 | | Re[2]: phone cord length
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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 (28 years ago, 4-Mar-97, to lugnet.robotics.handyboard)
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| | 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)
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| | 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)
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| | 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)
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| | 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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| | Re: Re[2]: phone cord length
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Speaking of noisy lines, I was thinking of getting one of those telephone cords that's coiled helix-like to colapse the wire. Now that we're discussing this topic, I am wondering if this cord would effect the electronics. The thought came up to me (...) (28 years ago, 5-Mar-97, to lugnet.robotics.handyboard)
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| | Re: Re[2]: phone cord length
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Don't those tend to have swapped conductors too? I thought that the receiver cords were slightly different from the other cords. You might have to crimp new connectors on the end. -Jeremy (...) ___...___ Jeremy Green jag@world.std.com (...) (28 years ago, 5-Mar-97, to lugnet.robotics.handyboard)
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| | Re: Re[2]: phone cord length
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Sorry Fred, but I must respectfully disagree..... Fred G. Martin wrote: (snip) (...) Actually it is phone cords which are the crossover type. Use of a patch- cord tester confirms this. I am not familiar with any RJ11 network cables, but I know that (...) (28 years ago, 7-Mar-97, to lugnet.robotics.handyboard)
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| | Re: Re[2]: phone cord length
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thx for correcting my wording. e.g., instead of saying "half twist" i should say "straight through". anyhow, we agree on the definition of what is a phone cable and what is not a phone cable, we just have a different way of illustrating it. the (...) (28 years ago, 7-Mar-97, to lugnet.robotics.handyboard)
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