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Sci.Electronics.Basics -> rs232 question
There are 3 messages in this thread.
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Author: malua mada!Date: 13:57 01-04-08
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I have a controller that talks rs232 ,driven by a MAX232.
3 wires only.
I connect the computer to it: works fine.
I am connecting a StarTech NETRS2321E Net adapter to it. Won't work.
Loopback plug instead of controller: works fine.
Since the harness on the controller side includes a DB9 tap I decided
to hook the computer into that, and LO! that causes it to work!
I get communication on both channels , one from serial port, one from
NETRS232.
If I unplug the serial port cable at the controller the NETRS232
quits receiving data.
If I unplug the serial port cable at the computer the NETRS232
continues receiving data.
What is going on? What changes to the controller circuitry would help?
Cheers
f
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Author: JamieDate: 20:40 01-04-08
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malua mada! wrote:
> I have a controller that talks rs232 ,driven by a MAX232.
> 3 wires only.
> I connect the computer to it: works fine.
> I am connecting a StarTech NETRS2321E Net adapter to it. Won't work.
> Loopback plug instead of controller: works fine.
> Since the harness on the controller side includes a DB9 tap I decided
> to hook the computer into that, and LO! that causes it to work!
> I get communication on both channels , one from serial port, one from
> NETRS232.
> If I unplug the serial port cable at the controller the NETRS232
> quits receiving data.
> If I unplug the serial port cable at the computer the NETRS232
> continues receiving data.
> What is going on? What changes to the controller circuitry would help?
> Cheers
> f
>
Maybe you're not using the correct on COMMON on the plug?
--
"I'd rather have a bottle in front of me than a frontal lobotomy"
"Daily Thought:
SOME PEOPLE ARE LIKE SLINKIES. NOT REALLY GOOD FOR ANYTHING BUT
THEY BRING A SMILE TO YOUR FACE WHEN PUSHED DOWN THE STAIRS.
http://webpages.charter.net/jamie_5";
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Author: malua mada!Date: 21:04 01-04-08
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On Apr 1, 6:31=A0pm, Jamie
<jamie_ka1lpa_not_valid_after_ka1l...@charter.net> wrote:
> malua mada! wrote:
> > I have a controller that talks rs232 ,driven by a MAX232.
> > 3 wires only.
> > I connect the computer to it: works fine.
> > I am connecting a StarTech NETRS2321E Net adapter to it. Won't work.
> > Loopback plug instead of controller: works fine.
> > Since the harness on the controller side includes a DB9 tap I decided
> > to hook the computer into that, and LO! that causes it to work!
> > I get communication on both channels , one from serial port, one from
> > NETRS232.
> > If I unplug the serial port cable =A0at the controller the NETRS232
> > quits receiving data.
> > If I unplug the serial port cable =A0at the computer =A0the NETRS232
> > continues =A0receiving data.
> > What is going on? What changes to the controller circuitry would help?
> > Cheers
> > f
>
> Maybe you're not using the correct on COMMON on the plug?
>
Well now it works by itself.
I'll see if it has to do with temperature after I shut it off tonight.
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