My Serial Port COM9 has vanished

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kcranley
 
Posts: 19
Joined: Sat Jul 21, 2012 4:35 am

My Serial Port COM9 has vanished

Post by kcranley »

I have been successfully running my Arduino Uno R3 on my Win XP PC's COM9. However, although the Arduino is still powered, the Arduino software can no longer identify COM9. I have tried plugging in to different USB sockets, but this makes no difference. Can you please help?

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floresta
 
Posts: 223
Joined: Thu Jul 31, 2008 10:27 am

Re: My Serial Port COM9 has vanished

Post by floresta »

I have tried plugging in to different USB sockets, but this makes no difference. Can you please help?
The operating system typically assigns a different COM port number when you change USB sockets. Your best bet is to use 'Device Manager' to determine the appropriate COM port number.
- Connect your Arduino to a USB socket
- Click on 'Start'
- Right click on 'My Computer' and select 'Properties'
- Select 'Hardware' and then 'Device Manager'
- Expand Ports (COM & LPT) by clicking on the + sign
- Look for the USB Serial Port to determine the COM port assignment

Don

kcranley
 
Posts: 19
Joined: Sat Jul 21, 2012 4:35 am

Re: My Serial Port COM9 has vanished

Post by kcranley »

Thank you for your help. I discovered that the problem was due to the fact that I had not pushed the USB connector fully home. I was getting power, but not all connections had been made.

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