from what I understand of two wire systems (such as with your camera) Not only do you have to jumper your T+ with your R+ and your T- with your R- but you also need two 120 ohm resistors one on each end of your bus (your termination lines) Think of it as two wires and on each end you have a 120ohm resistor. Then you connect your signals wires in between the two resistors. The easy way of doing this for one camera is to jump a resistor across the screws for your T+ & T- and across the screws on the camera.
