[Elecraft] K3S PTT using DTR/DTS issue

[ae4pb at carolinaheli.com]

Ok, the manual is wrong. I got it..ty ;)

-----Original Message-----
From: Elecraft [mailto:elecraft-bounces at mailman.qth.net] On Behalf Of Lyle
Johnson
Sent: Wednesday, September 23, 2015 10:48 AM
To: ae4pb at carolinaheli.com; elecraft at mailman.qth.net
Subject: Re: [Elecraft] K3S PTT using DTR/DTS issue

That won't work.  Nothing will be damaged.

The input signal group TO the radio from the outside world (RTS, DTR, serial
data) are physically switched as a group between the RS232 buffer chip and
the USB<-> serial chip.

In USB mode, data to the radio, along with RTS and DTR, will only be
recognized from the USB port.  Data FROM the radio will be available on both
the USB port and the RS232 port.  This allows you to use USB to a computer,
for example, while having an antenna tuner or SteppIR antenna or other
external devices "listen" to the radio data.

In the RS232 mode, all three signals are switched as a group to the
RS232 buffers.  Again, serial date FROM the radio is simultaneously present
on the USB and RS232 ports, though in this case the data on the USB port
will only be meaningful if the RS232 port is set to 38,400 bps because the
internal USB<->serial chip is set to communicate internally for 38,400 bps
at all times.

The USB mode or RS2323 mode are selected from the RS232 menu.  If a data
rate is displayed (4800, 9600, 19200 or 38400) then the RS232 mode is in
effect.  If the display is "USb" then the USB mode is selected.

Similarly, LINE OUT audio (from the radio) is always sent to both the USB
port AND the analog LINE OUT jack on the rear of the radio. if nothing is
plugged into the LINE IN jack, then audio in LINE mode will be taken from
the USB port.  If a plug is detected at the LIEN IN analog jack, then USB
audio will be ignored and audio will be expected from the analog LINE IN
jack.

I'm sorry if the documentation in the manual was not clear on these points.

73,

Lyle KK7P

> What I'm trying to do:
> 1. USB for audio and serial control.
> 2. RS232 for PTT keying.

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