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sharing K3 RS232 to CAT and Remoterig

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Jorge Diez - CX6VM-2

sharing K3 RS232 to CAT and Remoterig

Hello

At my station, I have Elecraft K3, Bandmaster III, SixPack, CAT cable
connected to K3´s RS232

So when I change bands in the radio, antenna is selected automatically
through CAT cable and band decoder (Bandmaster III)

Today I connected remoterig box, so needed to remove CAT cable to connect
remoterig.

So now I lost the feature to change antennas automatically when I change
bands on the K3

How can I do to share RS232 to have CAT and remoterig at the same time?

thanks,
Jorge
CX6VM/CW5W
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k6dgw

Re: sharing K3 RS232 to CAT and Remoterig

Jorge,

Basically, you cannot share an serial RS-232 connection between devices,
with one exception: It is possible to have a receive-only device monitor
[eavesdrop or "listen in" on] the TXD or RXD signals. It can't transmit
though.

"So now I lost the feature to change antennas automatically when I
change bands on the K3"

Do you mean that you changed your connection back from the remoterig to
your local equipment and that no longer works?

I use an A/B data switch to switch my K3 CAT port between the local
computer when I'm operating with my home antenna, and the remoterig for
when I'm operating W7RN remotely.

73,

Fred ["Skip"] K6DGW
Sparks NV DM09dn
Washoe County

On 11/14/2017 12:23 PM, Jorge Diez - CX6VM wrote:

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Jorge Diez - CX6VM-2

Re: sharing K3 RS232 to CAT and Remoterig

Hello Fred

I lost automatically antenna change because I needed to remove my CAT cable
from K3 to connect remoterig. Of course if I removed remoterig RS232 cable
and connect CAT cable all is OK as I had it before connecting remoterig

That switch A/B is not an option for what I am looking for, I need both at
the same time

thanks!
Jorge

2017-11-14 18:12 GMT-03:00 Fred Jensen <[hidden email]>:

> Jorge,
>
> Basically, you cannot share an serial RS-232 connection between devices,
> with one exception: It is possible to have a receive-only device monitor
> [eavesdrop or "listen in" on] the TXD or RXD signals. It can't transmit
> though.
>
> "So now I lost the feature to change antennas automatically when I change
> bands on the K3"
>
> Do you mean that you changed your connection back from the remoterig to
> your local equipment and that no longer works?
>
> I use an A/B data switch to switch my K3 CAT port between the local
> computer when I'm operating with my home antenna, and the remoterig for
> when I'm operating W7RN remotely.
>
> 73,
>
> Fred ["Skip"] K6DGW
> Sparks NV DM09dn
> Washoe County
>
>
> On 11/14/2017 12:23 PM, Jorge Diez - CX6VM wrote:
>
>> Hello
>>
>> At my station, I have Elecraft K3, Bandmaster III, SixPack, CAT cable
>> connected to K3´s RS232
>>
>> So when I change bands in the radio, antenna is selected automatically
>> through CAT cable and band decoder (Bandmaster III)
>>
>> Today I connected remoterig box, so needed to remove CAT cable to connect
>> remoterig.
>>
>> So now I lost the feature to change antennas automatically when I change
>> bands on the K3
>>
>> How can I do to share RS232 to have CAT and remoterig at the same time?
>>
>> thanks,
>> Jorge
>> CX6VM/CW5W
>> ______________________________________________________________
>>
>>
> ______________________________________________________________
> Elecraft mailing list
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--
73,
Jorge
CX6VM/CW5W
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k6dgw

Re: sharing K3 RS232 to CAT and Remoterig

OK, I understand. The Bandmaster III obtains band information from your
K3 by sending commands that request it and decoding the replies from the
K3. That is, it's a 2-way communications. When the Remoterig box is
connected, it also sends commands and receives replies from the K3 ...
also 2-way.

