Monitors, Multi door station connection, With dbc-4s wiring mode – V-Tech DT595A Manual User Manual
Page 6: S2+(red); pl(white); s1+(yellow); s1-(black), Multi monitors connection basic in-out wiring mode, Bus(blue&green), Id=00, Code=0, dip-6=off, Code=1, dip-6=off, Dip=on,off,off