This is a board that breaks out four serial ports from a single USB connection.
It uses the FTDI FT4232H IC.
It provides a 0.1" header strip for each of the four ports. Each 12-way header has:
All the RS-232 signals are at 3V3, but are 5V tolerant for easy interfacing.
The board has red TX and green RX LEDs for each serial port. The LEDs are balanced for brightness, so the green doesn't overwhelm the red. Also, neither colour is so bright it will blind you.
Often I have several serial devices plugged into my computer. Managing all those cables is a pain and each one takes up valuable USB ports (especially annoying on a laptop).
This board is meant to solve that problem.
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I'm an electronic engineer/embedded software developer/maker of things from Nottingham, UK.