I believe there may be a solution however. The Elecraft KRC2 band
decoder obtains band data from the K3 using the ACC port leaving the
RS-232 CAT port free for the Remoterig. The KRC2 would essentially
replace your Bandmaster. [:-(

This solution assumes that the KRC2 continues to produce band
information for antenna switching when the K3 is connected to the
Remoterig and in TERMinal mode. I don't know the answer to that
question, perhaps someone on the list does.

73,

Fred ["Skip"] K6DGW
Sparks NV DM09dn
Washoe County

On 11/14/2017 1:26 PM, Jorge Diez - CX6VM wrote:

> Hello Fred
>
> I lost automatically antenna change because I needed to remove my CAT
> cable from K3 to connect remoterig. Of course if I removed remoterig
> RS232 cable and connect CAT cable all is OK as I had it before
> connecting remoterig
>
> That switch A/B is not an option for what I am looking for, I need
> both at the same time
>
> thanks!
> Jorge
>

Don Wilhelm

Re: sharing K3 RS232 to CAT and Remoterig

In reply to this post by Jorge Diez - CX6VM-2

Jorge,

You cannot have RemoteRig and the K3 on the same COM port. You must use
2 different COM ports. Otherwise, the K3 drivers and the RemoteRig
drivers on the RS-232 connection will interfere with each other.

If you do a study of RS-232 mark and space voltages, you will find that
it is a point to point (one to one) communication. Other devices may
"listen in" to the communications, but they must have all drivers
disabled and set to a high impedance state. The K3 and the RemoteRig do
not meet that criteria, so they cannot co-exist on the same COM port
connection.

The only solution is to use 2 COM ports (one for K3 and one for
RemoteRig), and if they must synchronize, that will need to be done in
the computer - but I don't know of any software application that will do
that synchronization.

73,
Don W3FPR

On 11/14/2017 4:26 PM, Jorge Diez - CX6VM wrote:
> Hello Fred
>
> I lost automatically antenna change because I needed to remove my CAT cable
> from K3 to connect remoterig. Of course if I removed remoterig RS232 cable
> and connect CAT cable all is OK as I had it before connecting remoterig
>
> That switch A/B is not an option for what I am looking for, I need both at
> the same time
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john@kk9a.com

Re: sharing K3 RS232 to CAT and Remoterig

In reply to this post by Jorge Diez - CX6VM-2

I use a Top Ten Band decoder to control a SixPak. This is connected to the
RS-232 jack. I often have other devices(such as a MicroHAM DigiKeyer2) also
connected to this jack using a N6TV Y-box. For two devices you can use an
inexpensive Y adaptor instead. I have no experience with a remoterig box.

John KK9A

Jorge Diez - CX6VM cx6vm.jorge at gmail.com
Hello

At my station, I have Elecraft K3, Bandmaster III, SixPack, CAT cable
connected to K3´s RS232

So when I change bands in the radio, antenna is selected automatically
through CAT cable and band decoder (Bandmaster III)

Today I connected remoterig box, so needed to remove CAT cable to connect
remoterig.

So now I lost the feature to change antennas automatically when I change
bands on the K3

How can I do to share RS232 to have CAT and remoterig at the same time?

thanks,
Jorge
CX6VM/CW5W

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Jorge Diez - CX6VM-2

Re: sharing K3 RS232 to CAT and Remoterig

Hi John

thanks for the information

N6TV Y box will work for ACC port, but I need something equal for RS232 port

I use a Y cable to ACC to drive bandecoder and amplifier and works fine

thanks,
Jorge

2017-11-14 20:34 GMT-03:00 <[hidden email]>:

