Well, it’s dirt cheap, but not really a USB to RS-232 converter …
↓↓↓ Complete description, time index and links below ↓↓↓

It did work with the RS-232 port of my OWON P4305 power supply (the one with the dead LCD) right away. But I was a little suspicious because there was nothing inside it besides a chip and maybe a capacitor. So I broke out the oscilloscope.

Turns out it’s just a CH340 USB to serial converter. Signal levels and rise/fall times are not RS-232 compliant and it wouldn’t survive talking to a real RS-232 device. Side note: The OWON P4304 makes an effort, but it’s also not RS-232 compliant.

00:00 Intro – it was already featured in a mailbag
00:32 Connecting – it to a Windows 10 PC, it’s a CH340
01:34 Testing – it with my OWON P4305 lab power supply
02:49 Measuring – its signals, they are not RS-232 compliant
05:57 Innards – view through the semi-transparent case
07:27 Software – on CD (!), just the CH340 drivers
07:45 Wrap-up – not really a USB to RS-232 converter, bye

Reviews [ Ссылка ]
Mailbag: MC14490, MAX31855K, USB to RS232, USB to TRRS and Lapel Mic [ Ссылка ]

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