Hi Floyd,
I've owned and operated a pair of K2s, both of which I bought used.
Elecraft makes it very clear that the DB9 connector on the K2 is NOT an
RS232 interface, that it is not RS232 compliant, and that a standard
RS232 cable should NOT be used. Rather, the DB9 connector provides both
serial control AND several control functions.
The DB9 connector is a generic part, and can be used for many things
besides RS232. It is also well known that while the RS232 Standard
defines voltage levels, MANY modern products produce far less than those
levels.
I've owned a lot of gear in my lifetime, and the first thing I do is
open the manual, study it, study the wiring of the various connectors,
study the specs, and study the operating instructions.
73, Jim K9YC
On Sat,8/22/2015 1:28 PM, Floyd Sense wrote:
Hi Don. I'm sure you're aware that the RS232 spec includes the
description of voltage levels, and if you're going to refer to an
interface as RS232 (as Elecraft does in many places) then you're
implying that the normal RS232 signal levels will be used. A user
shouldn't be required to read a one hundred page manual before
plugging in a connector when every other such connector works in the
conventional way. Having been a designer using RS232 interfaces 45
years ago, I would have been executed had I designed something like this.
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