> I use a Top Ten Band decoder to control a SixPak. This is connected to the
> RS-232 jack. I often have other devices(such as a MicroHAM DigiKeyer2) also
> connected to this jack using a N6TV Y-box. For two devices you can use an
> inexpensive Y adaptor instead. I have no experience with a remoterig box.
>
> John KK9A
>
>
> Jorge Diez - CX6VM cx6vm.jorge at gmail.com
> Hello
>
> At my station, I have Elecraft K3, Bandmaster III, SixPack, CAT cable
> connected to K3´s RS232
>
> So when I change bands in the radio, antenna is selected automatically
> through CAT cable and band decoder (Bandmaster III)
>
> Today I connected remoterig box, so needed to remove CAT cable to connect
> remoterig.
>
> So now I lost the feature to change antennas automatically when I change
> bands on the K3
>
> How can I do to share RS232 to have CAT and remoterig at the same time?
>
> thanks,
> Jorge
> CX6VM/CW5W
>
>

john@kk9a.com

Re: sharing K3 RS232 to CAT and Remoterig

You are correct, my mistake. However the antenna selection should follow your radio regardless if you are using remoterig or not.

John KK9A

From: Jorge Diez - CX6VM [mailto:[hidden email]]
Sent: Tuesday, November 14, 2017 6:59 PM
To: [hidden email]
Cc: Elecraft Reflector
Subject: Re: [Elecraft] sharing K3 RS232 to CAT and Remoterig

Hi John

thanks for the information

N6TV Y box will work for ACC port, but I need something equal for RS232 port

I use a Y cable to ACC to drive bandecoder and amplifier and works fine

thanks,

Jorge

2017-11-14 20:34 GMT-03:00 <[hidden email]>:

I use a Top Ten Band decoder to control a SixPak. This is connected to the
RS-232 jack. I often have other devices(such as a MicroHAM DigiKeyer2) also
connected to this jack using a N6TV Y-box. For two devices you can use an
inexpensive Y adaptor instead. I have no experience with a remoterig box.

John KK9A

Jorge Diez - CX6VM cx6vm.jorge at gmail.com

Hello

At my station, I have Elecraft K3, Bandmaster III, SixPack, CAT cable
connected to K3´s RS232

So when I change bands in the radio, antenna is selected automatically
through CAT cable and band decoder (Bandmaster III)

Today I connected remoterig box, so needed to remove CAT cable to connect
remoterig.

So now I lost the feature to change antennas automatically when I change
bands on the K3

How can I do to share RS232 to have CAT and remoterig at the same time?

thanks,
Jorge
CX6VM/CW5W

--

73,
Jorge
CX6VM/CW5W

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ng7m

Re: sharing K3 RS232 to CAT and Remoterig

In reply to this post by Jorge Diez - CX6VM-2

If you want to share the K3 CAT RS232 port and feed with other hardware,
the best way I have found is using Win4K3Suite. Not only will Win4K3Suite
let you share the CAT feed of your K3 with multiple software applications
at the same time, but you can do it with physical serial connections too.
Win4K3Suite connects to your K3's direct CAT/RS232 port and then manages
the feed to other physical ports and or virtual RS232 port pairs for
software connections.

For example, I can have N1MM+, DXLab Commander and WSJT-X all sharing the
CAT feed, each program follows the other if you want them all running at
the same time... and beyond that I can setup another connection to my 2K-FA
amp. In this example, all three software applications think they are
directly connected to the K3. They all can poll the K3 data and they all
receive the output data.

The latest version of Win4K3Suite lets you setup up to 6 Aux/CAT ports for
this purpose. They can be virtual com port pairs for software or direct
connections to physical serial ports for an amplifier, SDA100, auto antenna
tuner etc... It works very well and is rock solid reliable in my
experience.

I have a YouTube video that shows this... around minute 18 of the top of my
head. In the quick demo in that part of the video I should the 2K-FA
following the K3 along with a couple software apps, N1MM+ and DXLab
Commander, if memory serves me correct. Jump to minute 18 a watch for a
few minutes: https://www.youtube.com/watch?v=Ku8Gyl0amRY

I'm assuming this is what you are looking for with your remote rig
connection to your K3. You want the remote rig box to think it's directly
connected to the K3 at the same time other software and hardware think they
are directly connected.

