COM PCI controllers
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— presence of at least one COM port on the rear panel of the controller.The term "COM port" usually refers to the RS-232 interface. This is a service connector, nowadays mainly used to connect various specialized equipment — CNC machines, uninterruptible power supplies, programmable logic controllers, some models of routers, etc. In addition, this interface can be used for direct connection between two computers, and also to control the settings of TVs, projectors, audio receivers and other audio and video equipment. A COM port is rarely installed in modern computers during initial assembly, so a PCI controller is usually required to use this interface.