V A L A V I O N I C S L T D
I N S 4 2 9 I N T E G R A T E D 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
Revision 3
Page 25 of 31
May 2013
SET STANDBY COMM FREQUENCY AND TRANSRECEIVER FUNCTION
This message is issued to set the standby COM frequency.
Message format:
“V” ..................... Message class. This is a VHF NAV message.
“29” .................... Message identifier.
Mk...................... Standby COM frequency:
m = desired frequency in MHz in hexadecimal, where m = desired frequency - 30h, with desired frequency
in range of 118 to 136 MHz, or 162 MHz.
k
= desired frequency in kHz, where k = (desired frequency / 25 kHz) + 30h, with desired frequency in
range of 000 to 975 kHz in 25 kHz steps.
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 COMM FREQUENCY AND TRANSCEIVER FUNCTION
This message is used to set the Active COMM frequency as well as he COMM 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.
