Question: Where does the CS202S exit wand connect to on the Apollo 1500 635 mother board? On the wand the 5 wires are green black white red brown, it also talks about an earth ground but there is no wire or place to put or connect one. Answer: Hey Adrian, The control board for your Apollo operator has a series of connectors on it, on the bottom right side of your board you will find a three wire connector. On this connector you will attach the red wire to the input labeled 12V and the black wire to the input labeled GND, this will provide the necessary power to activate your probe. Now on the left side of your control panel you will see several long connectors, the green and brown relay wires should connect to 9 and 10 on the 635 board, GND and Free Exit. Now you’ve got a fully operational exit probe Have questions regarding our products? Our technical sales and support team is standing by if needed, just give us a call at 1-800-730-8382 or contact us by e-mail as we are eager to assist you for all your access control equipment needs. Find the access control product you’re looking for today.