Specifications

Reference Guide
6-25
Interface Card Interface Card User Screens and Settings
6.3.7 Using the Node Port
The Node Port allows the system to report ACO (Alarm Cutoff) alarms to an external system
to alert the operator to critical situations. Using the ACO function keeps the alarm active until
manually cleared from the terminal.
The node port uses an RJ48 connector. Pins 3, 4, and 5 uses an RS485 compatible form
c-contact closure that can be used to report ACO alarms to an external system. Pins 1, 2, 6 and
7 are reserved for future use. Pin 8 is ground.
Connection of the ACO alarm interface to an external alarm device (such as a buzzer or light)
alerts you to problems with the system. Figure 6-13 shows a possible configuration connecting
a unit to a generic external alarm system. The nominal input is 5V and the short-circuit current
is 250mA.
The alarm interface is activated by the ACO setting. This will activate the device when a
designated alarm occurs.
Figure 6-13. Node Port ACO Alarm Interface
External Alarm System
Nodal Port
AMP
AMP
Common
Designation Pin #
1
2
ANO 3
ANC 4
ACOM 5
6
7
GND 8
ANO = Open to ACOM on Alarm
ANC = Closed to ACOM on Alarm