Figure 9: Sample Output Alarm-Reporting Device; Table 6: Alarm Relay Contact Functions - Juniper acx1000 User Manual

ACX1000 and ACX1100 Universal Access Router
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Table 6: Alarm Relay Contact Functions

Contact
Name Contact Name
Contact 1 Normally Open (NO)
Normally Closed (NC)
Contact 2 Reference (REF)
Figure 9 on page 28 shows an example of a wiring diagram for a simple output
alarm-reporting device. In this case the device is a light bulb that illuminates when the
device encounters a condition that activates the red alarm LED and relay contacts. The
alarm relay contacts can also be used to activate other devices such as bells or buzzers.

Figure 9: Sample Output Alarm-Reporting Device

Figure 10 on page 29 shows an example of a wiring diagram for a simple input
alarm-reporting device. In this case the push button switch is an alarm sensor that triggers
an input alarm when a door-open condition occurs.
Function
Current is not flowing through Contact 1 and Contact 2
[REF] when operating normally. When the current flows,
the closed alarm is generated.
Current is flowing through Contact 1 and Contact 2 [REF]
when operating normally. When the current stops
flowing, the open alarm is generated.
Provides the current path for the external alarm-reporting
device and functions as a reference or negative potential
terminal for Contact 1.
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