See Avidyne Service Bulletin 601-00185-006 which can be downloaded from dealers.avidyne.com ...
Release 9 to TAS-A interface with release 9.4 ![https://desk.zoho.com/DocsDisplay?zgId=58375072&mode=inline&blockId=9xd2y53d 549f9acee40c9beaa4f55f920cf5b][1]Config Tool Selection for TAS-A R9 IFD Control and Display Wiring to TAS-A: * **TAS-A RS422 - In: J121-24** (Port4 of 0-5, actually the 3rd RS422 port if ...