As I found out, if you are interfacing to a PC, you do not need to use anything as fancy as a MAX232. In fact, a plain old 74HCT00 (quad nand gate) will suffice. Simply take PC output connect it to a 22k resistor and tie it to the inputs of one of those gates. The output of that gate will be the RS232 input into your device.
Similarly, take the output of your device, tie it to the inputs of another gate and that output will be the input into the PC.
This is not fully RS232 compliant but it's awfully cheap and works wonders with PCs.
Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
Read Where should I post X? if you're not absolutely sure you're posting in the right place.
Please read these before you post! —
Posts may use any of the Perl Monks Approved HTML tags:
You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
- a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
Link using PerlMonks shortcuts! What shortcuts can I use for linking?
See Writeup Formatting Tips and other pages linked from there for more info.
| & || & |
| < || < |
| > || > |
| [ || [ |
| ] || ] ||