Subject:
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Re: 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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Wed, 5 Mar 1997 01:51:08 GMT
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Original-From:
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MAR ERICSON <MAR@antispamCOOPER.EDU>
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Viewed:
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1996 times
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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 that this cord is like a long
"inductor" and it may slow the rise and fall of the 5V levels. Also,
generating magnetic fields within the "inductor" may cause interferance.
Does anyone have any experience with this?
-----------
ericson mar
Master of Engineering Candidate
Project: Mobile Robotics
mar@cooper.edu
Department of Mechanical Engineering
The Cooper Union for the Advancement of Science and Art
-------------------------------------------------------
On Tue, 4 Mar 1997, Mike Ross wrote:
> On Tue, 4 Mar 1997, Richard Whitehead wrote:
>
> > 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.
>
> 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 susceptible to noise. I use a 6 foot unshielded phone cord
> in a noisy environment with no problems.
>
> -mike
>
>
> * Michael L. Ross/C33 | Lockheed Martin Eng & Sci Svcs Co. ****
> * Robotics Department | 2400 Nasa Rd. 1, Houston, TX 77058*****
> * (281)333-7094; (281)333-6071 fax* #include <disclaimer.h>*
> * Finger me for my public key. mross@outland.jsc.nasa.gov ****
>
>
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Message is in Reply To:
 | | 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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