Hello.
I am trying to transmit temperature and humidity through 3 wires, +LOOP, -LOOP_temperature, and -LOOP_Humidity.
Individually, they work perfectly, but when I connect them in parallel, they don't work. The current outputs are regulated:
For example, if I want 9mA to flow through the temperature loop and 16mA through the humidity loop, the result is that I have two equal currents of 16mA.
It always equalizes more or less to the higher output.
I have attached my schematic.
Is it impossible to use 2 DAC161S997 with the same LOOP+ and the same ground? How should I connect them to make them work correctly?
Regards.