[Elecraft] K3 Firmware updating

[Joe Subich, W4TV]

 > Or do you mean the RS232 control lines? If so, and the device
 > gets powered down, doesn't it's hold on the control lines go
 > away???

No, with no power applied to RS-232 devices - whether it be a
computer serial port, MK2R+, MKII, or the K3 the "unpowered"
lines will load the other lines so they will not work properly.
Without special circuits, it is not possible to connect two
drivers to a single RS-232 port at the same time.

The best solution is the two port RS-232 switch.

Note, updating with K3 is a special case since the K3 does not
require the use of handshake signals for updating.  Other rigs
require handshake between their update software and the rig.
Since application controlled handshake is not supported AT ALL
by any microHAM interface, any upload capability is out of the
question for other rigs.

73,

    ... Joe Subich, W4TV
        microHAM America, LLC.
        http://www.microHAM-USA.com
        http://groups.yahoo.com/group/microHAM


On 6/16/2010 10:57 AM, Larry - K2GN wrote:
> Joe: Are you saying the there is a power requirement for the microHAM
> even when it is turned off???? Or do you mean the RS232 control
> lines? If so, and the device gets powered down, doesn't it's hold on
> the control lines go away??? de K2GN - Larry - http://k2gn.com K3 S/N
> - 3278    P3 S/N - ????  (Ordered)
>
>
>
>> Can I put a "Y" adaptor on the RS232 and run a USB to my laptop,
>> and leave the microHAM powered off?
>
>>> No.  The unpowered adapter (whether the microHAM device or the
>>> USB converter) will "pull down" the data lines resulting in no
>>> data between the K3 and the "powered" device.
>
>>> 73, ... Joe, W4TV
>
>
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