 - Exit-Button Connection; Alarm Connection

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2.2.2 Exit-button connection
Install exit button approximately 4 to 5 feet from the ground. Make sure
that the exit-button is properly connected to the corresponding terminals
on the back of the S900. (Unused exposed end of cable should be cut off
and wrapped with insulating tape.) Be sure no electromagnetic
disturbance occurs as a result of the installation.
2.2.3 Alarm connection
The S900 can trigger alarms and monitoring systems (only supports 12V
DC buzzers).