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#1
September 17th 06, 03:37 AM
posted to rec.aviation.owning
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Aircraft systems RS232 voltage levels?
While checking my new Garmin 496 power/data cable, I put a scope on the
NEMA DATAOut line. Just like the EI instruments, the Garmin puts out TTL (0V and 4V) logic levels instead of the normal RS232 voltage levels (-5V / -12V to +5V /+12V) Do all aircraft systems that communicate via "RS232" use the TTL levels? How about if I drag my Labtop out to the computer to read some diagnostics or upload a new database? 
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