Win4K3Suite provides the best way to handle this IMHO and I have tried a
number of solutions that will work too... LP-BRIDGE, Omni-Rig etc... but
the other fall short when it comes to a transparent share across software
and hardware.

Max NG7M

On Tue, Nov 14, 2017 at 1:23 PM, Jorge Diez - CX6VM <[hidden email]>
wrote:

> Hello
>
> At my station, I have Elecraft K3, Bandmaster III, SixPack, CAT cable
> connected to K3´s RS232
>
> So when I change bands in the radio, antenna is selected automatically
> through CAT cable and band decoder (Bandmaster III)
>
> Today I connected remoterig box, so needed to remove CAT cable to connect
> remoterig.
>
> So now I lost the feature to change antennas automatically when I change
> bands on the K3
>
> How can I do to share RS232 to have CAT and remoterig at the same time?
>
> thanks,
> Jorge
> CX6VM/CW5W
> ______________________________________________________________
> 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
> Message delivered to [hidden email]

k6dgw

Re: sharing K3 RS232 to CAT and Remoterig

In reply to this post by Jorge Diez - CX6VM-2

Before Jorge's question/problem leads to a "perfect storm" on the list
[already full with other stuff], let's all revisit his original
question/problem: "Both antenna switch and Remoterig covet that single
serial RS-232 port on the K3."

The KRC2 can get band data from the ACC port leaving the RS232 open for
the Remoterig. Unfortunately, that solution makes his current antenna
switch excess which may have other implications.

So, rephrasing his question/problem: "Is there a device that will allow
his current antenna switch to obtain the band data it needs from the ACC
connector rather than the RS-232 connector?

73,

Fred K6DGW
Sparks NV

On 11/14/2017 3:59 PM, Jorge Diez - CX6VM wrote:

> Hi John
>
> thanks for the information
>
> N6TV Y box will work for ACC port, but I need something equal for RS232 port
>
> I use a Y cable to ACC to drive bandecoder and amplifier and works fine
>
> thanks,
> Jorge
>
>

tomb18

Re: sharing K3 RS232 to CAT and Remoterig

In reply to this post by Jorge Diez - CX6VM-2

HiSince there has been some discussions about virtual ports and comport sharing I would like to describe the technical aspects of win4k3s comport sharing and what sets it apart from most sharing solutions.
Win4k3 is not a comport splitter. The best way to describe it is that it provides multiple virtual radios to any number of applications or hardware devices. It does this by being exclusively in charge of polling of the radio, and maintaining the state of the radio so that any other application that needs this information obtains it from memory and not from physical access to the radio port. The polling cycle has been optimized so that changes are almost immediate, and the complete api of Elecraft commands are queried for and cached.
If the application needs to write to the the radio, for example to change bands, it gets access almost instantly, by a locking mechanism that is part of win4k3. At that point the state of the radio changes and other applications have that new state.
Another area where win4k3 is different is that there can never be a race condition where excessive commands pile up in the radio command buffer. The response to commands sent to the radio are always a 1 to 1 event. There are never multiple commands sent and the the responses waited for. A single command is sent and then a response is waited for. To date, there is not a single application that will in any way fail when connected to the virtual port facility in win4k3. You can run n1mm, nap3, wsjtx, dxlab, and others simultaneously in full contest mode for days. 73 Tom

Sent from my Samsung Galaxy smartphone.
-------- Original message --------From: "M. George" <[hidden email]> Date: 2017-11-14 7:25 PM (GMT-05:00) To: Jorge Diez - CX6VM <[hidden email]> Cc: Elecraft Reflector <[hidden email]> Subject: Re: [Elecraft] sharing K3 RS232 to CAT and Remoterig
If you want to share the K3 CAT RS232 port and feed with other hardware,
the best way I have found is using Win4K3Suite. Not only will Win4K3Suite
let you share the CAT feed of your K3 with multiple software applications
at the same time, but you can do it with physical serial connections too.
Win4K3Suite connects to your K3's direct CAT/RS232 port and then manages
the feed to other physical ports and or virtual RS232 port pairs for
software connections.

