Grundfos CMBE 1-44 Installation And Operating Instructions Manual page 12

Terminal Type
23 GND
25 GDS TX
24 GDS RX
7 AI2
12
Function
Protective earth.
Pressure sensor: GND, 0 V. Connect the
green wire to this terminal.
Grundfos Digital Sensor output
Grundfos Digital Sensor input
External sensor.
Pressure sensor: Temperature signal, 0.5 to
3.5 V. Connect the yellow wire to this terminal.