Thanks for the responses. I'm using the Nano Every USB for programming and Serial1 for communicating with a motor driver. The software serial is used to write to a data logger. I'm not having a problem sending bytes to the motor driver, that works and it responds fine, but I am having trouble getting bytes back from the motor driver, so I was just wondering what the buffer size was as I explore different options for capturing the driver return bytes. The same procedure works fine on the Mega, but there I use Serial.event, which I'm told doesn't work on the Nano Every. Changing the core, or whatever, is far beyond by understanding or ability. So, at this point, I'm just curious as to what the Serial1, and software serial buffer sizes are.
Thanks,
John-