DAVIS Alarm Output Module - Manual (Page 7)

Alarm Output Module Operation Page 7
Basic AOM Information
The AOM outputs are updated by the console at intervals of approximately 3
seconds. The data are sent twice and checked for agreement before being out-
put, providing a measure of error detection. Note the following information
concerning the jumpers, LEDs, switches, and jacks found on the AOM board:
✦ Normally-Open/Closed Jumper (J7)
Jumper J7 enables the user to select whether the output “contacts” are
normally-open or normally-closed. One jumper selects the mode for all
four contacts.
✦ Yellow LED Indicator (LOAD)
The yellow LED flashes briefly for each successful transfer of alarm data
from the console to the output contacts (LOAD pulse).
✦ Green “Status” LED Indicator and Contact Output (OK)
The green LED is lighted and the contact is closed to indicate that the fol-
lowing are true:
✦ Power is on at the
AOM.
✦ A correct update has
been made within the
last 10 seconds.
✦ The “enable” switch is
set to “ON.”
✦ Alarm Outputs (A, B, C, D) and Red LED Indicators
The AOM has four alarm output contacts (A, B, C, D) to which you may
connect external devices. Each output contact may be connected to a dif-
ferent alarm signal by connecting the jumper wire from the desired
alarm output to the appropriate pin jack on jumper J3 (See “Program-
ming the AOM” on page 9). The red LED indicators display the status of
each of the four selected alarm signals. When the LED is lighted, the out-
put is closed (if the ENABLE switch is set to ON).