Sadly, doing this test with a brand new USB-to-serial cable, it works 
fine.  However, that cable to the K3 yields nothing, and there are some 
funky voltages on U1 on the KIO3.  I'm afraid I may have blown the 
RS-232 transceivers on both the computer and K3 ends.  Time for a changeout.

73, Pete N4ZR

The World Contest Station Database, updated daily at www.conteststations.com
The Reverse Beacon Network at http://reversebeacon.net, blog at 
reversebeacon.blogspot.com


On 6/7/2010 9:34 AM, Bill VanAlstyne W5WVO wrote:
> Pete,
>
> If you are using HyperTerminal (or most other terminal emulation programs),
> you can turn "local echo" on or off. When doing the kind of testing you're
> doing, I turn it OFF to avoid confusion.
>
> (1) In the New Connection - HyperTerminal screen, select File>>  Properties.
>
> (2) In the New Connection Properties dialog box, click the Settings tab,
> then click the ASCII Setup... button.
>
> (3) In the ASCII Setup dialog box, make sure the "Echo typed characters
> locally" checkbox is UNCHECKED.
>
> (4) Click OK to commit the ASCII Setup settings.
>
> (4) Select the COM port you are going to test in the New Connection
> Properties dialog box and click OK to commit all settings for that port.
>
> Then the only thing that will appear on your screen as you type are the
> looped-back characters.
>
> Hope this helps --
> Bill W5WVO
>
> --------------------------------------------------
> From: "Pete Smith"<n...@contesting.com>
> Sent: Monday, June 07, 2010 4:17 AM
> To: "R. Kevin Stover"<rksto...@mchsi.com>
> Cc:<Elecraft@mailman.qth.net>
> Subject: Re: [Elecraft] How to test serial communications?
>
>    
>> Thanks, Kevin.  I assume (though the referenced test procedure doesn't
>> say it), that with pins 2 and 3 shorted to each other, each character
>> you type on hyperterminal should be echoed on-screen twice, once locally
>> and once by the loopback.  If that's the case. then it may be that I
>> just have a bad *computer* port, which would be good news indeed.
>>
>> 73, Pete N4ZR
>>
>> The World Contest Station Database, updated daily at
>> www.conteststations.com
>> The Reverse Beacon Network at http://reversebeacon.net, blog at
>> reversebeacon.blogspot.com
>>
>>
>> On 6/6/2010 4:51 PM, R. Kevin Stover wrote:
>>      
>>> I assume you're restarted both the computer and the K3.
>>> You need to eliminate either the computer or the K3 as the problem.
>>> Test the computer serial port by following these instructions.
>>>
>>> http://www.reliableracing.com/downloads/LoopBackTest.pdf
>>>
>>> If the port talks to itself the problem is with the K3.
>>>
>>> On 6/6/2010 2:13 PM, Pete Smith wrote:
>>>        
>>>> Today we had a heavy lightning storm pass through the area.  All of my
>>>> antennas were disconnected, as were all the control cables, but the
>>>> computer and my new K3 were still on.  When I returned to the shack
>>>> after the storm, everything appears to be working normally *except* that
>>>> none of my software can communicate with the K3.  The radio shows no
>>>> error messages, and transmits and receives normally - just no
>>>> communications.  Alas, I have no other serial devices in the shack, and
>>>> my backup computer does not have a serial port, so I can't test to
>>>> determine whether it is the port on the computer or the KIO3.
>>>>
>>>> Is there any diagnostic that can be performed in the K3 to determine if
>>>> in fact something's blown on the KIO3 board?
>>>>
>>>>          
>>>        
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