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Old 10-03-2010, 02:14 AM   #1
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Default DB9 question

Is it possible for the serial port on the MS to not work, and the MS to work perfectly fine??I have bought a new serial to usb connector, I think mine died, I'm fairly sure that the reason it doesn't work, just an idea... hence the question at hand..... Thoughts?? Idea's comments??
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Old 10-03-2010, 06:10 AM   #2
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Usually, the problem is not the serial port but the USB converter, but it is perfectly possible that U6 (MAX232) died. I've had a problem with failing serial and it turned out a bad ground trace to the chip, so measure all the traces out.
If you want to be sure, replace U6, they're cheap.
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Old 10-03-2010, 10:32 AM   #3
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Originally Posted by p51hellfire View Post
Is it possible for the serial port on the MS to not work, and the MS to work perfectly fine??
Yes. The RS-232 driver chip (U6 / MAX232) is separate from the CPU and not required for normal operation of the ECU. You could remove it from the board and the engine would run fine. I can't imagine how you'd cause one to fail, just giving you a direct answer.
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