Garmin GTX327 Installation Manual

Also see for GTX 327: Pilot's guide Pilot's guide Installation manual Pilot's guide Pilot's guide

Page 4-6 GTX 327 Installation ManualRevision K 190-00187-024.3.1 RS-232 Serial Data Electrical CharacteristicsThe GTX 327 can be configured to include GPS, Altitude and Airdata data inputs on two RS-232 inputlines. Altitude data supplied to the GTX 327 can be output to the GPS on an RS-232 output line.Table 4-6. RS-232 Input/Output Pin AssignmentsPin Name Pin Number I/ORS-232 OUT 1 20 OutRS-232 IN 1 19 InRS-232 IN 2 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 Figures C-1 through C-3 for the RS-232 serial datainterconnect and to section 5.2.5 for RS-232 serial data configuration.4.4 RS-232 Input/Output, Software Update ConnectionsNOTEThe installation of an optional software upgrade connector is highlyrecommended. If the connector is wired in the aircraft, transponder removaland reinstallation for software upgrade is not required.When the GTX 327 is installed in an aircraft an optional RS-232 serial data connector should be installedfor future software upgrades, negating the need to remove the transponder from the aircraft. Theconnector can be mounted anywhere convenient for access, such as under the instrument panel, on aremote avionics shelf or in the instrument panel itself. Be sure to label the connector for SoftwareUpdate. Do not include the Test Mode Select switch in the aircraft. See Figure 4-3 for software updateconnections.If the GTX 327 installation interfaces with a GNS 480 (CNX80) in the aircraft, the GNS 480 (CNX80)must be turned off during GTX 327 software upload, due to loading of RS-232 port 1.Figure 4-3. GTX 327 Software Update Connections