[Elecraft] MicroHam microkeyer

[Chris Kantarjiev]

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

> > Might want to rethink just one pin of that. A connection from the
> > computer to pin 1 of the KIO2/KPA100's DE9 will probably create a
> > ground loop. Only connections to pins 2, 3 and 5 are needed.
> >
> > Pin 1 is the ground for the non-RS232 stuff (Auxbus, etc.).
> >
> > On Oct 24, 2005, at 4:38 AM, Don Wilhelm wrote:
> >
> > > If the Microkeyer has connections only to pins 1, 2, 3 and 5 of the
> > > 9 pin
> > > connector, one can safely plug it into the K2 directly.
> >
> > - Jack Brindle, W6FB