Hi,
like this:
4 x (Voltage, Current, Temperature) --> 12 CH ADC --> microcontroller/UART --> TTL/RS485 --> 200m cable --> RS485/TTL --> UART/microcontroller --> 12 CH DAC --> 12 x ICL7107 --> 12 x display
I agre with FvM to use such a solution:
4 x (Voltage, Current, Temperature) --> 12 CH ADC --> microcontroller/UART --> TTL/RS485 --> 200m cable --> RS485/TTL --> UART/microcontroller --> dig controlled display
Now it depends on your display requirements:
Mechanical size, mechanical position, interface...
Theoretically you could display all 12 values on a singe 4 x 20 character LCDisplay.
If it´s just for temporary use:
Then I recommend a PC (or raspberry or similar) at the receiver side. Display the values on a usual PC monitor --> Less development effort.
Klaus
Added:
What display refresh rate do you want?
For 3 digit displays the best-fit is a 10 bit ADC.