Original sentence: (military and civilian).For modes A and C, all aircraft receiving the interrogation signal will reply, whereas mode S allows aircraft to be addressed individually.In modern ATC systems the data appear with alphanumeric characters in a tag or label linked to the flight position symbol on the radar screen.Mode 1 — provides 2-digit 5-bit mission code (military only — cockpit selectable).Mode 2 — provides 4-digit octal unit code (military only — either set on the ground or changed in flight depending on the particular aircraft type).Mode 3/A — provides a 4-digit octal identification code for the aircraft, known as a squawk code, assigned by the air traffic controller (military and civilian).Mode 4 — provides a 3-pulse reply (dependent upon a valid 32-bit crypto coded challenge), military only.Mode 5 — provides crypto secure capability similar to Mode S including transmission of ADS-B and GPS position (military only).Mode C transmits pressure altitude, read automatically from the aircraft altimeter.Mode C — provides a 10-bit binary Gray code for the aircraft's pressure altitude (military and civilian).Mode S — originally envisioned as a data packet standard in both uplink data (1030 MHz) and downlink data (1090 MHz) formats, also used to provide a radar design wherein the transponder responds to selective interrogations (each aircraft can be assigned a fixed, unique ICAO 24-bit address for selective interrogation purposes).The A mode is based on a 4-digit code using numbers between 0 and 7 assigned by the ATC and set by the pilot enabling identification and monitoring.The downlink data format can also be utilized independently to squitter information such as position and velocity (AIS-P/TailLight).The mode S is triggered by a mode-S interrogation and can provide the particular information that is requested by the interrogation signal.There are several transponder modes, each offering different information:
Edited sentence: There are several transponder modes, each offering different information