Digital radiography system and device for an X-ray system are provided. The digital radiography system includes: an X-ray detector that receives X-rays radiated from a generator of an X-ray system and that forms an X-ray image； a camera that captures an image of one side surface of a controller outputting a ready signal and a shot signal to control operation of the generator； and a monitoring device that analyzes image information transmitted from the camera to recognize a control signal output from the controller to the generator and that provides information on the control signal to the X-ray detector. By acquiring a control signal of the generator using an external image of the controller using the camera, it is not necessary to connect a cable for allowing the monitoring device and the X-ray detector to directly receive the control signal from the controller and thus to improve convenience of installation.
