Garmin GTX 32 Installation Manual

Garmin GTX 32 Installation Manual Manual pdf 33 page image

GTX 32 Installation Manual Page 4-5190-00303-60 Revision F4.4.1 RS-232 Serial Data Electrical CharacteristicsThe GTX 32 can be configured to include GPS, Altitude, and Airdata data inputs on two RS-232 inputlines. Altitude data supplied to the GTX 32 can be output to the GNS 480 (CNX80) on an RS-232 outputline.Refer to Figure C-3 (of this document) and the GDL 90 Installation Manual 560-1049-02 for informationwhen connecting to a GDL 90.Table 4-5. RS-232 Input/Output Pin AssignmentsPin Name Connector Pin I/ORS-232 OUT 1 P3271 20 OutRS-232 OUT 2 P3271 24 OutRS-232 IN 1 P3271 19 InRS-232 IN 2 P3271 2 InThe RS-232 outputs conform to EIA Standard RS-232C with an output voltage swing of at least ±5 Vwhen driving a standard RS-232 load. Refer to Appendix C for RS-232 serial data interconnect.4.5 RS-232 Input/Output, Software Update ConnectionsWhen the GTX 32 is installed in a system other than a Garmin Integrated Flight Deck system an optionalRS-232 serial data connector should be installed in the aircraft for future software upgrades, negating theneed to remove the transponder from the aircraft. The connector can be mounted anywhere convenientfor access, such as under the instrument panel, on a remote avionics shelf next to the unit or in theinstrument panel itself. Be sure to label the connector for Software Update. Do not include the TestMode Select switch in the aircraft. See Figure 4-2 for software update connections.If the GTX 32 installation interfaces with a GNS 480 (CNX80) in the aircraft, the GNS 480 (CNX80)must be turned off during GTX 32 software upload, due to loading of RS-232 port 1.Figure 4-2. GTX 32 Software Update Connections