Garmin GNC 255 Installation Manual - page 97
190-01182-02
GTR 225/GNC 255 TSO Installation Manual
Rev. B
Page B-17
Example message:
$PGRMV25VISLE
The decoded station identifier is valid and is “ISLE “.
B.2.4.2.10 Communications Error
This message is used to indicate a communication error.
Message format (GNC NAV error):
“V” ..........................Message class. This is a GNC NAV message.
“27”.........................Message identifier.
e...............................Error code: (ASCII)
“0” = input message checksum error.
“1” = unknown message.
“2” = error or mismatch in message data.
Message format (GTR/GNC COM error):
“C” ..........................Message class. This is a GTR/GNC COM message.
“05”.........................Message identifier.
e...............................Error code: (ASCII)
“0” = input message checksum error.
“1” = unknown message.
“2” = error or mismatch in message data.
Example messages:
$PGRMV271
Received an unknown NAV message.
$PGRMC050
Received a COM message with an invalid checksum.
B.2.4.2.11 NAV Receiver Status
This message is used to output the current status of the NAV receiver. It will be output at the configured
rate, and will output faster than the configured rate when the NAV receiver status changes.
Message format:
“V” ..........................Message class. This is a GNC NAV message.
“28”.........................Message identifier.
mk ...........................Active NAV frequency: m = MHz, where m + 30h = desired MHz frequency
in the range of 108 to 117MHz.
k = desired frequency in KHz, where k = (desired frequency / 25KHz) + 30h,
with desired frequency in range of 000 to 950KHz. Note that valid NAV
frequencies only lie on 50KHz boundaries (i.e. 108.00, 108.05, 108.10, etc.).
mk ...........................Standby NAV frequency: m = MHz, where m + 30h = desired MHz frequency
in the range of 108 to 117MHz.