Welcome to EnviroDIY, a community for do-it-yourself environmental science and monitoring. EnviroDIY is part of WikiWatershed, a web toolkit designed to help citizens, conservation practitioners, municipal decision-makers, researchers, educators, and students advance knowledge and stewardship of fresh water. New to EnviroDIY? Start here

Reply To: RS485 without auto direction control

Home Forums Mayfly Data Logger RS485 without auto direction control Reply To: RS485 without auto direction control

#13462
Sara Damiano
Moderator

Ok, I broke out the 3.3V RS485 chip I have (an LTC1480) from the “someday I’ll test this” box. I’d bought the chip ages ago to try out in place of the (5V) MAX485 that I couldn’t ever get to work. But since the automatic flow control always worked nicely, I threw the LT1480 onto a shelf unopened.

Anyway, it worked for me. I made some very small tweaks to the SensorModbusMaster library to see if I could get the timing better, which helped a little, but it worked even without. I didn’t have any issues with the board restarting or anything.

Hm.. In my test I used AltSoftSerial (pins 5&6) as my serial and tried the RE_/DE on both pins 4 and A2. What exactly are your connections and what code exactly are you running?