[Elecraft] K2 - computer interface

[Jack Brindle]

Just to make sure, did you use the special K2-computer cable in this setup? If not, then you probably need to replace some components in the KIO2 adapter board. The K2’s IO interface in NOT meant for RS-232 levels on all it’s lines. In fact only two of them can take the RS-232 levels. Make sure the K2 still operates properly at this point, the damage could have gone into the main microcontroller.

Jack Brindle, W6FB

> On Apr 29, 2015, at 8:45 AM, Poul Erik Karlshøj (PKA) <PKA at telepost.gl> wrote:
> 
> Don,
> I have done the test suggested in the KIO2 manual (hearing the sidetone - does that really check the SIO module?). The test went OK. And also I know that the K2 connected last time I tried on a computer with RS-232 port.
> I have tried to apply the 12V to the ATU either before or after applying 12V to the K2 (I seem to remember that there was an issue).
> 
> I checked that the K3 will connect at either speed 4800 or 38400 bps with this USB converter, so don't suspect it's a speed issue.
> 
> I have a KXUSB (which I assume is using the FTDI chipset), but I need info about how to connect the mini-jack (tip-ring-sleve) to a DB9 connector. Maybe you can help me?
> At least it's worth a try I think.
> 
> 73, Paul
> OZ4UN
> 
> -----Oprindelig meddelelse-----
> Fra: Don Wilhelm [mailto:w3fpr at embarqmail.com] 
> Sendt: 29. april 2015 16:54
> Til: Poul Erik Karlshøj (PKA); elecraft at mailman.qth.net
> Emne: Re: [Elecraft] K2 - computer interface
> 
> Paul,
> 
> Try another adapter, preferably one with the FTDI chipset.
> Many adapters do not like to run at the slower baud rate of the K2 (4800).  I suspect that may be problem with your K2.
> Try an application other than HRD.  HRD polls rapidly, so that may be part of the problem - although if you cannot even connect, I would believe the adapter is the problem unless something has happened to the
> K2 data port since the last time it was used.
> 
> Try the tests given in the KIO2 manual to determine if the K2 interface is working.  Even if you have the KPA100, try those tests - the TTL to
> RS-232 conversion in the KPA100 is the same as in the KIO2.
> 
> 73,
> Don W3FPR
> 
> On 4/29/2015 10:09 AM, Poul Erik Karlshøj (PKA) wrote:
>> I used to connect (using HRD) my K2 to a laptop having serial ports using the specially configured cable (K2 > ATU > computer). Worked just fine.
>> Quite a few years ago I got the K3 and connected the K3 (using HRD)  to a computer with no RS-232 ports using a Targus PA088E USB/RS-232 converter cable. Works fine and I kind of forgot about the K2.
>> 
>> Now, recently I decided to try to connect (using HRD) the K2 using this Targus USB converter and cannot get HRD to connect.
>> Should I be able to connect K2 to the computer (WIN7)? As stated it works just fine with the K3.
>> 
>> I think there should be a lot of (happy) K2 owners who can help me!
>> 
>> 
> 
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