User's Manual Part 2

2-9
D-Sub 9-Pin Connector
The D-Sub 9-pin connector (labeled
DIAGNOSTIC
1
)
provides contact closure for major and latch system
alarm monitoring. The following table lists the
function of each pin on the D-sub 9-pin connector.
Alarms
LGC
ell
provides full Operations Alarm Maintenance and Provisioning (OAM&P).
The Main Hub senses then latches major alarms. An error latch provides historical
information for troubleshooting.
The major alarms and error latches are monitored with contact closures. Alarms can
be sent to remote locations (see
Section 5, Connectivity
and
Section 6,
Troubleshooting
). For details about alarm monitoring, see
Appendix E – Alarm
Report Monitor (ARM2000)
.
The two error connections, Major Error and Error Latch, are relay connections.
They are either open or short circuit (see the following table).
When you use these error pin connections, determine the error status by sending a
current of no more than 40 mA through the positive connection and returning it
through the negative connection. An error is indicated if current ceases to flow
through the error connection.
Pin Function
1+10 V (fused)
2 Not connected
3 Not connected
4 Error Latch (positive connection)
5 Error Latch (negative connection)
6 DC Ground
7 Major Error (positive connection)
8Error Reset
9 Major Error (negative connection)
Operation Major Error Error Latch
Proper Operation Short Circuit Short Circuit
Error Open Circuit Open Circuit
Proper Operation but had error and system latched;
alarm was not reset
Short Circuit Open Circuit