The job is done, what I ended up with was two photo eye sets across the gate area, free exit loop, and reverse loop, and pressure switches on both ends of the sliding gate. The gate controller and motor have pressure sensing inside, reversing etc. I used linear remote systems and a powermaster controller.
I like the powermaster, as the motor to gate chain is all gearbox, not chain, and there is only one more little chain that drives the end stops.
The gate is 32' across the driveway. The customer needed a doorbell at the gate for deliveries. So, as I had an extra remote input on the reciever, I was able to have that last input run a RIB in the building, which rang the bell at the recieving dock. For the doorbell, I took one remote, and soldered on a wire to the back of the remote, set the code, and

Scotchcoated

:laughing: it. The wire I ran to a typical doorbell button which mounts on the outside of a post. Works great.