Subject:
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Re: pcode downloading
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Newsgroups:
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lugnet.robotics.handyboard
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Date:
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Fri, 3 Jan 1997 05:11:40 GMT
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Original-From:
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Karl Altenburg <ALTENBUR@PLAINSspamless.NODAK.EDU>
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Viewed:
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1477 times
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On Thu, 2 Jan 1997, Fred G. Martin wrote:
> Here is the relevant part of the test instructions:
>
> Finally, the MAX232's ability to transmit data to the host computer is • :
> input side of this output stage. Again measure the voltage at pin 3
> of J9---it should now read +10 to +12 volts.
>
> I assume you are successful in getting the -10 v out from pin 3 of J9
> when nothing is attached -- what voltage do you get when you jumper
> pins 6 and 10? You need to get at least +5v; this is the way that the
> HB transmits back to the host computer.
I get -8.9v when its not jumped. When jumped I get some floating values
in the mV range. I checked all of the solder joints. Changed power
supplies. Removed and reseated the chip. Checked power and continuity at
various points around the board and things look fine.
I'm considering ordering a MAX232 from Digikey tomorrow.
> It's surprising that this test would be bad but then DLM synced but
> failed -- DLM's syncing would suggest that the comms work.
No idea.
> Wait a minute! There is a bogus version of the pcode file that might
> not have been purged from all of the on-line sources. This version
I doubt that. I got the file from the web page yesterday and even tried
it with the one that came with a the beta of IC 3.1.
At this point, I'm willing to suspect the RS232 converter.
Thanks for the reply, my five year old is looking forwarded to having a
new robot. :)
Karl R Altenburg altenbur@plains.NoDak.edu
North Dakota State University, Fargo, ND 58105
All things are artificial, for nature is the art of God. SIR THOMAS BROWNE
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Message has 1 Reply:
 | | Re: pcode downloading
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| (...) OK, well I think it is isolated at the pseudo-MAX232 chip. Did you get the +10 v power supply pin on the p-MAX ok? It's at pin 2. Measure it w/r/t ground and you should get +10v. Before you order a real Maxim, check the polarity of your (...) (28 years ago, 3-Jan-97, to lugnet.robotics.handyboard)
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Message is in Reply To:
| | Re: pcode downloading
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| Here is the relevant part of the test instructions: Finally, the MAX232's ability to transmit data to the host computer is tested. Again using pin 7 of J9 as a ground reference, measure the voltage at pin 3 of J9. This is the MAX232's serial output. (...) (28 years ago, 3-Jan-97, to lugnet.robotics.handyboard)
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