Hi! Does anyone know how to work with this kind of rs232? It's from the weight indicator model XK3190-A12E. I wanna transmit data from my weight indicator, but it doesn’t seem to work and no voltage can be read through it.
RS232 is an old, well defined standard. There is no "this" or "that" RS232.
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None of the specifications I can find mention any type of serial output. What documentation are you finding that shows a serial output from your device?
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The manual I found of A12E (https://www.zemiceurope.com/media/Documentation/A12(E)(OC).pdf) shows where the location of the rs232 is and says it can be used to transfer data, but I'm not quite sure how.
Put a 220 Ohm resistor in series with one leg of a red LED. Connect the other LED leg to ground and the end of the resistor to the TX data connection. Test for data. If no LED blink, reverse the LED and resistor connections to the board. If there is any data being transmitted, the LED will blink when connected one way or the other.
Is there any way I can un-isolate it? Sorry if the question is uninformed, I'm just really new at this.
The "CN4" are the serial data connections!!!!!
The short answer is no.
The longer answer is: not without a schematic to know what parts are supposed to be there. Plus a good look see around to see what other parts aren't populated for the serial data option. And even if you did add all the parts, there's no guarantee that the firmware in the board's processor has support built in.
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