How can I switch the EV board from 3-wire to 4-wire communication, and vice versa?
A. 3-wire or 4-wire communication is possible by connecting the DI and DO pins together or keeping them separate, respectively. This is accomplished by inserting or removing the shunt on JU4. The 3-wire mode allows the user to use a single line, DIO, for communication with the MAX1464 by shorting the DI and DO pins together.
