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Aircraft systems RS232 voltage levels?



 
 
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Old September 17th 06, 02:37 AM posted to rec.aviation.owning
mikem
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Posts: 66
Default 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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