ACOS5 cards are not supported by OpenSC. The previous development work can be found in https://github.com/pacew/OpenSC/tree/acos5 (details in development notes wiki).
The
acos5
branch seems to be dead now. It has not seen any new commits since 2011, and has never been merged into main development branch. However ACS offers prepackaged PC/SC drivers for it's CryptoMate tokens for download. Any information regarding the supported features are welcome.
Usable links: