Pin Configuration(Positive and Negative)

I have some Cambium devices but I am confused about pinout because some of devices have (4,5 pins are positive and 7,8 are negative pins) and some have just opposite of this (7,8 pins are positive and 4,5 are negative pins).
please help me to find out its pinout.
i have cambium Force 300CSML,FORCE 325,PPT 550,FORCE 130, ePMP 1000,Force 190,Force 200L,Force 325, Force 130.