Some of them are connected to native serial ports, and some have USB->RS232 adapters. I am communicating to them via the serial port interface and their /dev/ttyUSB* device nodes.

Before USB ports became standard on PCs, several devices connected through a serial port. They're obsolete in many ways, but they still see some use.

I recommend the StarTech 1-Port USB to RS232 DB9 Male to Male Serial Adapter Cable (ICUSB232V2). It has a 3 foot cable and uses the FTDI chipset.

FTDI is selling a USB-RS232 adapter as a replacement for DB-9 connectors. They come with USB male or female connections depending on the application and have the same serial footprint and pinout ...

You would simply hook the serial interface of the dongle up to the existing serial port of your equipment. By designing your own dongle, you can also optimize the line driver or transceiver for your ...

How to Redirect COM1 to a USB Port. Some software and specialty hardware requires you to use a traditional serial port. Serial ports have been around for decades and work by transferring one bit ...

So, I sometimes use USB-to-Serial converters.” Further proof came recently when a company previewed for me a new benchtop test instrument that has just one communications port: serial RS-232. I will ...

But the problem is that an RS232 serial port operates with 12V logic levels and the JTAG side of the programmer needs to operate with the logic levels native to the device you’re programming.

I know, RS-232 is not gone completely but in most things it has disappeared. Recently I bought a new laptop to use in my ham shack. I have several older accessories that use RS ...

In the olden days, plugging something into your computer—a mouse, a printer, a hard drive—required a zoo of cables. Maybe you needed a PS/2 connector or a serial port, the Apple Desktop Bus ...