This has been covered on Toymods before. Have a look there.
Or I may be able to dig out my info tonight.
Basically you have one signal ground wire, two 1pulse per rev signals and one 24pulse per rev signal coming out of the CAS. It's pretty easy to tell which is which with the cover off. Also wire colours changed at some stage, the two CASs I've wired had different colour wiring coming out of them.
And I **think** all signals are falling edge, but again can check later on.
Hen