V A L A V I O N I C S L T D
N A V 2 0 0 0 N A V I G A T I O N S Y S T E M
I N S T A L L A T I O N A N D O P E R A T O R ’ S M A N U A L
Pre-Release Issue
Page 24 of 29
Sept. 2013
a……………..Transceiver function: N = normal, 0 = unchanged.
Example message:
$PMRRV29G4M<chksm><CR><LF>
This example command would set the standby VOR frequency to 119.100 MHz. This is
interpreted by noting that the ASCII ‘G’ corresponds with 47h, + 30h = 77h, converted to decimal
equals 119 for the MHz portions. The kHz portion converts ASCII ‘4’ to 34h, - 30h yields 4h x 25
kHz steps = 100 kHz.
Note:
The COM 2000 will check input frequencies for validity. An RS-232 serial error message
output will be generated if the frequency is invalid.
SET ACTIVE COM FREQUENCY AND TRANSCEIVER FUNCTION
This message is used to set the Active COM frequency as well as he COM transceiver function.
This message is only available in normal mode.
Message format:
“V” ..................Message class. This is a VHF NAV message.
“42”.................Message identifier.
mk ...................Active COMM frequency:
m = desired frequency in MHz in hexadecimal, where m = desired
frequency – 30h, with desired frequency in range of 118 to 136MHz,
or 162MHz.
k = desired frequency in kHz, where k = (desired frequency / 25kHz
steps.)
a = Transceiver function: N = normal, 0 = unchanged.
Example message:
$PMRRV42G4N<chksm><CR><LF>
This example command would set the active VOR frequency to 119.100MHz and place the
COMM radio in Normal receive mode. This is interpreted by noting that the ASCII ‘G’
corresponds with 47h, + 30h = 77h, converted to decimal equals 119 for the MHz portion. The
KHz portion converts ASCII ‘4’ to 34h, - 30h yields 4h, x 25KHz steps = 100 kHz.
Note:
The COM 2000 will check input frequencies for validity. An RS-232 serial error message
output will be generated if the frequency is invalid.
SET NAV OMNI-BEARING SELECT (OBS) VALUE
This message is used to set the OBS value used by the NAV 2000 as the elected radial for
computing the course deviation from a VOR. This message will have no effect unless the NAV
2000 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:
