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Thanks for that. I am using a Yosemitech Y511-A with a Hydros CTD (Gen 1). My code is fairly similar to yours. I notice that you use pin 22 to power the Y511 (line 145) where I have ‘-1’. I also don’t see the line ‘<span class=”crayon-i”>AltSoftSerial</span> <span class=”crayon-v”>altSoftSerial</span><span class=”crayon-sy”>(</span><span class=”crayon-cn”>6</span><span class=”crayon-sy”>,</span><span class=”crayon-cn”>5</span><span class=”crayon-sy”>)</span><span class=”crayon-sy”>;'</span> in my code. Do you think this could be causing the problem?
FYI, more information (and my current code) can be found in this post:
https://www.envirodiy.org/topic/hydros-ctd-10-regularly-dropping-out-9999/
Since posting the topic above I have attached ferrite collars to no avail and inspected all sensors and cables for damage (which there is none). I have also switched the TTL-RS-485 board on the MODBUS wing with another (working) TTL-RS-485, which also doesn’t solve the problem. I can get a perfect CTD record by removing the MODBUS wing. The strange thing is that I have 6 other sites with identical code that work perfectly.
I would love to solve this issue without having to install a secondary board.
James
