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Serial Interface Specifications
74 Apollo SL30 Installation Manual
Received an unknown message.
NAV RECEIVER STATUS
This message is used to output the current status of the NAV receiver. It will be output upon
request or whenever the status changes.
Message format:
“V”.................Message class. This is a VHF NAV message.
“28”................Message identifier.
mk ..................Active NAV frequency: m = MHz, where m + 30h = desired MHz
frequency in the range of 108 to 117 MHz.
k = desired frequency in kHz, where k = (desired frequency / 25 kHz) +
30h, with desired frequency in range of 000 to 975 kHz in 50 kHz steps.
mk ..................Standby NAV frequency: m = MHz, where m + 30h = desired MHz
frequency in the range of 108 to 117 MHz.
k = desired frequency in kHz, where k = (desired frequency / 25 kHz) +
30h, with desired frequency in range of 000 to 975 kHz in 50 kHz steps.
s......................Status: “N” = Normal mode, “M” = Monitor mode
Example message:
$PMRRV28E4?PM<chksm><CR><LF>
Active NAV frequency is 117.100 MHz, Standby NAV frequency is 111.800 MHz, receiver is in
monitor mode.
NAV AUDIO MODE
This message is used to output the current NAV audio mode. There are three possible settings
for this mode. The first is “OFF”, which suppresses all of the NAV audio. The second is
“IDENT”, which will suppress the voice portion of the NAV audio signal and emphasize the
Morse Code station identifier. The third choice is “VOICE”, which will emphasize voice signal
and suppress the Morse Code station identifier.
Message format:
“V”.................Message class. This is a VHF NAV message.
“29”................Message identifier.
a......................NAV audio mode. “0” = OFF, “I” = IDENT, “V” = VOICE
Example message:
$PMRRV29I<chksm><CR><LF>
The current NAV Audio mode is “IDENT”.