#1- dtc -O dtb -o enable-uart5-00A0.dtbo -b 0 -@ enable-uart5.dts
#2- cp enable-uart5-00A0.dtbo /lib/firmware/
#3- echo enable-uart5 > /sys/devices/bone_capemgr.*/slots
#4- then I ran a bonescript:

var b = require('bonescript');
b.pinMode("P9_11", b.OUTPUT, 6, 'pullup',  'fast', printStatus);

#5- connected output pin from rfID receiver to pin p9_11

#6- cat /dev/ttyO4