For example, I can have N1MM+, DXLab Commander and WSJT-X all sharing the
CAT feed, each program follows the other if you want them all running at
the same time... and beyond that I can setup another connection to my 2K-FA
amp. In this example, all three software applications think they are
directly connected to the K3. They all can poll the K3 data and they all
receive the output data.

The latest version of Win4K3Suite lets you setup up to 6 Aux/CAT ports for
this purpose. They can be virtual com port pairs for software or direct
connections to physical serial ports for an amplifier, SDA100, auto antenna
tuner etc... It works very well and is rock solid reliable in my
experience.

I have a YouTube video that shows this... around minute 18 of the top of my
head. In the quick demo in that part of the video I should the 2K-FA
following the K3 along with a couple software apps, N1MM+ and DXLab
Commander, if memory serves me correct. Jump to minute 18 a watch for a
few minutes: https://www.youtube.com/watch?v=Ku8Gyl0amRY

I'm assuming this is what you are looking for with your remote rig
connection to your K3. You want the remote rig box to think it's directly
connected to the K3 at the same time other software and hardware think they
are directly connected.

Win4K3Suite provides the best way to handle this IMHO and I have tried a
number of solutions that will work too... LP-BRIDGE, Omni-Rig etc... but
the other fall short when it comes to a transparent share across software
and hardware.

Max NG7M

On Tue, Nov 14, 2017 at 1:23 PM, Jorge Diez - CX6VM <[hidden email]>
wrote:

--
M. George
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Joe Subich, W4TV-4

Re: sharing K3 RS232 to CAT and Remoterig

In reply to this post by Jorge Diez - CX6VM-2

> How can I do to share RS232 to have CAT and remoterig at the same
> time?
You don't since you pass the computer connection through Bandmaster III
using the USB input when the output is connected to the K3 RS-232 jack.
You can not connect both the Bandmaster RS-232 connection *and* Remote
rig to the K3 RS-232 jack at the same time.

However, you can connect Bandmaster III to the K3 ACC jack and use the
BCD data (Yaesu) to indicate the selected band. That will allow you to
connect *either* Remote Rig *or* the local computer to the K3 CAT jack.
Bandmaster will follow band selection from the rig whether you are using
Remote Rig or the local computer.

See the Bandmaster III manual and/or contact the manufacturer for
support.

73,

... Joe, W4TV

On 11/14/2017 3:23 PM, Jorge Diez - CX6VM wrote:

Don Wilhelm

Re: sharing K3 RS232 to CAT and Remoterig

In reply to this post by tomb18

Hi all,

Let me give you a concrete example of why 2 RS-232 ports cannot share
the same port.

Look at the RS-232 Specifications.

The normal voltage for an RS-232 signal line is held at the "Mark level"
of anywhere between -3 and -15 volts in its idle state (as measured at
the receiver).
A "Space" voltage is anywhere between +3 volts and +15 volts (again as
measured at the receiver).

The driver is a voltage source. So imagine 2 drivers trying to put a
signal on a single receiver (or multiple receivers).
The idle driver will be putting a negative voltage on the line, while
the active driver trying to send data will be putting on a positive
voltage. The resulting voltage will be unpredictable and depends on the
impedance of each driver and the resistance of the signal line.

What will happen if you connect two voltage sources (say 2 power
supplies) together, one having a negative voltage and the other having a
positive voltage. They will cancel one another (besides drawing a lot
of current from both supplies).
The net effect is that 2 RS-232 drivers on the same line will "fight"
and proper communications will not be possible.

RS-232 is a point to point operation. A single driver sending data to a
single device. Other receivers may 'listen in' to the communications,
but if 2 drivers are present on the same signal line, the result is chaos.

Virtual ports can take care of that situation, but one cannot simply
parallel live hardware RS-232 signals (with a "Y" cable or other means)
and expect success, so hardware solutions are non-existent. This is a
characteristic of RS-232 communications, and not a problem if you follow
the rules.

