I picked up a Hobbyking 150a ESC, and I can't get it to program or set throttle limits.

the instructions say to set throttle limits first. It will not recognize the full throttle input, but will recognize if i go into reverse. This is consistent even if I reverse the channel in the transmitter.

It will beep like it initialized but I cannot get any output.

if anybody has experience or tips with this ESC I would greatly appreciate any advice. I am new to cars, but not new to RC.