Garmin GNC 255 Installation Manual - page 99
190-01182-02
GTR 225/GNC 255 TSO Installation Manual
Rev. B
Page B-19
Table B-3. Input Message Summary
Table B-4. Output Message Summary
Class
Ident
Description
Response
Comment
C
00
Set Active COM Frequency and
Transceiver Function
COM
Transceiver
Status
C
01
Set Standby COM Frequency
and Transceiver Function
COM
Transceiver
Status
C
02
Set COM Audio Items
COM Audio
Status
C
06
Request COM data
GTR/GNC COM
Status
V
24
Request Data Output
GNC NAV
Status
V
27
Set Active VOR/LOC Frequency
and Receiver Function
NAV Receiver
Status
V
28
Set Standby VOR/LOC
Frequency and Receiver
Function
NAV Receiver
Status
V
31
Set NAV Audio Mode
NAV Audio
Mode
V
34
Set OBS Value
Notes
Class: “C” = GTR/GNC COM message, “V” = GNC NAV message.
Class
Ident
Description
Length
Output Rate
Comment
V
20
Reset Status
12
At startup / Upon request
V
21
CDI, VDI and Flags
18
High
V
22
Decoded OBS setting
16
High
V
23
Radial From Active VOR
17
High
V
25
Decoded Station Identifier
18
Low
V
27
Communications Error
13
When error detected
V
28
NAV Receiver Status
17
status change / Low
V
29
NAV Audio Mode
13
Upon request / status
change
V
35
Comm Transceiver Status
18
status change / Low
V
36
Comm Software Version
17
Upon request
Notes
Length is in bytes and includes the “$” start of message character and the
sequence.