Appendix B - Serial Interface Specifications
B-12
560-0982-00 Rev D
Apollo CNX80 Installation Manual
Example Message
$PMRRC0511IT64<cr>
The above example message outputs a ground frequency type, 121.900 MHz.
B.2.1.4.3
Remote VOR List
The following two commands work together in allowing the CNX80 to provide a list of VOR frequencies to
a remote device (such as the SL30). The CNX80 will send a sequence of Remote VOR Input commands
(message identifier 20). When all of the VOR Input commands have been sent, the CNX80 will send a
Remote VOR List Trailer command (message identifier 21) to terminate the list. The transmitted list
should not be considered complete by remote device until it receives the trailer message. The remote device
should maintain a single remote VOR list, so each list transmitted will replace any previous list. There
may be up to twenty entries in the remote VOR list.
B.2.1.4.3.1
Remote VOR Output
This output is used to provide VOR frequency data that is used for the remote recall function.
The data consists of five characters for the VOR station identifier followed by two characters defining the
VOR frequency.
Message format:
“V”
Message Class. This is a VHF NAV message.
“20” Message
Identifier.
vvvv
VOR station identifier. Note that if the station identifier is less than four characters, then
the trailing characters will be filled with spaces. Station Identifiers are restricted to using
ASCII characters 0-9 and A-Z.
mk
Frequency: m = MHz, where m = desired MHz frequency – 30h, with the desired
frequency ranging from 108 to 117, or 3Ch to 45h; k = kHz, where k = (desired kHz offset
/ 25 kHz) + 30h, with desired frequency range of 000 to 975 kHz in 50 kHz steps, or the
even numbers from 30h to 56h. Note that the field will be checked to ensure that it is in
range and a valid VOR frequency. Frequencies used for localizers, which are in the range
of 108.10 to 111.95 MHz, will not be accepted in this message type.
Example message:
$PMRRV20UBG<Sp>E@<chksm><CR><LF>
VOR station identifier is “UBG ”, VOR frequency is 117.400 MHz.
B.2.1.4.3.2
Remote VOR List Trailer
This output command marks the end of a VOR list sent by the CNX80.
Message format:
“V”
Message Class. This is a VHF NAV message.
“21” Message
Identifier
Summary of Contents for Apollo CNX80
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