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USB to 4 RS232 Ports

A 4 port RS232 Adapter

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This is a simple USB to 4 port RS232 converter board. Modern PCs (cheap ones anyway) generally don't have RS232 ports anymore. I am working on a data acquisition system that will require multiple RS232 ports to talk to different instruments. One of the problems with USB is that you can't guarantee that every time the system boots, the USB components will enumerate to the same devices. It would be possible to use multiple, single port USB to RS232 adapters to connect to the instruments, except that each time the system reboots, the instruments could appear on different TTYs. Using a single USB device with 4 UARTs in it insures that ttyUSB0 connects to the same physical device every boot cycle.

Bill of Materials-USB_Quad_RS232_IF.csv

Bill of Materials for Board

Comma-Separated Values - 2.91 kB - 10/17/2019 at 21:07

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USB_Quad_RS232_IF.pdf

Schematic of Board

Adobe Portable Document Format - 481.97 kB - 10/17/2019 at 21:07

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Bharbour wrote 10/18/2019 at 13:49 point

Thanks, that part looks good! I have been using FTDI parts through the years and have had good luck with them, so they are my first choice for stuff like this.

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Saimon wrote 10/18/2019 at 11:16 point

There is also the CP2108 that is cheaper than the FTDI chip!

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