Installation manual

Serial Interface Specifications
Apollo SL30 Installation Manual
57
MESSAGE DEFINITIONS
INPUT MESSAGES
Remote COMM Frequency Lists
The following two commands work together in allowing remotely connected devices to provide
COMM frequency lists associated with an airport to the SL30. The host device should first send
the Remote Airport Identifier Name command (message identifier 04), followed by a sequence of
Remote Frequency Input commands (message identifier 05). The list type field is used to tie the
two commands together. The SL30 will receive up to 10 Comm frequency lists, each containing
up to twenty entries.
Remote Airport Identifier Name
This input command provides the airport identifier name that is used to identify to the user which
airport facility that the list of frequencies is associated with.
Message format:
“C” ................ Message Class. This is a COMM message.
“04”............... Message Identifier.
t..................... List type: (ASCII) “0”, “1”,…,”9”
aaaa ............... Airport Identifier of the frequency list. Note that if the airport identifier is 3
characters, then the 4th character will be filled with a space. Airport
Identifiers are restricted to using ASCII characters 0-9 and A-Z.
Example message:
$PMRRC041SLE<SP><chksum><CR><LF>
Airport Identifier to be associated with list #1, Airport Identifier to display is “SLE “.
Remote Airport Frequency Input
This message is used to input COMM frequency data used for the remote recall function.
The data included is a character defining the list type, a character defining the frequency type
(tower, ground, ATIS, ...) and 2 characters defining the frequency. The SL30 module will accept
the first 10 frequencies received through the serial port for each airport.
Message format:
“C” ................ Message Class. This is a COMM message.
“05”............... Message Identifier.
t..................... List type: (ASCII) “0”, “1”,…, “9”
f..................... Frequency type: 0-Fh; use encoded hex
2
(30h-3Fh).
0 = Tower Frequency (TWR)
1 = Ground (GND)
2 = Automatic Terminal Information Service or ATIS (ATS)
2
Encoded hex: each character consists of a 4-bit data placed in the low order nibble +30h. For example, the 8-bit
value 5Fh would be encoded as two characters with values of 35h and 3Fh, which map to the ASCII characters “5”
and “?”, respectively.