Subject:
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Re[2]: phone cord length
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Newsgroups:
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lugnet.robotics.handyboard
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Date:
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Tue, 4 Mar 1997 09:10:45 GMT
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Original-From:
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Richard Whitehead <Richard.Whitehead@{ihatespam}ukos.varian.com>
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Viewed:
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1957 times
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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.
Richard
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Message has 4 Replies:
 | | Re: Re[2]: phone cord length
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| (...) 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. (28 years ago, 4-Mar-97, to lugnet.robotics.handyboard)
| | | Re: Re[2]: phone cord length
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| (...) No, the MAX232 chip on the charger board converts from 12V RS232 coming out of the serial port to TTL level RS232. What goes down the line to the Handyboard is 5V RS232, which goes straight into the HC11 and at only 5V levels is more (...) (28 years ago, 4-Mar-97, to lugnet.robotics.handyboard)
| | | Re: Re[2]: phone cord length
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| (...) No, that is wrong; the RS232 is converted to TTL at the serial interface board, so you do have TTL on the phone cord. In any event, I would guess that 50 ft. would not be a problem; we're talking about 9600 baud here which is pretty slow. BTW, (...) (28 years ago, 4-Mar-97, to lugnet.robotics.handyboard)
| | | Re: Re[2]: phone cord length
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| (...) One could consider plastic optical fibre for that length. The diameter is small. It is flexible. No shielding required. You could have one for each direction of signal. Motorola had a plastic optical fibre kit years ago. Have fun. ---...--- Ed (...) (28 years ago, 4-Mar-97, to lugnet.robotics.handyboard)
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