Page 4-12 GNS 400W Series Installation ManualRev. G 190-00356-084.6 Serial Data4.6.1 Serial Data Function4.6.1.1 RS-232The 400W Series unit is capable of interfacing with other aviation instruments by transmitting RS-232Type 1 (often known as ARNAV format) and Type 2 (often known as Northstar format) data on the GPSRS-232 OUT 1 port. The data consists of the following (refer to Appendix D for a detailed data formatdescription):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 waypointCross track errorDesired trackDestination waypoint identifierBearing to destination waypointMagnetic variationNavigation and warning statusWaypoint sequence in routeWaypoint position (latitude and longitude) and magnetic variationNOTEAviation RS-232 data may be transmitted with or without the current GPS altitude infeet. Refer to Section 5.3.2.The 400W Series unit can receive pressure altitude, air data, and fuel data from certain systems on theGPS RS-232 IN 1 port.The 400W Series unit can communicate with a Ryan TCAD 9900B system using the GPS RS-232 OUT 2and GPS RS-232 IN 2 lines to display traffic information on the 400W Series unit.If two 400W or 500W Series units are installed in an aircraft, the GPS RS-232 OUT 3 and GPS RS-232IN 3 lines may be cross-connected to crossfill flight plans and user-defined waypoints from one 400W or500W Series unit to the other.NOTEThe 400W Series unit will crossfill with other GNS 400W/500W Series units or GTN6XX/7XX units only. It will not crossfill with the GNS 480 or older 400/500 Seriesunits.The 400W Series unit can communicate with an L3 Communications WX-500 Stormscope using the GPSRS-232 OUT 4 and GPS RS-232 IN 4 lines to display lightning strike information on the 400W Seriesunit.
