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12 Pelco Manual C543M-A (7/03)
A single Alarm port is provided with each matrix bay which facilitates a relay output
(contact closure) to operate remote alarm circuitry in the event of a system malfunc-
tion. The relay operates in conjunction with the front panel fault LEDs (discussed
later in Section 3.4) to notify personnel when a hardware problem occurs. The
Alarm Relay contact closure will activate (close) if there is:
1. A power supply failure.
2. A frame fault including fuse failure on the Input card.
3. An Output card failure.
4. A communication fault with an Input or Output card.
If wiring to this port, use the 4-pin audio connector supplied with the unit (refer to
Figure 6 and Table A).
Table A. Alarm Port Pin Definition
Pin Description
1 Relay One Common
2 Relay One Normally Open
3 Not Used
4 Not Used
Figure 6. Alarm Connector
COMMON
NORMALLY OPEN
ALARM PORT
4-PIN DIN SOCKET
ON THE REAR LEFT PANEL
OF THE VMB