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500 SERIES INSTALLATION MANUAL Page 4-11
P/N 190-00181-02 Rev G
4.6 SERIAL DATA
4.6.1 Serial Data Function
4.6.1.1 RS-232
The 500 Series unit is capable of interfacing with other aviation instruments by transmitting RS-232 Type
1 (often known as ARNAV format) and Type 2 (often known as Northstar format) data on the GPS RS-232
OUT 1 port. The data consists of the following (refer to Appendix C for a detailed data format
description):
Current latitude, longitude, and GPS altitude in feet (see Note below)
Current velocity vector (ground speed and direction of velocity vector over the ground)
Distance to waypoint
Cross track error
Desired track
Destination waypoint identifier
Bearing to destination waypoint
Magnetic variation
Navigation and warning status
Waypoint sequence in route
Waypoint position (latitude and longitude) and magnetic variation
NOTE
Aviation RS-232 data may be transmitted with or without the current GPS altitude in feet. Refer to section
5.2.2.
The 500 Series unit can receive pressure altitude, air data, and fuel data from certain systems on the GPS
RS-232 IN 1 port.
The 500 Series unit can communicate with a Ryan TCAD 9900B system using the GPS RS-232 OUT 2
and GPS RS-232 IN 2 lines to display traffic information on the 500 Series unit.
If two 400 or 500 Series units are installed in an aircraft, the GPS RS-232 OUT 3 and GPS RS-232 IN 3
lines may be cross-connected to crossfill flight plans and user-defined waypoints from one 400 or 500
Series unit to the other.
The 500 Series unit can communicate with a BF Goodrich WX-500 Stormscope using the GPS RS-232
OUT 4 and GPS RS-232 IN 4 lines to display lightning strike information on the 500 Series unit.
4.6.1.2 ARINC 429
The data output on the GPS ARINC 429 OUT port depends on the configuration (refer to section 5.2.1).
Below is a list of the configurations and the labels output for each one:
1. ARINC 429
2. GAMA 429
3. GAMA 429 Graphics
4. GAMA 429 Graphics w/Int
Label # Parameter Name 1234
001 Distance to Go (BCD) ••••
002 Time to Go (BCD) ••••
012 Ground Speed (BCD) ••••
074G Data Record Header • • •
075G Active Wpt From/To Data • • •
100 Selected Course 1 •
100G Selected Course 1 • • •
113G Message Checksum • • •
114 Desired Track (True) ••••