Garmin GTR 200 Installation Manual page 73

B.2.2.5 Remote Frequency Identifier Lookup Table
The following two messages work together in allowing remotely connected devices to provide frequency
identifier lookup information. The host device will send a Set Remote Frequency Table Entry message to
add entries to the table, and Delete Remote Frequency Table Entries message to remove entries from the
table. The table should be presorted by the host in order of frequency and not have any empty entries
between the first and last entry (empty entries at the end are ok). When manually tuning a frequency the
table will be checked for a matching frequency, and if found the frequency identifier for the entry will be
used. The table can hold at most 255 entries.
B.2.2.5.1 Set Remote Frequency Table Entry
This message is used to add entries to the remote frequency lookup table.
Message format:
"GRM".............Company identifier.
"C" ...................Message class.
"17"..................Message identifier.
nnn ...................List index (0-254)
mk ....................Frequency: m = MHz, where m = desired MHz frequency - 30h, ranging from 118
"0"....................8.33 KHz offset: (ASCII) 0 = 25 KHz frequency (.000)
iiii.....................Identifier string. Note that if the identifier string is less than four characters, left
f........................Frequency type (see Extended Frequency Type Enumeration).
Example message:
$PGRMC17025G>0KOJCA<chksm><CR><LF>
Add entry 119.250 MHz frequency, KOJC identifier, automated surface observing station type, at table
index 25.
B.2.2.5.2 Delete Remote Frequency Table Entries
This message is used to delete entries from the end of the remote frequency lookup table.
Message format:
"GRM".............Company identifier.
"C" ...................Message class.
"18"..................Message identifier.
nnn ...................Starting list index (0-254)
sss.....................Number of entries to delete, set to "255". As implemented this parameter is not
Example message:
$PGRMC18200255<chksm><CR><LF>
Delete frequency lookup table entries starting from index 200 to the end of the table.
190-01553-00
Rev. B
to 136 MHz, (i.e. 76h to 88h, A2h); k = (KHz offset / 25KHz) + 30h, ranging from
000 to 975KHz in 25 KHz steps.
justify the string and insert spaces for empty characters. An empty identifier string
(four spaces) is allowed. Identifiers are restricted to using ASCII characters 0-9
and A-Z.
used. All entries between nnn and the end of the table are deleted.
GTR 200 Installation Manual
Page B-9