[Elecraft] MicroHam microkeyer

[Chuck Mabbott]

Found page on the web
http://www.airborn.com.au/rs232.html

In the area of PC to CNC you never connected 1 to 1 at anytime.

Might be a little late, but some additional information can't hurt

73  Chuck AA8VS

----- Original Message ----- 
From: "Don Wilhelm" <w3fpr at earthlink.net>
To: "Chris Kantarjiev" <cak at dimebank.com>; <elecraft at mailman.qth.net>
Sent: Tuesday, October 25, 2005 12:38 PM
Subject: RE: Re: [Elecraft] MicroHam microkeyer


> Chris,
>
> Yes, that is true - the SHELL on the DE9 connector is commonly listed as
> protective (or frame) ground. Many interfaces do not implement or use the
> Carrier Detect signal, but one never knows for certain unless you have
> detailed info on the interface used.
>
> That is also why the special computer to K2 cable does not attach pin 1 at
> the computer end.  At the K2 end, pin 1 IS used as a ground to the K2
> chassis, and it is important for ground loops prevention and reducing the
> coupling of extraneous signals into the K2 that this shield be carried to
> the computer end (but not terminated there).
>
> The K2 9 pin connector, like many others, is NOT an RS232 serial port, and 
> I
> do not believe any claims otherwise have been made.  It is just a 
> connector
> that happens to have 2 RS232 signals (3 with signal ground) included in 
> its
> set of signals.  There is no standard for the connector itself, it is used
> in a variety of applications.  So unless a connector is designated as a
> serial port, make no assumptions that it really is - the K2 connector is
> labeled on th erear panel as AUX I/O, and that is truly what it is - a
> connector with auxiliary inputs and outputs, and must be interpreted in 
> the
> most generalized context of that labeling.
>
> 73,
> Don W3FPR
>
>> -----Original Message-----
>>
>> Hmm. Pin 1 on a DB25 for RS-232 is protective ground. On a DB9, it's
>> Data Carrier Detect...
>>
>> This URL doesn't point to the EIA standard, but is the most
>> practical explanation of serial connector wiring I've found:
>>
>> http://www.lammertbies.nl/comm/cable/RS-232.html
>>
>> 73 de chris K6DBG
>>
>
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