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The green IDENT button is marked "ID". A transponder (short for trans mitter-res ponder [ 1 ] and sometimes abbreviated to XPDR, [ 2 ] XPNDR, [ 3 ] TPDR [ 4 ] or TP [ 5 ] ) is an electronic device that produces a response when it receives a radio-frequency interrogation.
The following list shows specific aeronautical transponder codes, and ranges of codes, that have been used for specific purposes in various countries. Traditionally, each country has allocated transponder codes by their own scheme with little commonality across borders. The list is retained for historic interest.
The user of the car may not even be aware that the transponder is there, because there are no buttons to press. When a key is inserted into the ignition lock cylinder and turned, the car's computer sends a signal to the transponder. Unless the transponder replies with a valid code, the computer will not allow the engine to be started.
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When the transponder receives an interrogation request, it broadcasts the configured transponder code (or "squawk code"). This is referred to as "Mode 3A" or more commonly, Mode A. A separate type of response called "Ident" can be initiated from the airplane by pressing a button on the transponder control panel.
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