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I would like to connect a two-wire transmitter to the JUMO cTRON. Is this possible without an additional power supply?

It is possible to use the 0/14V logic output for this purpose. You can use the setup program to invert the output that has been switched off. This sets the logic output permanently. This function can be implemented with a limit comparator, for example, without the setup program.

P2_4_Q5_DE

Before using the logic output for the transmitter supply voltage, you must check whether the available voltage of about 14V is sufficient for the transmitter power supply and the voltage drop via the cable and the measurement inputs.