This Arduino add-on allows you to use the Arduino as a DMX master device (transmitter). This board is a simple circuit based around a driver chip (MAX-485 or SN 75176) with an XLR 3 pin male DMX output connector. Pin1 = Signal Common, Pin2 = Data-, Pin3 = Data+. The board converts the Arduino signal voltage according to DMX (RS485). Impedance is 100 Ohm.
Specifications:

1. working voltage: 5 V
2. DMX connection: XLR 3 pin
3. dimensions: 40 x 20 x 30 mm
4. weight: 10 g

sn75176a_datasheet.pdf

vma432_a4v01.pdf

ce_rohs_open.pdf