Found some manuals from PEFIS. Two of them include documentation for software that provides an interface to the FK6xx series fingerprint time attendance terminals. The other provides instructions for the Time Man III fingerprint recognition system.
While both of the FK manuals are written for the FK6xx software, it looks like FKAttend is designed to be used to manage the data collected by fingerprint sensors, while FKRealSvr could be used as an enhancement by providing live data and real-time monitoring.
FKAttend: https://nkinternet.wordpress.com/wp-content/uploads/2024/06/fkattend_manual.pdf
FKRealSvr: https://nkinternet.wordpress.com/wp-content/uploads/2024/06/fkrealsvr_manual.pdf
TM3: https://nkinternet.wordpress.com/wp-content/uploads/2024/06/tm3-menual.pdf
Archive.org link to PEFIS if you want to read through their website: https://web.archive.org/web/20180804072505/http://pefis.cn/