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re 90b interface
Skyking
You need the midcontinent relay interface for the 525/90b to get the output of the 90b to the autopilot and the 525. you need this for certification as well. It is an ennunciator panel with pushbuttons. There is a 24 pole relay that switches the 525 inputs and flags from the radios to the gps.
The 90B should have a NEMA rs232 output that will feed the argus with heading, lat/long/ gnd speed, etc. Some are rs422 and others are 232 depending on age and mfgr.
The autopilot / 525 takes 400 hz sine/cosine input. This is available from the 90B. (main reason the 90b/525 combo was so popular). There is no heading bug feedback from the std 525 to the 90B or argus. There is a box that will interface from the 525 and feed the 400 series ap with "bug" input. You need the 400A flight director panel to do this (i believe).
Any output of the argus is going to be a NEMA 422. The argus must rely on its internal database and the nema input for position.
hope this helps
bob
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