Garmin G3X - C.8 CNI Message Format

190-01115-01 G3X™/G3X Touch™ Avionics Installation Manual
Rev. AV Page C-11
C.8 CNI Message Format
The CNI category contains one message format. The CNI message format is transmitted approximately
once per second. Table C-10 explains the message CNI format.
Table C-10 CNI Message Format
Field Name Offset Width Units Notes Min Max
Escape character 0 1 ‘=’
Sentence ID 1 1 ‘C’
Sentence version 2 1 ‘1’
UTC hour 3 2 hours 00 23
UTC minute 5 2 minutes 00 59
UTC second 7 2 seconds 00 59
UTC second fraction 9 2 10 ms 00 99
COM1 active frequency 11 6 KHz 118000 136990
COM1 standby frequency 17 6 KHz 118000 136990
COM1 transceiver status 23 1
‘T’ = Transmit
‘M’ = Monitor
‘R’ = Receive
‘_’ = no activity
COM1 monitor enabled 24 1
0 = disabled
1 = enabled
0 1
COM1 fail 25 1
0 = no status failure
1 = status failure
0 1
COM1 squelch bypass 26 1
0 = not bypassed
1 = bypassed
0 1
COM1 volume 27 3 000 100
COM2 active frequency 30 6 KHz 118000 136990
COM2 standby frequency 36 6 KHz 118000 136990
COM2 transceiver status 42 1
‘T’ = Transmit
‘M’ = Monitor
‘R’ = Receive
‘_’ = no activity
COM2 monitor enabled 43 1
0 = disabled
1 = enabled
0 1
COM2 fail 44 1
0 = no status failure
1 = status failure
0 1
COM2 squelch bypass 45 1
0 = not bypassed
1 = bypassed
0 1
COM2 volume 46 3 000 100