Fake product. AliExpress asked me a photo to probe. Looks like aliexpress is not able to eat healthy their own photo. It said Modbus 485. No modbus connection in the device (check the photo)
PLC works as far as I checked. Too small space for RS232 connector, can't plug easily USB-RS232 converter: need to open case or plug RS232 extender, which I don't have; well, not a big deal.