Garmin GTR 200 Installation Manual page 76

B.2.3.2 Software Version
This message is used to output the software version string.
Message format:
"MRR" ............ Company identifier.
"C"................... Message class.
"03" ................. Message identifier.
vvvv................. Software version in ASCII
Example message:
$PMRRC030200<chksm><CR><LF>
Software version is 2.00.
B.2.3.3 Communications Error
This message is used to indicate a communications error. When possible, the company identifier and
message class will match the company identifier and message class of the offending message.
Message format:
iii ..................... Company identifier.
c ....................... Message class: "05" for COMM messages; "27" for NAV messages.
nn..................... Message identifier.
e ....................... Error code: (ASCII)
Example message:
$PGRMC051<chksm><CR><LF>
Received an unknown message using company ID "GRM" and message class "C".
GTR 200 Installation Manual
Page B-12
0 = input message checksum
1 = unknown message
2 = error or mismatch in message data
190-01553-00
Rev. B