The A series units do not come with an internal voltage divider card unless you order it special (Automation Interface Card). I think you will find that pins 5 & 6 have nothing connected. The other pins work as labeled.
You have everything you need to connect up the A120. The RAV-01 is installed inside and the TIP VOLTS connections goe to the RAW ARC VOLTS (undivided volts) in the unit (see their manual to find the spot to connect) The RAV-01 ships with two cables. You don't need the 4 pin cable. Just the shielded stereo cable. It plugs in the jack on the RAV-01 and gets routed out to the THC Sensor PWM module on the outside.
The MIC-02 cable plugs in the CPC connector in one end and into the 4 pin jack on the THC SENSOR PWM on the other end.
Thats it. you don't need any other cables, cards or clips.
The DTHCII manual covers all of this in detail with illustrations and stuff for the TD units