Market Opportunities and Solutions for Upgrading Legacy Access Control to QR Code Access Control   QR code access control systems , with their convenience, scalability, and lower costs, are gradually becoming the preferred upgrade solution for access control management systems. For overseas system integrators, software developers, and low-voltage security distributors, QR code access control not only helps customers enhance the intelligence level of access control systems but also brings broad market opportunities and more profit space.   This article will introduce the market potential of QR code access control  technology and elaborate on how simple hardware replacement and protocol support can achieve seamless upgrades of traditional card-swipe access control systems, helping system integrators and software platforms quickly implement QR code access control solutions.   Limitations of Traditional Card-Swipe Access Control Systems Traditional card-swipe acc...