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Serial Interface Specifications
68 Apollo SL30 Installation Manual
Example message:
$PMRRV28?PM<chksm><CR><LF>
This example command would set the standby VOR frequency to 111.800 MHz. This is
interpreted by noting that the ASCII ‘?’ corresponds with 3Fh, +30h = 7Bh, converted to decimal
equals 111 for the MHz portion. The kHz portion converts ASCII ‘P’ to 50h, -30h yields 20h,
x25 kHz steps = 800 kHz. This command would also set the receiver function to monitor, so the
receiver would time-multiplex the active and standby VOR channels to track both stations.
Note: The SL30 will check input frequencies for validity. An RS-232 serial error message output
will be generated if the frequency is invalid.
SET STANDBY COMM FREQUENCY AND TRANSCEIVER FUNCTION
This message is used to set the standby COMM frequency.
Message format:
“V”.................Message class. This is a VHF NAV message.
“29”................Message identifier.
mk ..................Standby COMM 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, M = monitor, 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 portion. The kHz portion converts ASCII ‘4’ to 34h, -30h yields
4h, x25 kHz steps = 100 kHz.
Note: The SL30 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 the COMM transceiver
function.
This message is only available in normal mode.
Message format:
“V”.................Message class. This is a VHF NAV message.