Finding a direct link to the Commax DP-RA01 installation manual can sometimes be tricky because Commax often bundles documentation with the physical product or hosts it on various regional distributor portals.
Connect these to the corresponding terminals on the outdoor unit (door camera) or the master room station. commax dpra01 installation manual link
Keep the intercom wiring at least 30cm away from AC power lines to avoid "humming" or static noise in the audio. Finding a direct link to the Commax DP-RA01
Are you connecting this to a (like the DR-2K)? Is your unit battery-powered or plugged into a wall outlet ? Are you trying to link multiple room stations together? commax dpra01 installation manual link