Normally 24V will be connected to a dc/dc converter so i can use it but for now i was just using exp-msp432p4111 board which gets power from usb and an other PCB for DAC which i shared its schematic gets 3.3V from MSP board. Also loop+ gets 24V from an other power supply. I've linked GNDs together. So i couldnt get what you mean. What will not work and what do you mean by be in series with the transmitter. Thank you for your replies.
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