[http://www.ligo.caltech.edu/~cit40m/Docs/DCdetect/DC_Detect_wiring.pdf DC readout wiring schematic]
[http://www.ligo.caltech.edu/~cit40m/Docs/DCdetect/DCPD_schematic.pdf DC photodetector schematic (Rich)]
[http://www.ligo.caltech.edu/~cit40m/Docs/DCdetect/T060031.pdf LASTI Digital Control and Data System Design (Rolf)]