Beamz Pro BTS250C Manual Del Usuario página 6

If you are using a standard DMX controller, you can connect the DMX output of the controller directly to the DMX input of the first fixture in a DMX chain.
Always connect the output of one unit with the input of the next fixture until all fixtures are connected.
Caution: At the last fixture, you must close the DMX line with a terminating resistor. Take an XLR connector and solder a 120 Ohm resistor
between signal (-) and signal (+) and connect it to the DMX output of the last fixture in the line.
The BTS250C can communicate using RDM (Remote Device Management) via DMX512. RDM is a bi-directional communication protocol for use in DMX512
control systems, it is the open standard for DMX512 configuration and status monitoring.
The RDM protocol allows data packets to be inserted into a DMX512 line without affecting the existing non-RDM equipment. The system allows a controller
or special RDM controller to send and receive commands from specific fixtures.
The RDM function allows you, for example to remotely set the DMX start address of your fixtures. This is especially useful when the fixture is installed in an
inaccessible location. Each BTS250C has an RDM UID (unique identification number).
Caution: Before using the fixture, enable the RDM function via "Advanced settings" in the menu. See below picture.