ArcGIS Pro 3.0 API Reference Guide
ArcGIS.Desktop.Editing Namespace / AssociationDescription Class / Terminal2 Property

Terminal2 Property
If the second row represents a device with terminals, the terminal on the second row to connect. Otherwise the value is -1.
Syntax
public long Terminal2 {get;}
Requirements

Target Platforms: Windows 11, Windows 10, Windows 8.1

ArcGIS Pro version: 2.6 or higher.
See Also