I think he is using the ICM40, which allows you to use their built in traffic controller or a separate
TA controller. If you are using an ICM40 then you will have to change the Exclusive Function2 because by default it requires 12V input and the setting allows you to change it to a grounding input, which is what the 4200
TA controller puts out.
For Wiring DL1-L goes to pin T1 on the 4200 and just wire them in order so DL2 goes to T2, Ect. After you wire it if for some reason the right and left arrows are backwards you can fix it by changing the Exclusive Function1 setting instead of having to switch the wires around.
If you need the instruction manual I uploaded it on Photobucket.
http://s1370.photobucket.com/user/rgscommkb/library/Rontan Instructions?sort=2&page=1