Hello All,
I'm new to this forum.
I have come across a universal IO controller from a reputed brand.
While studying the circuit, I came across the Universal Analog IO circuit(Supposedly) which can output 4-20mA and 0-10V from the same pin.
The circuit looks simple but I'm unable to analyze the working of it. Attached is the schematic.
Kindly help me understand the working and if the traced circuit is correct(However I have verified the same 2-3 times).

Thanks in Advance!!

 

the feed 1 & 2 look like differential current output
https://www.st.com/resource/en/datasheet/ts922.pdf is SC proof extended output current op amp
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but the output network does not look right ← it likely should limit the current at positive logical-High output
but the base of the BC807 is "shorted"/tied to its E ???