Garmin NavComm SL30, Руководство по установке, Страница: 75 / 88

Serial Interface Specifications
Apollo SL30 Installation Manual
67
S
ET
A
CTIVE
VOR/LOC F
REQUENCY AND
R
ECEIVER
F
UNCTION
This message is used to set the active VOR or Localizer frequency as well as the receiver
operating function. The SL30 can detect if the supplied frequency corresponds to a VOR or a
Localizer channel, so this command will work for both types of NAV aids.
Message format:
“V” ................ Message class. This is a VHF NAV message.
“27” ............... Message identifier.
mk.................. Active VOR/LOC frequency:
m = desired frequency in MHz in hexadecimal, where m = desired
frequency - 30h, with desired frequency in 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 950 kHz in 50 kHz steps, or
the even numbers from 30h to 56h.
a..................... Receiver function: N = normal; M = monitor; 0 = unchanged.
Example message:
$PMRRV27E4N<chksm><CR><LF>
This example command would set the active VOR frequency to 117.100 MHz. This can be
interpreted by noting that the ASCII ‘E’ corresponds with 45h, +30h = 75h, converted to decimal
equals 117 for the MHz portion of the command. The kHz portion converts ASCII ‘4’ to 34h, -
30h = 4h, x25 kHz steps = 100 kHz. This command would also set the receiver function to
normal, leaving the standby channel inactive.
Note: The SL30 will check input frequencies for validity. An RS-232 serial error message
output will be generated if the frequency is invalid.
S
ET
S
TANDBY
VOR/LOC F
REQUENCY AND
R
ECEIVER
F
UNCTION
This message is used to set the standby VOR or Localizer frequency as well as the receiver
operating function. The SL30 can detect if the supplied frequency corresponds to a VOR or a
Localizer channel, so this command will work for both types of NAV aids.
Message format:
“V” ................ Message class. This is a VHF NAV message.
“28” ............... Message identifier.
mk.................. Standby VOR/LOC frequency:
m = desired frequency in MHz in hexadecimal, where m = desired
frequency - 30h, with desired frequency in 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, or
the even numbers from 30h to 56h.
a..................... Receiver function: N = normal; M = monitor; 0 = unchanged.