Yes, according to the Release notes (hfwnotes.rtf):
*MCU 5.33 / DSP 2.86 / FPF 1.23, 8-3-2015*
* PTT/KEY USE WITH THE USB PORT IMPROVED: PC applications can activate PTT
and KEY at the K3S via the USB port's RTS/DTR signals. However, initial
setup of the rig's USB port by the PC may cause pulsed or continuous
activation of the transmitter. This can happen if the computer is turned on
after the K3S, or if the USB cable is not connected. There is now a "Safe"
mode (the default) which disables PTT-KEY transmit until the K3S receives a
command via USB, such as a read of the rig's VFO frequency. To turn on safe
mode on/off, go into CONFIG:PTT-KEY and tap '1' to select "USB SAFE" or
"UNSAFE". Exit the menu and turn the K3S off/on. Applications that use
PTT-KEY via USB but never send commands may require "UNSAFE" mode. In this
case, unwanted transmit can be avoided by turning the PC on before the K3S.
* CANCELLING UNEXPECTED PTT-KEY ACTIVATION: If an external source (usually
a PC) activates PTT or KEY unexpectedly, you can cancel transmit by tapping
the XMIT switch. This will show ERR KEY or ERR PTT on VFO B. Once the PTT
or KEY source as been removed, transmit will be re-enabled. If the cause
may be unneeded PTT-KEY activation via the USB port, go into the
CONFIG:PTT-KEY menu entry and set the parameter to OFF-OFF.
However, if use an FTDI USB-to-Serial adapter on Windows with other
Elecraft radios or devices, the FTDI drivers provide an easy way to disable
the search for a serial mouse or legacy analog modem on the serial port,
and this prevents unwanted RTS/DTR "key down" activation at boot time.
This works with recent KUSB adapters or homebrew external CW or FSK keying
circuits on virtual serial ports that may be connected to your radio (K3,
K3S, KX2, KX3, etc.).
1. Open the Windows *Device Manager* (shortcut: Windows Key + R
(run): devmgmt.msc)
2. Expand *Ports*
3. *Right click* on the virtual COM port defined by the FTDI
USB-to-Serial Adapter
4. Click *Properties*
5. Select the *Port Settings* tab
6. Click the *Advanced...* button
7. Under *Miscellaneous Options*:
1. Uncheck *Serial Enumerator* (default is checked)
2. Check *Disable Modem Control at Startup* (default is unchecked).
This should be the only option in the list that should be checked.
8. Click *OK* to close the Advanced Settings dialog
9. Click *OK* again to close the Serial Port Properties dialog
As far as I know, only FTDI's USB-to-Serial drivers provide options to
disable this legacy behavior on Windows that causes RTS/DTR to be activated
at boot time.
73,
Bob, N6TV
On Thu, Mar 29, 2018 at 5:11 PM, Don Wilhelm <donw...@embarqmail.com> wrote:
> Bill,
>
> If you have updated the K3 firmware in the last few months, it does not
> make any difference whether the K3 or the computer is turned on first.
> The K3 now has a SAFE mode that disables DTR and RTS until it receives
> some command like polling for frequency, mode, etc. from your software
> application.
>
> You can go into the K3 CONFIG menu for KEY-PTT and turn it to unsafe if
> you have devices that monitor the RS-232 bus and do not issue any commands
> (SteppIR controllers for one instance).
>
> Look at the firmware release notes for the past 3 months.
> BTW, the firmware release notes should be considered an addition to your
> K3/K3S manual. Do not overlook them.
>
> 73,
> Don W3FPR
>
> On 3/29/2018 6:58 PM, Bill Frantz wrote:
>
>> On my Mac system, it doesn't seem to matter whether the radio or the
>> computer starts first. The USB interface to my upgraded K3 is powered from
>> the computer with enough functionality that the computer recognizes it
>> without the radio being on.
>>
>> In any case, start wsjt-x last because it will try to talk to the radio
>> for rig control and harass you until it can succeed. I've been in this
>> situation enough times to know that starting the radio, waiting until the
>> radio is ready to talk to the computer and then clicking "Retry" works.
>>
>> 73 Bill AE6JV
>>
>> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:Elecraft@mailman.qth.net
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
> Message delivered to n...@arrl.net
>
______________________________________________________________
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:Elecraft@mailman.qth.net
This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
Message delivered to arch...@mail-archive.com
