There are a few options with respect to the single ended data and control signals for modification on this EVM. Jumpers J1 through J4 all contain pads that are blank by default. For D, DE, and /RE signals there are 0603 sized pads for either pull-up or pull-down resistors to have a default logic on these pins with the added benefit of still being able to external signals to this pin. The R pin also contains a pull-up resistor 0603 sized, as is common in UART based applications, as well as a 0603 sized pad to ground for a capacitive load in case testing requires capacitive loading on the R pin.