190-01182-02
GTR 225/GNC 255 TSO Installation Manual
Rev. F
Page B-11
B.2.4.1.9 Set Standby NAV Frequency
This message is used to set the standby NAV
Message format:
“V” ..........................Message class. This is a GNC 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 117MHz.
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.
“0”...........................Reserved, data in this field will be ignored.
Example message:
$PGRMV28?P0<chksm><CR><LF>
This example command would set the standby VOR frequency to 111.800MHz. This is interpreted by
noting that the ASCII “?” corresponds with 3Fh, +30h = 6Fh, converted to decimal equals 111 for the MHz
portion. The kHz portion converts ASCII “P” to 50h, -30h yields 20h, x 25 kHz steps = 800 kHz.
NOTE
The GNC will check input frequencies for validity. An RS-232 serial error message output
will be generated if the frequency is invalid.
Содержание GNC 255A
Страница 1: ...190 01182 02 March 2015 Revision F GTR 225 GNC 255 TSO Installation Manual ...
Страница 132: ......