Isolated data acquisition system for high voltage applications
This report describes the design and operation of a microcomputer controlled system for acquisition of both analog and binary data within the high voltage stages of a linac modulator. The system is comprised of a microprocessor Controller which communicates with the remote data Acquisition circuits via an optical bus. The bus, which uses a 1 MHz Manchester II format, is configured as a loop, starting at the Controller, daisy-chaining the remote cards and terminating back at the Controller. Upon receiving a linac timing pulse, the Controller sends addressed commands to the individual remote cards and receives data back. It then passes this data to the linac control system through a Multibus connection. Each remote circuit can return 16 binary sense and 7 (12 bit) analog parameters within 270 us. This speed is possible because of a pipelined design where one word is transmitted while another is being converted. A data conversion cycle is initiated when a remote data acquisition card receives the proper command and address from the controller.
- Research Organization:
- Fermi National Accelerator Lab., Batavia, IL (USA); Stanford Linear Accelerator Center, Menlo Park, CA (USA)
- DOE Contract Number:
- AC02-76CH03000
- OSTI ID:
- 5291472
- Report Number(s):
- FNAL-TM-1323; CONF-850504-247; ON: DE85016984
- Country of Publication:
- United States
- Language:
- English
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99 GENERAL AND MISCELLANEOUS
990200* -- Mathematics & Computers
ACCELERATORS
COMPUTERS
CYCLIC ACCELERATORS
DATA ACQUISITION SYSTEMS
ELECTRONIC CIRCUITS
FERMILAB ACCELERATOR
LINEAR ACCELERATORS
MICROELECTRONIC CIRCUITS
MICROPROCESSORS
REMOTE SENSING
SYNCHRONIZATION
SYNCHROTRONS