Garmin International Inc 0181200 Manuel D’Utilisation
GRA 5500 Installation Manual
190-01277-00
Page 4-6
Rev. A
4.4.2 Altitude Alert (Annunciator) Outputs
The GRA 5500 provides two active-low annunciator outputs for use as “altitude alerts” or altitude trip
points to annunciate when the GRA 5500 indicates a radar altitude below the configured trip point for each
altitude alert pin. The altitude value for each altitude alert pin is configurable via the GRA 5500 Retrofit
Installation Tool (see
points to annunciate when the GRA 5500 indicates a radar altitude below the configured trip point for each
altitude alert pin. The altitude value for each altitude alert pin is configurable via the GRA 5500 Retrofit
Installation Tool (see
for further information on accomplishing configuration).
Each altitude alert pin will annunciate the active state if the altitude value output from the GRA 5500 is
less than the configured value for the respective altitude alert pin and the status of the altitude is “Normal”.
If the GRA 5500 indicates a “No Computed Data” or a “Fail” condition, both altitude alert pins will revert
to the inactive state. Both altitude alert pins will also revert to the inactive state whenever the manually-
initiated self-test functionality is active (See
less than the configured value for the respective altitude alert pin and the status of the altitude is “Normal”.
If the GRA 5500 indicates a “No Computed Data” or a “Fail” condition, both altitude alert pins will revert
to the inactive state. Both altitude alert pins will also revert to the inactive state whenever the manually-
initiated self-test functionality is active (See
elf-test
functionality).
ACTIVE: 0 V ≤ Vout ≤ 0.5 V, or Rout ≤ 10 ohms, sinking up to 500 mA
INACTIVE: Rout ≥ 100k ohms to ground, withstanding up to +36 VDC
Table 4-9 Alert Outputs
Pin Name
Pin
I/O
RADAR ALTITUDE ALERT OUT* 2
17
Out
RADAR ALTITUDE ALERT OUT* 1
32
Out
*Denotes Active Low
DRAFT