Installation manual

Serial Interface Specifications
64 Apollo SL30 Installation Manual
SET NAV AUDIO MODE
This message is used to change 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.
“31”...............Message identifier.
a.....................NAV audio mode. “0” = OFF, “I” = IDENT, “V” = VOICE
Example message:
$PMRRV31I<chksm><CR><LF>
Set the current NAV Audio mode to IDENT.
SET OMNI-BEARING SELECT (OBS) VALUE
This message is used to set the OBS value used by the SL30 as the selected radial for computing
the course deviation from a VOR. This message will have no effect unless the SL30 is configured
to use the internal OBS source, or a serial OBS source.
Message format:
“V” ................Message class. This is a VHF NAV message.
“34”...............Message identifier.
vvv.................OBS Value in degrees, ranging from “000” to “359”.
Example message:
$PMRRV34310<chksm><CR><LF>
Set the OBS value to 310 degrees.
DME SENSOR INPUT
This message is used to input the range, ground speed, and ETA decoded from an external DME
sensor.