There is no document or example in UPA package regarding the usage of DACS Lib to connect to DACS server. It only provides a document and example for generating DACS Locks.
Currently, the only public API that can connect to DACS server is Open DACS. It has three versions: Open DACS C++, Open DACS Java and Open DACS .NET.
For more information regarding Open DACS APIs, please refer to https://developers.thomsonreuters.com/thomson-reuters-enterprise-platform/apis-in-this-family