![]() But as USB CDC devices became very popular, it has become very easy to attach a lot of devices to a single machine. Even then, the chances of having more than nine serial ports on a single machine was slim unless you had a bunch of those cards installed on the same machine. You could have more if you had a PCI or ISA Serial Port expansion card installed. In the olden days, PCs and laptops used to be equipped with one or two serial ports. An example of such a device is in the image below as shown in Windows Device Manager. This also allows for a range of products such as Numato Lab’s USB GPIO and USB Relay modules to use USB but still have the ease of use Serial interface offers. USB specification defines a class ( Communication Devices Class) for using USB transport and infrastructure to emulate serial port interface thus legacy applications can continue operate even when the hardware uses USB. Although PCs and Laptops don’t come with built in serial ports anymore, serial port interface emulated over USB is very popular among DIYers/hackers and with certain products. ![]() Serial ports were used in a verity of applications reliably for a very long time now.
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