Garmin GNS 480 Installation Manaul

Also see for Apollo CNX80: User Newsletter User Newsletter Supplemental Flight manual Pilot's guide Data list

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Appendix B - Serial Interface SpecificationsGNS 480 (CNX80) Installation Manual 560-0982-01 Rev LB.2.1.4.4Remote Localizer ListThe following two commands work together in allowing the GNS 480 to provide a list of localizerfrequencies associated with an airport to a remote device (such as the SL30). The GNS 480 will first sendthe Remote Localizer List Header command (message identifier 22), followed by a sequence of RemoteLocalizer Input commands (message identifier 23). The remote device should maintain a single remotelocalizer list, so each new list received will replace any previous list. Subsequent receptions of localizerlists for the same airport may be ignored. There may be up to twenty entries in the remote Localizer list.B.2.1.4.4.1 Remote Localizer List HeaderThis output command marks the beginning of a Localizer list sent by the GNS 480. It specifies the fivecharacter airport identifier associated with the localizer frequencies in the list.Message format:“V” ............Message Class. This is a VHF NAV message.“22” ...........Message Identifier.aaaa............Airport identifier. Note that if the airport identifier is less than four characters, then thetrailing characters will be filled with spaces. Airport Identifiers are restricted to usingASCII characters 0-9 and A-Z.Example message:$PMRRV22SLEIndicates the start of a remote localizer list associated with the airport “SLE ”.B.2.1.4.5Remote Localizer InputThis output is used to provide Localizer frequency data that is used for the remote recall function.The data consists of three characters to identify the runway associated with the localizer, followed by twocharacters defining the frequency.Message format:“V” ............Message Class. This is a VHF NAV message.“23” ...........Message Identifier.iiii ..............Station or Runway identifier. This field will provide an identifier for the localizer whichcan be either the actual station identifier or a string indicating the runway associated withthe localizer. The station identifier can be up to four characters long. A runway identifierwill typically be two numbers that indicate the runway direction followed by the character“R”, “C”, or “L” to differentiate between parallel runways (right, center, and left). Notethat if either type of identifier is less then four characters, then the trailing characters willbe filled in with spaces. Identifiers are restricted to using ASCII characters 0-9 and A-Z.mk..............Frequency: m = MHz, where m = MHz frequency – 30h, with the desired frequencyranging from 108 to 111 MHz, or 3Ch to 3Fh; k = (desired kHz offset / 25 kHz) + 30h,where the desired frequency ranges from 000 to 950 kHz, or the even numbers from 30hto 56h. Note that the field will be checked to ensure that it is in range and a valid localizerfrequency. Frequencies used for VORs, which can also be found in the range of 108.10 to111.95 MHz, will not be accepted in this message type.