3 ms·
Neat. I’m curious about long run serial as someone who’s only done arduino stuff at 5V, what does industrial serial talking over a miles long connection look li
by jazzyjackson 1y ago
Neat. I’m curious about long run serial as someone who’s only done arduino stuff at 5V, what does industrial serial talking over a miles long connection look like? Higher voltage? Repeaters?
- tonyarkles 1y agoAhhhh it was standard RS232 which uses -12V and +12V instead of the 0-5V signalling that TTL serial uses. Otherwise very similar and easy to convert with eg a MAX232.
- kragen 1y agoOften, though evidently not in this case, people use RS422, which is differential, so you can get megabits per second or kilometers, though not both. Shared-bus RS422 is RS485, like LocalTalk or DMX512. The voltages are actually lower than the ±12V normally used by RS232. Converting back and forth between RS232 and RS422 is easy and cheap. https://www.ti.com/lit/an/slla070d/slla070d.pdf https://www.ti.com/lit/an/slla070d/slla070d.pdf is a TI appnote with an overview.