This guidance is provided by the ASIS International IT Security Council, based on the cybersecurity controls guidance of the NIST Cybersecurity Framework and the Center for Internet Security Controls (CIS Controls).
This two-page guidance document, titled, “ITSC Top 6 Control Systems Security Recommendations” provides solid guidance that someone responsible for electronic physical security systems can use to implement cybersecurity controls and/or collaborate with their internal IT function or security system services provider to provide strong network and computer security for security systems.
Download here: ITSC-Top-6-R2.pdf .
For additional guidance onsecuring physical security systems and devices,see this 2019 listing of hardening guides and cybersecurity advice from leading security industry manufacturers.