I want to run electricity to my barn. About a 70ft run underground in metal conduit. Already have barn wired for multiple lights and multiple 120 outlets. Which wire will be best to use? And do I have to put a GFCI in the barn?

First time post. I am trying to install a photoelectric eye that when interrupted or passed through will prevent the gate from closing. I have a sensor (Enforcer Reflective Photoelectric Sensor E-931-S35RRQ) and a Chamberlain Elite Robo Slide Gate Operator with an Elite Robo Surge Suppressor. Attached is a picture of the Sensor wires, Gray=NC, White=COM, Black=NO and the Surge Suppressor contacts. We can designate the middle set of contacts 1-6 (Safety Loop1-4, and Exit Loop 5-6). I currently have White/COM attached to 3 and Black/NO attached to 4 as shown in the picture. With this connectivity, if the gate is closing, blocking the beam or passing completely through the beam (allowing it to hit the reflector again), stops the closing gate and reopens it (the desired outcome). If the gate is open and the beam is blocked, nothing happens. However, if something passes completely through the beam, the gate is triggered to close. This is problematic as we frequently want to leave the gate open and have movement in and out of the gate without it closing. Kids leaving on bikes will be shut out and the man picking up the garbage will be trapped inside the gate after he passes through the beam. Also, if the gate is closed, passing through the beam triggers it to open. This is problematic as anyone outside of our gate can just trigger it to open at will. There is a similar post from a while back at [url]https://www.doityourself.com/forum/electronic-home-security-systems-alarms-devices/572691-wiring-photoelectric-eye-automatic-gate-opener.html[/url], but it involves a different hardware and the recommended wiring (above) does not seem to work with my hardware. I have also tried White/COM to 1 and Black/NO to 4. This scenario is best as the closing gate still stops and reopens when the beam is passed through. Additionally, it cannot be triggered to open from a closed state by the sensor. However, it does still close from an open state when the beam is passed through as described in the 1st wiring scenario above. Is there a wiring scenario that will have the gate stop closing when the beam is interrupted or passed through, but not have the gate be triggered to close from an open state or to open from a closed state by the sensor? In other words, I'd like the sensor to only interrupt a closing gate. Thank for the help. [attach]102813[/attach] [attach]102814[/attach]