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#601549 - 06/12/16 12:09 AM com ports on laptop  
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sentrex1 Offline
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ottawa,canada
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]  
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DND ON Offline
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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]  
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Touch Tone Tommy Online content
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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]  
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Derrick Offline
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Derrick  Offline
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Yep, I started to say, always use the same usb port every time when using a serial/usb adapter.


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#601648 - 06/16/16 11:22 AM Re: com ports on laptop [Re: sentrex1]  
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jeffmoss26 Online content
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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
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