73,
Don W3FPR

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Matthew Cook

Re: sharing K3 RS232 to CAT and Remoterig

In reply to this post by Jorge Diez - CX6VM-2

Jorge,

You can reconfigure your Bandmaster III to use the Yaesu BCD band selector
and get this BCD information off the K3 15-way Accessory connector.

The downside is you will loose 60m and 75m as separate outputs.

You'll need to make a new cable between the K3 15-way Accessory connector &
BM III, page 10 of the BM III manual has the relevant info.

If the 15-way connector on the K3 is used already, you can purchase a
y-cable from Elecraft.

73

Matthew
VK5ZM

On 15 November 2017 at 06:53, Jorge Diez - CX6VM <[hidden email]>
wrote:

Mitch Wolfson DJ0QN / K7DX

Re: sharing K3 RS232 to CAT and Remoterig

In reply to this post by Don Wilhelm

Don and everyone,

The RemoteRig RRC actually provides a built-in method to provide this
duplicate CAT data.

Since the RRCs' COM2 are already occupied to tie the two ends together
using CAT, all you have to do is to change each RRC's COM1 to mode-7.
This will duplicate CAT over COM1 and you can use it in for control.
Each RRC will provide the CAT data separately, so you can run a CAT sync
device such as SteppIR, amplifier, etc. on the radio side and a
logging/control program on the control side simultaneously and
independently. Also note that the baud rate on COM1 must not necessarily
be identical with COM2.

73,
Mitch DJ0QN / K7DX

On 14.11.2017 18:04, Don Wilhelm wrote:

> Jorge,
>
> You cannot have RemoteRig and the K3 on the same COM port. You must
> use 2 different COM ports. Otherwise, the K3 drivers and the
> RemoteRig drivers on the RS-232 connection will interfere with each
> other.
>
> If you do a study of RS-232 mark and space voltages, you will find
> that it is a point to point (one to one) communication. Other devices
> may "listen in" to the communications, but they must have all drivers
> disabled and set to a high impedance state. The K3 and the RemoteRig
> do not meet that criteria, so they cannot co-exist on the same COM
> port connection.
>
> The only solution is to use 2 COM ports (one for K3 and one for
> RemoteRig), and if they must synchronize, that will need to be done in
> the computer - but I don't know of any software application that will
> do that synchronization.
>
> 73,
> Don W3FPR
>
> On 11/14/2017 4:26 PM, Jorge Diez - CX6VM wrote:
>> Hello Fred
>>
>> I lost automatically antenna change because I needed to remove my CAT
>> cable
>> from K3 to connect remoterig. Of course if I removed remoterig RS232
>> cable
>> and connect CAT cable all is OK as I had it before connecting remoterig
>>
>> That switch A/B is not an option for what I am looking for, I need
>> both at
>> the same time
> ______________________________________________________________
> 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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>

--
Mitch Wolfson K7DX / DJ0QN
10285 Boca Cir, Naples, FL 34109
Skype: mitchwo
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Jorge Diez - CX6VM-2

Re: sharing K3 RS232 to CAT and Remoterig

In reply to this post by Joe Subich, W4TV-4

Hello Joe

thanks for the help. This will be an option, dont like too much to rewiring
or reconfiguration thinks, dont have skills for that :-(

BUT Mitch point me to a solution I need to try

On remoterig manual
http://www.remoterig.com/downloads/RemoteRig_RRC1258-MkII_Users_manual.pdf
page 217 talk about that

thanks!
Jorge
CX6VM/CW5W

2017-11-14 22:46 GMT-03:00 Joe Subich, W4TV <[hidden email]>:

