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Mass produced devices are typically pre-registered in the driver config file, but other products, particularly bespoke devices often won't be in the configuration file, so the serial driver (in this case) won't recognise them as belonging to it. This problem is resolved by a configuration file with each (serial) driver that lists every product (ie every PID/VID combination) that can be used with the specified driver. There doesn't appear to be a usable "class of device" concept (eg 'Generic Serial Port') even for products using the same chipset. This property of uniqueness means that even two different products both using the same USB serial chipset effectively need different drivers.
#How do you set up usb serial controller d in mac drivers
The VID/PID tend to be unique to each different product so that drivers can identify their own device/product in a system with multiple USB devices (small bespoke devices may violate this guideline). So that each software driver can identify it's own USB device, every USB device has a Vendor Identifier (VID) and a Product ID (PID). There is a further complication in that many products (serial ports or other) might want to implement a USB interface.
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However a serial driver needs to sit on top of the USB interface to make the device actually behave like a serial port. The standard operating system USB driver can recognize a USB device and display information about it in System Profiler. Having plugged in (and powered on) the USB serial port device, it will show up as a USB device on most operating systems without further action. A USB serial device has three components needed to make it work as a traditional serial port (by which I mean a device in /dev that a terminal program can be connected to: