Subject:
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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 03:41:08 GMT
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Viewed:
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875 times
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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 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 has 1 Reply:
 | | Re: Possible error in assembly guide.
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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 (...) (24 years ago, 22-Sep-00, to lugnet.robotics.handyboard)
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