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# 7.4 What is the difference between Model 1 and 2?

The Model 2 has:

- index pulse circuit redesigned.
- external latch input
- more flexible watchdog timer
- more options for using spare timer

Reading encoders and writing to DACs happen to be unchanged between the Model 1 and 2. So if that is all you are doing, then it will work even if you use the wrong driver. However if you are using other functions on the board (digital I/O or ADCs) then you will need the correct driver.