CMS HCAL LED System


CMS HCAL LED system should perform the following tasks:

  1. Load a DAC for intensity control

  2. Load revolution and bunch counters for timing control

  3. Control the on/off status bit for each of two LEDs

  4. Provide readback of the DAC, counters, and status bits
This system is a non-intelligent control interface for LED functions distributed at about 150 HCAL locations. Loading and retrieving information is via a radiation tolerant fieldbus network.