It is frequently necessary that a DMX-compatible device or a complete DMX installation has to be tested when faults have occurred while it is in use. With the tester described here we avoid the need to have to take over the DMX master (PC or console) for this purpose. This tester can be used in every situation, thanks to its handy size and built-in rechargeable battery. And as an added benefit, this circuit can also send and receive DMX data.Anyone who has ever installed or built DMXcompatible equipment has, in all likelihood, experienced problems when it came to the operation thereof.It is impossible to describe the wide variety of possible faults and their symptoms here, because of the enormous scale of the subject! Depending on circumstances, it is possible that a simple piece of equipment (scanner, dimmer, etc.) doesn’t respond to a command, or that a complete installation has suddenly gone haywire and is carrying out programs that only it seems to be familiar with…