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4.3.2
ARINC 429
The GRA 5500 provides two independently configurable ARINC 429 output interfaces which conform to
ARINC 429 electrical specifications when loaded with up to 5 standard ARINC 429 receivers.
In non-GIFD (retrofit) installations, GRA 5500 altitude information is output from this interface. The
ARINC 429 outputs can be configured for low speed (12.5 kbps) or high speed (100 kbps) operation.
ARINC 429 OUT 1 A
ARINC 429 OUT 1 B
ARINC 429 OUT 2 A
ARINC 429 OUT 2 B
The ARINC 429 labels in Table 4-5 can be output from the unit and are configurable via the GRA 5500
Retrofit Installation Tool (see
Label
164
165
377
During "No Computed Data" conditions (operation above 2550 ft AGL or insufficient return signal
conditions below 2550 ft AGL) the sign/status matrix bits of Label 164 and Label 165 are set to indicate
"No Computed Data" and the altitude bits of each label are set to indicate 4000 ft. If a unit fault is found
during normal operation, the sign/status matrix bits of Label 164 are set to indicate "Fail" and the altitude
bits are set to indicate 4000 ft. During a "Fail" state Label 165 is not transmitted.
4.3.3
Configuration Module
Use of a configuration module in Garmin Integrated Flight Deck (GIFD) installations is not required. For
non-GIFD (retrofit) installations, use of a configuration module is optional to retain configuration settings
outside of the individual LRU.
CONFIG MODULE DATA**
CONFIG MODULE CLOCK**
CONFIG MODULE GROUND**
CONFIG MODULE POWER**
**Signals have ESD (Electrostatic Discharge) protection, but no lightning protection.
GRA 5500 Installation Manual
Page 4-4
Table 4-4 ARINC 429
Pin Name
Section
3.7.2):
Table 4-5 ARINC 429 Output Labels
Description
Radio Altitude (BNR format)
Radio Altitude (BCD format)
Equipment Identification
Table 4-6 Configuration Module
Pin Name
Pin
I/O
52
Out
55
Out
10
Out
4
Out
Output Data Rate/Period
20 Hz/50 msec
20 Hz/50 msec
20 Hz/50 msec
Pin
I/O
40
Out
47
Out
48
--
53
Out
190-01277-00
Rev. A
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