Actually, the large mainframe would have been a DTE as well. It is the
modem that is the DCE. The specification is really one for connecting
things to modems.
Initially PCs used 25 pin connectors and they were fairly rare in using
them with the correct gender, male (as defined by the pins)
I am not Eric, but the pins are 1, 2, 6, 8 and 9 - those all might have
drivers in the amplifier.
I would suggest that you not break off the pins unless you have a cable
with formed and sealed backshells. If you can open the backshell, just
cut the wires on the 'backside' of the connector.
Hi Eric,
Sorry I'm late replying to your post.
If I read your post correctly, the K3S already has the ability to
communicate with the computer thru the USB port, AND echo the same data
through the RS232 port to the amplifier.
In fact, after digging through the CONFIG Menu I found that
One more question Eric.
If I need to block the TX lines from the amplifier to the K3, which pins
should I break off of the male DB-9 connector?
Thanks again for your help.
Charles K5UA
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Elecraft mailing list
Home:
The pins are normally pressed into the connector. If you can open it,
you can usually pull them out. That way you can test non-destructively.
OM2500A only uses RxD, TxD. It does not assert any other lines. RTS &
DTR are wired straight through, I haven't checked DSR & CTS for continuity.
I
OM2500A must have frequency data, unless you are manually tuning it.
On 12/15/2015 3:45 PM, char...@k5ua.com wrote:
In fact, after digging through the CONFIG Menu I found that setting
AUTOINF to AUTO 1 will send band data on its RS232 port!!
Josh,
You should not refrain from posting information about this amplifier and
its characteristics.
Perhaps I have monopolized the conversations with basic information
about RS-232 and its characteristics (and limitations), but I know
nothing about that specific amplifier. I can only talk
If you need to block the TX lines from the amp to the K3 (or from the amp to the
P3's computer connection if that is also in the system) making a custom cable or
taking a M-F 9 pin adapter with the proper pins broken off can make it easy.)
The key thing to remember with RS-232 is that while
Charles,
At this point, it seems like a silly question. BUT... have you tried
connecting it as the manufacturer (OM-POWER) suggests? If so, what happened?
So far we know that you have tried using some Y-splitter on the RS-232
line. It didn't work, and Don provided a clear and detailed
The OM2500A has 2 serial ports. It is designed to be patched inline between a
computer and the K3.
73,
Josh W6XU
Sent from my mobile device
> On Dec 14, 2015, at 5:11 AM, Don Wilhelm wrote:
>
> Charles,
>
> I don't know the specifics of your OM2500A amplifier, but I
Charles,
I don't know the specifics of your OM2500A amplifier, but I do know
about RS-232.
First, RS-232 is a point to point system. The use of "Y" connectors is
not the norm and are applicable only under certain specific conditions.
Those conditions are that the device added by the "Y"
Fred KE7X
From: Elecraft <elecraft-boun...@mailman.qth.net> on behalf of Don Wilhelm
<w3...@embarqmail.com>
Sent: Monday, December 14, 2015 1:25 PM
To: char...@k5ua.com; elecraft@mailman.qth.net
Subject: Re: [Elecraft] K3S RS232 "Y" Connector causing por
Thanks for the detailed explanation Don. It seems like that is what is
happening, the OM2500 may be sending info back on the line into the "Y"
connector, confusing Na3P on the computer end on making the OM2500 jump
frequency rapidly back and forth between the correct frequency and the
Hi Steve,
I had just sent my last post before reading your post. I think you are
right, I failed to consider signals going from the PC back to the K3S,
they would go directly to the OM2500A as well. I guess using a different
virtual serial port under LP-Bridge as suggested by Larry N8LP is the
Charles,
You should find the amp has a driver connected to pin 2.
To make sense of the signal directions, you have to know whether the
device is configured as DCE or a DTE. Data Communications Equipment or
Data Terminal Equipment. The 'transmit' and 'receive' signals are
relative to the
How easy this would have been if Elecraft had made it possible for the
K3S to communicate with the computer through the USB port _AND_
communicate to the amplifier through the RS232 Port at the same time. As
I understand it, you can use the RS232 port, or the USB port, but not
both.
Thanks
Hi Charles,
When the K3S is using the USB comm port for talking bi-directionally to the
computer, is is also echoing the K3S reply data out the RS232 port for
Amplifiers, Steppir antenna controllers etc to listen to for band and frequency
information.
73,
Eric
/elecraft.com/
On
Charles,
As Fred Cady said in a recent post, it is "all mixed up" and the safest
way to check is to look at the schematic.
It all depends on whether you are a DTE or a DCE device. Prior to the
IBM PC, all was well defined and an RS-232 interface used a DB-25 connector.
AFAIK the IBM PC was
I have an OM2500A amp that works perfectly with my K3S when it is the
only thing connected to the RS232 of my K3S.
I am using LP-Bridge and Na3P to create a panadapter and this works
perfectly when the computer is the only thing connected to the RS232 of
my K3S.
The manual shows how to use a
Hi Josh,
I'm not sure I understand your post.
Are you saying use a single line from the K3S RS232 port to the OM2500A
RS232 port labelled "TCVR", then a second line from the OM2500A RS232
port labelled "PC" back to the computer?
Thanks,
Charles K5UA
Have you tried passing through the amp instead of using the splitter? OM-Power
has two RS232 ports for computer & transceiver.
73,
Josh W6XU
Sent from my mobile device
> On Dec 13, 2015, at 7:52 AM, char...@k5ua.com wrote:
>
>
>
> I have an OM2500A amp that works perfectly with my K3S when
Yes, exactly! OM2500A should echo data through its TCVR<>PC ports to
allow the computer to directly communicate with the K3.
73,
Josh W6XU
On 12/13/2015 1:46 PM, char...@k5ua.com wrote:
Hi Josh,
I'm not sure I understand your post.
Are you saying use a single line from the K3S RS232
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