The first two pictures shows the set-up of our power supply. As you can see from the picture, the voltage we are giving is +/- 19V.

The third picture shows the connection of the cable to the voltage supply. The connection follows the content of labels.

Finally, as pointed by Henning, I checked the voltage between pin 1, pin 5 and pin 3. These are shown in the attached picture 4 and 5. The voltage between pin 1 and 3 is 19V. While the voltage between pin 5 and 3 is -19V.

This result means the voltage going to homodyne should be fine.