In the KPA100 Manual there is a warning not to use standard RS-232 cables 
between the K2 SIO and a PC (only pins 2, 3 and 5 are normally connected)
Would it not be a similar problem using a serial to USB adapter?
Poul-Erik
OZ4UN 
-----Oprindelig meddelelse-----
Fra: elecraft-boun...@mailman.qth.net [mailto:elecraft-boun...@mailman.qth.net] 
På vegne af Chip Stratton
Sendt: 10. februar 2012 15:32
Til: KM4VX
Cc: elecraft@mailman.qth.net
Emne: Re: [Elecraft] K3 and K2 simultaneous on serial to USB cables tocomputer

Ron -

You might consider getting a 4 port USB to Serial adapter. I have my IC-7000, 
K2, and W1 wattmeter connected to one and all three are accessbile, each with 
its own com port assignment.

The one I purchased is based on the FTDI chipset, like the Elecraft KUSB 
adapter, and was abt $44 from Amazon. Search for:
4 Port RS232 FT4232HL Professional USB to Serial Adapter

Chip
AE5KA

On Fri, Feb 10, 2012 at 8:03 AM, KM4VX <ronce...@earthlink.net> wrote:
>
> I have both my K2 and K3 connected via  serial to USB cables, but I 
> cannot get the computer to recognize the K2.  The K3 is connected via 
> the Elecraft serial to USB cable and works fine. The K2 uses a serial 
> to USB adapter, but the computer refuses to recognize the K2 adapter 
> and insists on going to the K3. I imagine because both are called 
> "serial to USB adapters."  I know this is more of a computer question 
> than a K2/K3 issue and maybe the computer can't recognize two serial 
> to USB connections. Any recommendations for forcing the computer to 
> recognize the K2 or using a different adapter? The cable from IO2 on 
> the K2 is correct. The serial to USB adapter for the K2 may be 
> inferior. Even when I disconnect the K3 serial to USB cable, the computer 
> will still not recognize the K2 connection. Thanks.
>
> --
> View this message in context: 
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> to-USB-cables-to-computer-tp7272705p7272705.html
> Sent from the Elecraft mailing list archive at Nabble.com.
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