I think you are correct. Text emissions have some sort of code which indicates the character to be transmitted. Such codes are Morse, Baudot, ASCII, and Varicode to name a few. Digital facsimile is pixilated and the pixel's intensity is represented numerically as in bitmap images. Pixels are simple black or white with simple images modes like Hellscrieber. Analog facsimile is most commonly a tone frequency which represents the intensity of a line drawn horizontally with respect to the image. Data when it is not telemetry or telecommand is anything else that is not text or image.
73, Mark N5RFX >Since it can be transmitted in either analog or digital form with almost >any kind of modulation and there are no encoding restrictions, a fax >seems to be any printable document -- even if it isn't printed immediately.
