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Convert RS232 signal to USB

OK it's a CH340 UART bridge, connect VCC to 5v to power it from USB, I'm assuming it's all UART signals, (not RS232), when it's square pin headers like that it's usually UART. Connect GND to GND ...
Jasen  Слава Україні's user avatar
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What do the different LED lights indicate on a DB-9 tester and what can I infer from them?

We don't have a manual for your specific tester device, but it is safe to assume green LED means there is positive voltage and red LED means there is negative voltage. The LEDs indicates status for ...
Justme's user avatar
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