A
PPENDIX
A:C
ONNECTION
D
ATA
P
ACKET
L
IGHT
N
ETWORKS
PL-1000RO
3.3
I
NSTALLATION AND
C
ONFIGURATION
M
ANUAL
C
ONFIDENTIAL AND
P
ROPRIETARY
I
NFORMATION
.
A
LL RIGHTS RESERVED
.
P
AGE
181
Table 52: ALARM Interface, Pin Function
Pin
Designation
Function
1
ALARM Normally Open
(ALARM1_NO)
In normal operation, pin 6 (ALARM Common) is
internally connected to pin 2 (ALARM Normally
Closed).
Upon a Major alarm event, the internal connection of
pin 6 (ALARM Common) is switched to this pin (pin 1).
2
ALARM Normally Closed
(ALARM1_NC)
In normal operation, pin 6 (ALARM Common) is
internally connected to this pin (pin 2).
Upon a Major or Critical alarm event, the internal
connection of pin 6 (ALARM Common) is switched to
pin 1 (Alarm Normally Open)
6
ALARM Common
(ALARM1_COM)
Common signal
3
Internally connected to GND.
7
ALARM IN 1
Input External Alarm
8
ALARM IN 2
Not connected
4*
ALARM Normally Open
(ALARM2_NO)
In normal operation, pin 9 (ALARM Common) is
internally connected to pin 5 (Alarm Normally Closed).
Upon a Major alarm event, the internal connection of
pin 9 (ALARM Common) is switched to this pin (pin 4).
5*
ALARM Normally Closed
(ALARM2_NC)
In normal operation, pin 9 (ALARM Common) is
internally connected to this pin (pin 5).
Upon a Major alarm event, the internal connection of
the pin 9 (ALARM Common) is switched to pin 4
(ALARM Normally Open).
9*
ALARM Common
(ALARM2_COM)
Common signal
* The pin will be implemented in a future software release.