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Use of DB9 Switch with K3?

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Georgek5kg

Use of DB9 Switch with K3?

At times, my microHam CW Keyer is connected to my K3 via the P3. However,
when I want to download new firmware for the K3, I have to disconnect the
CW Keyer from the RS232 port, and connect the DB9 from the computer's serial
port to the K3 via the P3.

Can I use a DB9 A/B switch to switch between the the two DB9 cables without
creating any problems?

73, George

George Wagner, K5KG
Sarasota, FL
941-400-1960 cell
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Dick Dievendorff

Re: Use of DB9 Switch with K3?

I use two, in series.

Dick, K6KR

Dick

On Dec 17, 2010, at 19:45, [hidden email] wrote:

> At times, my microHam CW Keyer is connected to my K3 via the P3. However,
> when I want to download new firmware for the K3, I have to disconnect the
> CW Keyer from the RS232 port, and connect the DB9 from the computer's serial
> port to the K3 via the P3.
>
> Can I use a DB9 A/B switch to switch between the the two DB9 cables without
> creating any problems?
>
> 73, George
>
> George Wagner, K5KG
> Sarasota, FL
> 941-400-1960 cell
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html

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Joe Subich, W4TV-4

Re: Use of DB9 Switch with K3?

In reply to this post by Georgek5kg

I unplug the microHAM RS-232 cable and connect a standard
cable from COM1 (the serial port on the motherboard) of
my test system when I need to upload firmware. However,
I know of several others who are using a serial A/B switch
without problems.

For safety reasons make sure the switch is a break before
make (non-shorting) type.

73,

... Joe, W4TV

On 12/17/2010 10:45 PM, [hidden email] wrote:

Dick Dievendorff

Re: Use of DB9 Switch with K3?

In reply to this post by Georgek5kg

Hi, George.

I use three DB9 ABCD switches in my SO2R station. Let's call them "Left",
"Right" and "Development computer". I write software for the K3 and I very
frequently need to send firmware from my development computer to one of my
two K3s.

Each of two K3s is connected to the "common" center connector of the
corresponding "Left" and "Right" DB9 ABCD switches. The "A" input of the
Left and Right DB9 ABCD switches is connected to MK2R+ cables. The "B"
input of the left and right DB9 ABCD switches goes to "A" and "B" of the
"Development computer" switch. The center of the "Development computer"
switch goes thru a KUSB USB to Serial adapter to my development computer.

To operate with the MK2R+, I switch both Left and Right DB9 switches to "A".

To load firmware, I switch both Left and Right DB9 switches to "B". I
switch the "Development computer" DB9 switch to A to load the left K3 with
firmware, and "B" to load the right K3 with firmware.

I've had no difficulties with two of these boxes in series. I use a one
meter DB9 "straight through" jumper from Left and Right DB9 switches to the
back panel of my K3s. I use another one meter jumper from the Left and
Right DB9 switches to the "Development Computer" DB9 switch. I use a two
meter or sometimes two two-meter jumpers from the development computer to
the "Development computer" DB9 switch.

Whew!

A picture would be easier, I think.

73 de Dick, K6KR

-----Original Message-----
From: [hidden email]
[mailto:[hidden email]] On Behalf Of [hidden email]
Sent: Friday, December 17, 2010 7:45 PM
To: [hidden email]; [hidden email]
Subject: [Elecraft] Use of DB9 Switch with K3?

At times, my microHam CW Keyer is connected to my K3 via the P3. However,
when I want to download new firmware for the K3, I have to disconnect the
CW Keyer from the RS232 port, and connect the DB9 from the computer's serial

port to the K3 via the P3.

Can I use a DB9 A/B switch to switch between the the two DB9 cables without
creating any problems?

73, George

George Wagner, K5KG
Sarasota, FL
941-400-1960 cell
______________________________________________________________
Elecraft mailing list
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Help: http://mailman.qth.net/mmfaq.htm
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______________________________________________________________
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Post: mailto:[hidden email]

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