Serial Interface Specifications; Altitude Encoder Format; Air Data Computer/Sensor Format - FreeFlight ADS-B FDL-978 Series Installation Manual

SECTION 6

SERIAL INTERFACE SPECIFICATIONS

Two data formats may be selected to accept input from external Altitude sensors:
•
Encoder Altitude – Gray-code to serial altitude converters, etc.
•
Air Data Computer – To select a data format, refer to Section 3.3.2.

6.1.1 Altitude Encoder Format

The Altitude Encoder (aka "Icarus") data format accepts messages with the following
parameters:
Compatible devices include Rosetta Encoders and Serializers (ARS 50 and ARS 100). The
compatible format for altitude information is the following 10 byte ASCII message:
Byte
Contents
Some examples include:

6.1.2 Air Data Computer/Sensor Format

The ADC format accepts messages with the following parameters:
Air Data messages are accepted when the serial port is set to "ENCODER." A packet consists
of a set of ASCII message strings. The first character of each packet is an ASCII Start-of-Text
(STX = 02H). The last character of each packet will be an ASCII End-of-Text (ETX = 03H). Each
message string begins with one ASCII character to identify it as an Air Data message ("Z"). The
second character identifies which message it is. The rest of the string consists of one or more
FFS Copyright © 2015 All rights reserved.
Baud: 9600
Parity: None
Start Bit: 1
Data Bits: 8
Stop Bit: 1
Update Rate: 1 msg/sec
0 1 2
A L T
'ALT 00000'
'ALT -1200'
'ALT 62505'
'ALT 05604'
Baud: 9600 (default minimum)
Parity: None
Start Bit: 1
Data Bits: 8
Stop Bit: 1
Update Rate: 1 msg/sec
ADS-B FDL-978 Series and
Lite Series Installation Manual
Document No. 87343 Rev F
3 4 5 6
1 2 3
0 feet
-1200 feet
62,505 feet
5,604 feet
7 8 9
4 5 c/r
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