This appendix relies heavily on the LAT VME Front-End Communication (Com) Board and the LAT Communications documents mentioned in the Preface ( Background Documentation ). Please read these documents before reading this section.
This appendix specifies VME registers for the LAT COMM I/O Board when it is used as a mini-GLT for triggering and event data taking. By introducing a set of VME registers software can control the trigger sources and specify the bit fields of trigger messaged constructed by the LAT COMM I/O Board.