[Elecraft] KPA500/K3 AUX bus specification

[Wayne Burdick]

I designed the auxBus hardware interface and protocol. I’d be happy to answer any historical, philosophical, or metaphysical questions about it off-list. 

73,
Wayne
N6KR

---
http://www.elecraft.com

> On Apr 29, 2018, at 6:47 PM, ANDY DURBIN <a.durbin at msn.com> wrote:
> 
> "fraught with danger"?
> 
> 
> It's hard for me to imagine how monitoring an "output only" bus with a DSO could be "fraught with danger".   There would be nothing connected to the AUX bus except the DSO and a pull up resistor.   About the only way I can see to cause any damage is to exceed Io max of the 2N7002K.
> 
> 
> What risks have I overlooked?  I don't want to void the warranty while there are still unresolved issues with my KPA500.
> 
> 
> 73,
> 
> Andy k3wyc
> 
> 
> ________________________________
> From: Don Wilhelm <donwilh at embarqmail.com>
> Sent: Sunday, April 29, 2018 5:42 PM
> To: ANDY DURBIN; elecraft at mailman.qth.net
> Subject: Re: [Elecraft] KPA500/K3 AUX bus specification
> 
> Andy,
> 
> While you seem capable of reverse engineering the AUXBUS, it is fraught
> with danger if you get it wrong.
> You are "own your own" in this matter.
> 
> 73,
> Don W3FPR
> 
>> On 4/29/2018 7:37 PM, ANDY DURBIN wrote:
>> 
>> Don,
>> 
>> 
>> Thanks for the reply.
>> 
>> 
>> I'm familiar with the PC interface and have, in the hope of tracking
>> down a problem, built a logger that uses that bus to interrogate the
>> KPA500 at 10 Hz.  I was hoping the AUX bus would give a faster
>> detection of a spurious band change than my 10 Hz interrogation ^bn;.
>> I'll look at the bus with my DSO but I have already been given
>> information than suggests its data rate will be too low to be useful.
>> 
>> 
>> I may have to resort to instrumenting the shift register signals from
>> the front panel to the LPF but I was hoping to avoid that.
>> 
>> 
>> 73,
>> 
>> Andy
>> 
>> 
>> 
>> 
>> 
>> ------------------------------------------------------------------------
>> *From:* Don Wilhelm <donwilh at embarqmail.com>
>> *Sent:* Sunday, April 29, 2018 2:45 PM
>> *To:* ANDY DURBIN; elecraft at mailman.qth.net
>> *Subject:* Re: [Elecraft] KPA500/K3 AUX bus specification
>> The AUXBUS protocol is Elecraft proprietary and is not published.
>> It is the single wire communications between the K3 and its options,
>> both internal and external.
>> 
>> The K3 Programmers Reference and KPA500 Programmers Reference gives you
>> commands that can be issued from a PC or other connected computer -
>> those commands are quite extensive and can give you complete control
>> from a PC.
>> 
>> 73,
>> Don W3FPR
>> 
>> 
>>> From: elecraft-bounces at mailman.qth.net
>> [elecraft-bounces at mailman.qth.net] on behalf of ANDY DURBIN
>> [a.durbin at msn.com]
>>> Sent: Sunday, April 29, 2018 3:59 PM
>>> To: elecraft at mailman.qth.net
>>> Subject: [Elecraft] KPA500/K3 AUX bus specification
>>> 
>>> Can someone please point me to a definition or specification for the
>> KPA500 - K3 AUX Bus.   I have the KPA500 Programmer's Reference but
>> this appears to only cover the KPA500 - PC interface.
> 
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