Garmin GTX 327 Installation Manual

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Page 20 GTX 327 Installation ManualRev J 190-00187-023.2.1 Function Selection SwitchesThe function selection switches are:• OFF  Powers off the GTX 327. Pressing the STBY, ON or ALT key powers on thetransponder displaying the last active identification code.• STBY  Selects the standby mode. When in standby mode the transponder will not reply toany interrogations.• ON  Selects Mode A. In this mode, the transponder replies to Mode A and Mode Cinterrogations, as indicated by the Reply Symbol (“®”), but the replies do notinclude altitude information.• ALT  Selects Mode A and Mode C. In ALT mode, the transponder replies toidentification and altitude as indicated by the Reply Symbol (“®”). Replies toaltitude interrogations include the standard pressure altitude (29.92 inches Hg.)received from an external altitude source, which is not adjusted for barometricpressure. The ALT mode may be selected in aircraft not equipped with an optionalaltitude encoder; however, the reply signal will not include altitude information.NOTEAny time the function switch is in the ON or ALT position the transponderbecomes an active part of the Air Traffic Control Radar Beacon System(ATCRBS). The transponder also responds to interrogations from TCASequipped aircraft.• IDENT  Pressing the IDENT key activates the Special Position Identification (SPI) Pulsefor 18 seconds, identifying the transponder return from others on an air trafficcontroller’s screen. During the IDENT period, the word ‘IDENT’ appears in theupper left corner of the display.• VFR  Sets the transponder code to the pre-programmed VFR code selected inConfiguration Mode (set to 1200 at the factory). Pressing the VFR key again willrestore the previous identification code.