Subject:
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Re: Possible error in assembly guide.
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Newsgroups:
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lugnet.robotics.handyboard
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Date:
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Fri, 22 Sep 2000 05:01:18 GMT
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Viewed:
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1060 times
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Are you getting a good ground????????????
If it works.. then hey!
RS232 is +10 to -10 but there is room for slop!
+7 to -7 will work too!!!!!!! It just won't drive a cable to the max
length of the RS232 spec.
Most of the time though people just don't have a good reference point and
ground isn't ground.
richard giuly wrote:
> Near the end of the "interface/charger serial circuit" heading of the
> "Assembling The Handy Board" guide, it says measure the voltage of pin
> 6 of the MAX232, I did that and got -9.5 which is correct. Then I
> connected pin2 of j9 and pin6 of max232 so the green led would come
> on, that worked too. But the voltage on pin 3 of j9 is -7.9 (wrong
> according to the guide) when the green led is on.
>
> When I try jumpering pin 6 to pin 10 of the max232, voltage at pin 3
> of j9 goes to -3 (also wrong). Without it connected, the voltage is -9
> like it should be.
>
> I've ignored these slightly wrong readings, gone through downloading
> the pcode, and it appears to work fine. I think the guide is
> suggesting the wrong voltages, though I might just be testing
> wrong.
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Message is in Reply To:
 | | Possible error in assembly guide.
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| Near the end of the "interface/charger serial circuit" heading of the "Assembling The Handy Board" guide, it says measure the voltage of pin 6 of the MAX232, I did that and got -9.5 which is correct. Then I connected pin2 of j9 and pin6 of max232 so (...) (24 years ago, 22-Sep-00, to lugnet.robotics.handyboard)
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