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Re: RS-232 TTL Board?
Simple Explanation here...
The purpose of that board is to convert voltage levels. Standard logic levels for ICs and small devices is 0-5v, like the RC or OI. However, when transmitting data over a wire, it is nice to have more noise margin, and one way to achieve this is to jack the voltage differential. RS232 voltage levels do just that. Your standard legacy pc has a serial port that uses RS232 voltage levels, whereas the RC has a TTL level serial port. I built one of those modules last spring to interface the edubot to a matrix orbital lcd screen. The link below has more detailed information. http://www.beyondlogic.org/serial/serial.htm#1 I assume, w/o having access to a kit right now... that the rs232->ttl converter is just a max233cpp chip or equivalent with appropriate connectors. The digikey part number for that chip is: MAX233CPP-ND The datasheet is: http://rocky.digikey.com/WebLib/Maxi...u%20MAX249.pdf |
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