Originally, and still, a brand name for a handheld DMX generator used for testing: Lil' DMXter, by Goddard Designs. Often used generically when referring to any DMX test device, such as GamCommand, Micro-Scope, Gizmo, and MicroTech DMX, and many others.
To test just for the presence of signal, this may be purchased, or visit http://www.bigclive.com/dmxtest.htm for instructions on building one's own.
To test just for the presence of signal, this may be purchased, or visit http://www.bigclive.com/dmxtest.htm for instructions on building one's own.