FLIR AX-8 Camera

Initially after connecting to the interface of the FLIR AX-8 camera. I mainly was focused on getting the I/O working. Specifically I want to connect a microcontroller that would output a signal in order to trigger an alarm and capture an image. I started off with connecting two pins from the camera 8-pin pigtail connector. These pins specifically DIG_IN & DIG_RTN, in which the DIG_IN was connected to a single GPIO pin, and the DIG_RTN was connected to GND. After having that connected I moved forward to setting up the interface to alarm whenever a signal is detected, triggering the alarm on (1). Which would it would require a signal of 1.8V. I have tried multiple methods and nothing is working out. Was wondering as a last resort if anyone has any suggestions.