March 17, 20206 yr Hi all I was hoping I don't need to crack out the old OScope to figure this out, hopefully somewhere on here already has this on hand: What are voltage levels of the RS232/Serial port on the Axpert? Edited March 17, 20206 yr by Gnome
March 17, 20206 yr It's a standard RS232, therefore the voltage can be anywhere between -25V to +25V Long story short -USB to TTL cable converter is NOT suitable. You need a proper USB to RS232 converter.
March 17, 20206 yr 9 hours ago, Gnome said: What are voltage levels of the RS232/Serial port on the Axpert? Without measuring it, I believe it's ±12 V.
March 18, 20206 yr Author Thanks guys. I was hoping to connect to the Raspberry Pi without needing a MAX3232 but seems that is unavoidable. At times you can get away with just resistors but the differential is too large and negative voltages is obviously a problem. Edited March 18, 20206 yr by Gnome
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