The reader does either
secure sector or CSN, but not both unless it is iClass CSN.
By default the CSN is
disabled so that it can read the secure sector of our cards....
Pink is A/Y and Tan is B/Z which is only on readers
that have been ordered with 485 configuration. MT15-485 is printed on every
reader's sticker.
A/Y is negative or inverting pin, B/Z is the positive...