I have a half duplex RS485 Master - Slave network using MAX485 ICs. I have found that I need to keep the Driver Enable pin HIGH after Serial.write(), otherwise the ATmega328 hangs after 5 minutes or so. I have experienced this behavior when using a delay of 1, but If I change it to 20, it seems to b…

RS485 - How long should you keep the Driver enable pin HIGH? - #11 by system - Networking, Protocols, and Devices

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