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So that this finds its way into the archives here is what happened:
I was attempting to pass data from a data box to RS232 to Ethernet (Cat-5)
between rooms in my house and then back to RS232 and into a computer's
serial port. The data box kept resetting itself when I connected via some
DB9/25 to RJ45 adapters. It seems that you can't wire the adapters straight
across. Jerry correctly diagnosed that the problem was that there was
feedback, rather than weak signal as I had originally thought.
In a typical DB9 setup Transmit is pin 2 and Receive is Pin 3.
http://www.pin-outs.com/datasheet_11.html
Jerry said that I should probably be trying to make a null modem (which
incidentally went over my head):
http://www.loop-back.com/null-mod.html
But getting back to the idea that there was feedback going to the box, I
left the receiving adapter alone but changed the transmitting adapter (the
one nearest the data box) so that pin 3 was omitted and the wire that
should've been in pin 3 was placed in Pin 2. I did this by trial and error
and it works so I am pleased even though my understanding of the big picture
is somewhat limited.
Patrick White
----- Original Message -----
From: "Randall Kurzon" <rkurzon@xxxxxxxxxxxxxx>
To: "Patrick White" <simgenie@xxxxxxxxx>
Sent: Sunday, September 30, 2001 8:26 AM
Subject: Re: Ethernet / RS232 Signal Booster
Could you please share the specific instructions Jerry gave you that
solved the problem. Someday I or others may have a similar problem.
Regards,
Randall
rkurzon@xxxxxxxxxxxxxx
Saturday, September 29, 2001, 23:13:30, you wrote:
> Thanks to everyone, especially Jerry who put me onto the root of my
problem
> which wasn't weak signal but rather a feedback problem. I was able to fix
> the problem by following some instructions from Jerry in reworking one of
my
> connectors to eliminate a feedback problem.
> Thanks again,
> Patrick White
> ----- Original Message -----
> From: "Jerry" <drwar@xxxxxxxxxxxx>
> To: "'Jim Gavey'" <Jim@xxxxxxxxx>; "'Patrick White'" <simgenie@xxxxxxxxx>;
> "'Omega'" <omega-list@xxxxxxxxxx>
> Sent: Saturday, September 29, 2001 4:11 PM
> Subject: RE: Ethernet / RS232 Signal Booster
> I believe he is talking about a repeater not a signal amplifier. He
> indicated these are RS232 levels not a sat LNB output. Besides his
problems
> most likely lie elsewhere. Cat- 5 cable is good for 100M carrying Rs232
> signals if wired properly.
> Jerry
>> -----Original Message-----
>> From: Jim Gavey [mailto:Jim@xxxxxxxxx]
>> Sent: Saturday, September 29, 2001 4:02 PM
>> To: Patrick White; Omega
>> Subject: RE: Ethernet / RS232 Signal Booster
>>
>>
>> Pat - yes I have long lengths of cable that require in-line
>> amplifiers.
>> Cable stores have them as do satellite TV retailers. I
>> recently replaced an
>> old one by a Direct TV DSS model manufactured by Thomson
>> Electronics. It
>> was $19.99.
>>
>> Jim
>>
>> > -----Original Message-----
>> > From: Patrick White [mailto:simgenie@xxxxxxxxx]
>> > Sent: Saturday, September 29, 2001 11:20 AM
>> > To: Omega
>> > Subject: OT: Ethernet / RS232 Signal Booster
>> >
>> >
>> > My dilemma is that I am trying to send data from one side
>> of the house to
>> > the other that comes out of a data box. I have CAT5 cable
>> running through
>> > the house which works fine for my LAN, but the distance makes the
>> > signal too
>> > weak so the data box is constantly resetting. I have an insulated
>> > length of
>> > RS232 cable that works, but is not inside the walls.
>> >
>> > Has anyone made use of an ethernet / RS232 signal booster.
>> I am trying to
>> > find who would have something like this. Would boosting the
>> > signal strength
>> > of the coaxial input to the box improve the strength of the
>> output signal?
>> > Any suggestions would be greatly appreciated.
>> >
>> > Patrick White
>> >
>> >
>> >
>>
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