Thanks Don. I wasn't quite sure if the KUSB supplied was just a stock USB-RS232 
converter, or whether it may have been customised by Elecraft to leave the 
extra pins open circuit, so when I tested the interface I did use the "special" 
intervening cable.

Next step will be to set up the K2 with some logging/contest programs and find 
a nice CW contest to give the radio a bit of a workout :-)

73,
Matt VK2RQ

> On 9 Jun 2014, at 10:28 am, Don Wilhelm <[email protected]> wrote:
> 
> Do *NOT* plug the KUSB directly into the K2 AUX I/O connector.  You must use 
> the intervening 'special cable' that is detailed in the KIO2 instructions.  
> That cable can be short or long, but it must be installed to protect the K2 
> from damage.
> The AUX IO connector has internal K2 signals that are used for other Elecraft 
> accessories such as the KAT2 and XV series transverters.
> 
> The AUX IO is *not* an RS-232 port even though it contains 2 RS-232 signal 
> lines.
> 
> 73,
> Don W3FPR
> 
>> On 6/8/2014 7:21 PM, Matt VK2RQ wrote:
>> I just installed the KIO2 serial port in my K2. When I ordered the KIO2, I 
>> also ordered a KUSB USB-to-serial adapter cable. Is it safe to plug the KUSB 
>> cable directly into the KIO2 port, or do I need to connect it via the 
>> DB9-DB9 serial cable to ensure that only pins 2/3/5 are connected between 
>> the KIO2 and the KUSB?
>> 
>> 73,
>> Matt VK2RQ
> 
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