[Elecraft] com port PTT question

[DK5EW]

TNX all for advice. !
I tried via RS232/USB FTDI but that caused problems with WSJT. As I want 
to use also CAT I decided to go via 15pol ACC and PC's com 1.
Now I made that simple npn transistor solution and that works fine now.
73's Erwin/DK5EW
http://www.dk5ew.de

Am 20.09.2011 19:13, schrieb Cady, Fred:
> You can connect your PC's com port to the K3's com port and use either RTS or DTR to key the radio. Have a look at the PTT-KEY configuration menu item in your owner's manual. Section 3.3.2 in "The Elecraft K3: Design, Configuration, and Operation" describes how to do this in greater detail. An excerpt is:
>
> "There are at least four ways to key your K3 with a computer. The first is to use the RTS or DTR signals in the RS232 serial port connector. Your computer program must be able to send CW (and operate the push-to-talk, if needed) by activating the RTS and DTR lines. The K3 converts the RS232 signal levels (see Appendix B) to the required computer logic levels. The CONFIG:PTT-KEY menu allows you to choose which of the two RS232 signals is used for PTT and which is used for Keying. Table 3 12 shows the CONFIG:PTT-KEY menu to set up for computer keying and PTT. When using this method, make sure CONFIG:PTT-KEY and the computer program keying and PTT choices are the same."
>
>
>
> Fred Cady
> fcady at ke7x dot com
> "The Elecraft K3: Design, Configuration, and Operation"
> www.ke7x.com
>
>
>> -----Original Message-----
>> From: elecraft-bounces at mailman.qth.net [mailto:elecraft-
>> bounces at mailman.qth.net] On Behalf Of iain macdonnell - N6ML
>> Sent: Tuesday, September 20, 2011 9:58 AM
>> To: dk5ew at mmmonvhf.de
>> Cc: Elecraft at mailman.qth.net
>> Subject: Re: [Elecraft] com port PTT question
>>
>> Hi Erwin,
>>
>> You can't connect the COM port directly to the ACC port - you need a
>> transistor in the middle to convert the high/low voltages to a "pull
>> to ground". Interfaces like the ones described at:
>>
>> http://www.dxlabsuite.com/dxlabwiki/FSKConnection
>>
>> would work.
>>
>> 73,
>>
>>      ~iain / N6ML
>>
>>
>>
>> On Tue, Sep 20, 2011 at 3:42 PM, DK5EW<dk5ew at mmmonvhf.de>  wrote:
>>> Hello all,
>>> I have a small problem with PTT via com port and ACC plug.
>>> I made a 2 pin cable 9pol from PC to ACC 15pol to K3.
>>> I soldered pin 4 for PTT and pin 5 for ground.
>>> I tested it for correct wire and short - all O.K.
>>> Now as soon I connect the TRX-ACC and the com port (serial 9 pin) to
>> my
>>> PC the K3 goes on TX.
>>> Any solution out there ?
>>>
>>> --
>>> best regards
>>> Erwin/DK5EW
>>>
>>>
>>>
>>>
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