OAT installation on the flightdeck d180

[Richard Carson]

I am going to install the three wire o a t on a flight deck d180. The installation manual shows the three wires going to the compass 9 pin connector. There doesn't seem to be any other additional reference except the wiring diagram. Will this work? I also noticed that there are only four wires coming from the 37 pin connector to the 9 pin connector yet there will be seven wires installed. Can anyone shed some light on this? Thanks for your help!

 

[DBRV10]

The 4 wires are power/ground/2xdata. What more do you need? The OAT is the other three.

You would think after 17 years if the manual was wrong it would be fixed???

The manual is correct. Follow it.

 

[Richard Carson]

Thank you for your reply and I understand value of the installation manual. Unfortunately I have seven wires going into a nine pin plug and only a 4-wire return to d-37. As an Electronics technician for many years you must have a return and there isn't one except for the compass inputs. there is a second way to terminate it but that requires inputs to the d25 which requires listing g 1 2 or 3 and then a ground. Please check the installation manual and see if you can give me some help here. Without a schematic this is simply a pinout diagram.

 

[Richard Carson]

Oops, swaps d-37 and d25 in the last explanation I didn't have the diagram in front of me.

 

[DBRV10]

As an Electronics technician for many years you must have a return and there isn't one except for the compass inputs.

As an engineer for all my life, in industrial automation and control, and now avionics (basically the same thing), I can assure you that the 4 wires from the Dynon D100 Harness are all you need. Power from the D100 (5v most likely) is going in on Pin 6, Pin 1 is the 0v (GND) and the other two are serial data, and this communicates the compass data and the OAT data. The OAT has three wires (Pins 7,8&2), power ground and an analogue signal which the EDC-D10 takes in and transmits it as digital data along with heading data.

I cant make it any simpler than that. Other than to say trust me, the manual is correct.

 

[Richard Carson]

Thank you for your reply and I appreciate you making it simple although I'm looking more for accurate. It was my understanding that the compass needed two data lines to operate properly and anytime you put another device into something either it has to multiplex the third signal or it has to have its own data line which it does not. That's what I needed to know before I cut the wires too short and it did not operate. As an engineer you should know how often things work in theory but not in practicality without additional information.

 

[DBRV10]

It has two data lines, and packets of data.....From distant memory a Dynon protocol over a RS422/485 network.

 

[Richard Carson]

Thank you. That's the information I was looking for and I sincerely appreciate your time and effort in going back and forth with this. My experience comes from the military and being an avionics technician many many years ago. While basic Electronics have not changed technology of components has dramatically. It would be like comparing a Model A Ford to a Tesla. Thanks again!

 

[DBRV10]

Yeah.....not one signal/data bit per wire any more