The RACK-DAC is a no frills 48 channel 1U 19" rack DMX512 to analog decoder. While inexpensively priced, it offers some outstanding features.

 Standard units  have 0 to plus 10 volt outputs.  Units with  0 to minus 10v control outputs are available by special order.  RACK-DAC's input system will receive and understand all valid flavors of DMX512 (including some illegal ones!) making it hard to fool.

The RACK-DAC supports the full range of 512 starting addresses. LED displays are provided for data and power. The unit provides soft start on initial data connection and slow fade out on data loss. All outputs are decoupled, overload and short circuit protected.
 

- http://www.goddarddesign.com