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1. OK 2. OK 3. This looks correct; you'll initialize the Serial port using the standard Arduino syntax specifying baud rate, size, parity, and stop bit(s). Device is address #1...

I don't see anything obvious, but I'm not familiar with your device. Here's how I would proceed: start with as small a working example as possible and build upon that....

To read multiple devices, you'll instantiate each one as a separate object: ``` cpp ... ModbusMaster device1; ModbusMaster device2; ... Serial.begin(19200); device1.begin(1, Serial); device2.begin(2, Serial); ... ```