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RS232(?) Data port on cheap Chinese caliphers/comparators

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silenter:
Hi everyone. I bought a long time ago one of those cheap chinese comparators that you can find off ebay:

  https://www.aliexpress.com/item/RS232-9holes-data-output-for-digital-indicator-electronic-indicator-data-output-link/1227581712.html

Arguably this thing has a data port, but it came without a cable and I would like to get off some readings.
There's not much I could find about the 4-lead port and/or the connector. They mention rs232, but I assume it's just about the bundled adapter.

Before I spend some time on it (I would probably just solder 4 wires directly on the tracks), has somebody already tried to look into it and knows what sort of pinout/protocol is it?

sokoloff:
You're not the first to try this, of course.

Have a look at:
https://www.robotroom.com/Caliper-Digital-Data-Port.html
https://hackaday.com/2010/12/15/reading-a-digital-caliper-with-a-microcontroller/
https://www.instructables.com/id/Reading-Digital-Callipers-with-an-Arduino-USB/

SparkyFX:
check out TouchDRO, there are descriptions of the protocols found in various calipers.

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