Subject:
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Re[4]: phone cord length
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Newsgroups:
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lugnet.robotics.handyboard
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Date:
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Wed, 5 Mar 1997 08:17:56 GMT
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Original-From:
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Richard Whitehead <RICHARD.WHITEHEAD@nospamUKOS.VARIAN.COM>
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Viewed:
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1995 times
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Ooops, You're right of course!
Richard
______________________________ Reply Separator
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Subject: Re: Re[2]: phone cord length
Author: tomb@netperceptions.com at Internet-Mail
Date: 04/03/97 13:03
> TTL does NOT go down that line, it is RS232 which is commonly used at
> up to 50 feet. However, you might need to use a shielded cable if you
> use a lead longer than about 10 feet.
On the phone cord between the handy board and the charger/interface
card, the signal voltage is TTL levels. There is also charge voltage,
and ground in the other wires.
RS232 level conversion is done by the MAX232 on this card.
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