I tried the Wiegand interface which is similar and maybe more difficult from the aspect that the line sits at +Vdd and drops low for 20 microseconds for every pulse transmitted.

It worked OK for 20 meters and the spec's say for over 100. A friend of mine tested this to be true.

So I believe with just an inverter or maybe a schmitt trigger even better resuts are to be expected.

Also a resistor (470-1200 ohm) at the end line to +Vdd will help.

Ioannis