Brief Description: Dynon AP-74 Autopilot - Part 3.
I wasted a couple hours trying to fabricate a simple bus to gang together all the green DSAB (Dynon Smart Avionics Bus) ‘A’ wires and the blue DSAB ‘B’ wires respectively together in parallel to network the autopilot expansion module (and the servos) to the EFIS. I didn't like how it looked so I used a couple aviation grade terminal strips mounted at 90 degrees to one another behind the main instrument panel instead. This is a little overkill because splicing the wires together would have been adequate. However, I wanted a way to easily disconnect any one networked component for troubleshooting and also needed a spare terminal to tie in a D-60 EFIS in the future. The 90° orientation allows the ‘A’ and ‘B’ wires to remain twisted together (as recommended by Dynon) right up close to their terminals. I don't have my D120 EMS just yet so for now I have the two DSAB wires from the D100 routed directly to the terminal busses (with cheap temporary automotive grade terminals crimped on). Eventually the D-100 DSAB wires will go to the D-120 EMS which will then send two DSAB wires to the terminal busses. I don't have the proper mounting hardware so I used some two sided foam tape to hold them in position until I place my next hardware order.
Next I completed the wiring and physical installation of the AP74 into the right hand console. Then I finished up by upgrading my EFIS (and AP74) firmware to version 5.4, tested and set up the AP74 knob behavior. With a bit of fiddling I got everything working as advertised. I like this Dynon stuff.