>
> How can I do to share RS232 to have CAT and remoterig at the same
>> time?
>>
> You don't since you pass the computer connection through Bandmaster III
> using the USB input when the output is connected to the K3 RS-232 jack.
> You can not connect both the Bandmaster RS-232 connection *and* Remote
> rig to the K3 RS-232 jack at the same time.
>
> However, you can connect Bandmaster III to the K3 ACC jack and use the
> BCD data (Yaesu) to indicate the selected band. That will allow you to
> connect *either* Remote Rig *or* the local computer to the K3 CAT jack.
> Bandmaster will follow band selection from the rig whether you are using
> Remote Rig or the local computer.
>
> See the Bandmaster III manual and/or contact the manufacturer for
> support.
>
> 73,
>
> ... Joe, W4TV
>
>
>
> On 11/14/2017 3:23 PM, Jorge Diez - CX6VM wrote:
>
>> Hello
>>
>> At my station, I have Elecraft K3, Bandmaster III, SixPack, CAT cable
>> connected to K3´s RS232
>>
>> So when I change bands in the radio, antenna is selected automatically
>> through CAT cable and band decoder (Bandmaster III)
>>
>> Today I connected remoterig box, so needed to remove CAT cable to connect
>> remoterig.
>>
>> So now I lost the feature to change antennas automatically when I change
>> bands on the K3
>>
>> How can I do to share RS232 to have CAT and remoterig at the same time?
>>
>> thanks,
>> Jorge
>> CX6VM/CW5W
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Joe Subich, W4TV-4

Re: sharing K3 RS232 to CAT and Remoterig

In reply to this post by Don Wilhelm

On 11/14/2017 9:34 PM, Don Wilhelm wrote:
>
> Let me give you a concrete example of why 2 RS-232 ports cannot share
> the same port.

Not necessarily. One can successfully share a device like the K3 CAT
port between two computers (or a computer and SteppIR controller,
computer and Remote Rig box, etc.) by using isolation/steering diodes.
The circuit is shown in the B&B Electronics 9PMDS/232MDS:
http://www.bb-elec.com/Products/Datasheets/9PMDS-232MDS_2917ds.pdf

The "modem sharing" device is not fool proof - it does not resolve the
issues of both devices polling at the same time nor does it resolve
the problem with "unexpected data" received by the inactive device but
it does allow two devices to "share" a third under controlled
conditions.

Note: both "computers" will need serial ports that source at least
+10V in the active state. Many newer USB to serial converters are
3.3V devices and the diode drop will reduce the active level at the
shared device into the "undefined" range which can result in
unreliable operation.

73,

... Joe, W4TV

On 11/14/2017 9:34 PM, Don Wilhelm wrote:

> Hi all,
>
> Let me give you a concrete example of why 2 RS-232 ports cannot share
> the same port.
>
> Look at the RS-232 Specifications.
>
> The normal voltage for an RS-232 signal line is held at the "Mark level"
> of anywhere between -3 and -15 volts in its idle state (as measured at
> the receiver).
> A "Space" voltage is anywhere between +3 volts and +15 volts (again as
> measured at the receiver).
>
> The driver is a voltage source. So imagine 2 drivers trying to put a
> signal on a single receiver (or multiple receivers).
> The idle driver will be putting a negative voltage on the line, while
> the active driver trying to send data will be putting on a positive
> voltage. The resulting voltage will be unpredictable and depends on the
> impedance of each driver and the resistance of the signal line.
>
> What will happen if you connect two voltage sources (say 2 power
> supplies) together, one having a negative voltage and the other having a
> positive voltage. They will cancel one another (besides drawing a lot
> of current from both supplies).
> The net effect is that 2 RS-232 drivers on the same line will "fight"
> and proper communications will not be possible.
>
> RS-232 is a point to point operation. A single driver sending data to a
> single device. Other receivers may 'listen in' to the communications,
> but if 2 drivers are present on the same signal line, the result is chaos.
>
> Virtual ports can take care of that situation, but one cannot simply
> parallel live hardware RS-232 signals (with a "Y" cable or other means)
> and expect success, so hardware solutions are non-existent. This is a
> characteristic of RS-232 communications, and not a problem if you follow
> the rules.
>
> 73,
> Don W3FPR
>
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