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Topic: Identifying the respective pin numbers of a USB to DB9 male adapter (Read 1 time) previous topic - next topic


Hi, I am a COMPLETE novice at this and I want to find out which part of the DB9 male goes to pin 1, 2, 3 etc. and which one is gnd and such. How do I start out? Thanks!


How do I start out?

0.26 seconds with google. "DB9 pinout".


Or google DE-9 and look at images:





well..that was embarassing. thanks people!

wait a minute, I just found out that the DB9 adapter's configuration was jumbled up. The challenge is for us to find out config via serial monitor. Help please? thanks! :) sorry im really a novice hehe


Typically, pins 2 & 3 are the Rx & Tx pins and 5 is Gnd.
If you look into end of the connector you can usually see pin numbers. 1-2-3-4-5 are all along the "top row" which is the wider part of the connector.
If things aren't talking, switch the wires between 2 & 3.
Designing & building electrical circuits for over 25 years.  Screw Shield for Mega/Due/Uno,  Bobuino with ATMega1284P, & other '328P & '1284P creations & offerings at  my website.

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