Can someone explain in simple English how to connect the Rs485 bus of a QSTD2408 DVR to the PCB board on a COP CD55NVT PTZ? I will be using cat6 cable and the distance between the DVR and PTZ is about 150 feet. Page 33 of the CD55NVT manual does not show exactly where to connect the A+ and B- wires and if I need to use the 120ohm resistor? thanks very much