Loopback Test For Serial Ports

Does anyone have, or know where i can find schematic/pinout + software source code (any language) to go with it for the loopback test for the serial ports?

As i understand it, there are several ways to do loopback plug for serial port test, and therefore software must be specific. I found a lot of pinouts for loopback plugs for various existing commercial diagnostics software tools, but i couldn't find any free software that do these tests. And i was sure i saw basic source years ago, but now when i need it i can't find anything

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