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#601549 - 06/12/16 12:09 AM com ports on laptop  
Joined: Jul 2005
Posts: 1,645
sentrex1 Offline
sentrex1  Offline


Joined: Jul 2005
Posts: 1,645
this might be a stupid question for you brainiacs here but here goes.
i use a usb to serial adaptor to connect to Cisco routers using Putty.
I was alway using the same usb port on my laptop (com4) but suddenly the other day the same usb port became com 3,why would it suddenly change?
isn't like usb1 =com1 and so on?

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#601550 - 06/12/16 01:54 AM Re: com ports on laptop [Re: sentrex1]  
Joined: May 2009
Posts: 1,186
DND ON Offline
DND ON  Offline

Joined: May 2009
Posts: 1,186
Did the driver get updated? That might do it.

There is no relationship between COM ports and USB ports. I have two radio programming cables that use the same USB port. One is assigned as COM 3, the other is COM 4.

#601565 - 06/13/16 05:30 PM Re: com ports on laptop [Re: sentrex1]  
Joined: Jul 2001
Posts: 3,206
Touch Tone Tommy Offline
Moderator-Avaya-Lucent, Antique Tele
Touch Tone Tommy  Offline
Moderator-Avaya-Lucent, Antique Tele

Joined: Jul 2001
Posts: 3,206
Paso Robles, CA
Yeah, but when you move one of those USB/serial cables to a different usb port, it will become a different com port. You've just associated com-X with USB/Serial cable X and Com-Z with USB/Serial cable Z, while using one particular USB port.

#601593 - 06/14/16 10:59 PM Re: com ports on laptop [Re: sentrex1]  
Joined: Jan 2008
Posts: 3,675
Derrick Offline
Retired Moderator
Derrick  Offline
Retired Moderator

Joined: Jan 2008
Posts: 3,675
Crestview Fla
Yep, I started to say, always use the same usb port every time when using a serial/usb adapter.

"Old phone guys never die, they just get locked in some closet with an old phone system and forgotten about"

Retired, taking photographs and hoping to fly one of my many kites.
#601648 - 06/16/16 11:22 AM Re: com ports on laptop [Re: sentrex1]  
Joined: Dec 2002
Posts: 8,007
jeffmoss26 Online content
jeffmoss26  Online Content


Joined: Dec 2002
Posts: 8,007
Beachwood, OH
We've run into this issue with our computers that connect to alarm panels for programming. I mark the port on the PC and tell the user not to move the cable - if they need to switch it, they unplug the 25 pin connector from the respective modem.

Jeff Moss

Moss Communications
Computer Repair-Networking-Cabling

Moderated by  tito1411 

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