ARM Electronics C9TMX - Manual (Page 18)

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SELECT CHANNEL: Select the adjusting channel no (CH01-CH9). If select a
channel, and then the content of ALARM POLARITY and POP-OUT MONITOR
will be changed to the related contents.
ALARM POLARITY: Adjust the alarm channel polarity for each channel.
“N.O.”: Alarm is active low
“N.C.”: Alarm is active high
“OFF”: Alarm is not active no matter input signal is low or high.
POP-OUT MONITOR: Adjust the POP-OUT MONITOR for each channel.
“OFF”: don’t popup the alarm channel video to main or call Monitor.
“MAIN”: popup the alarm channel video to main monitor.
“CALL”: popup the alarm channel video to call monitor.
Note: Alarm input can be a contact type or TTL/CMOS level signal.