Use the J1 connector pin 13 and 14 on the rear panel.
The release voltage across pin 13 and 14 is approx. 5 V maximum, and the short circuit current is approx. 500 µA maximum.
To set the external control logic of the output on/off, go to the CONFIG setting (CF22).
If you choose H on CF22, and the pin 13 and 14 are open, the output turns on.
If you choose L on CF22, and the pin 13 and 14 are short-circuited, the output turns on.