Multiple controllers in a CAMAC crate

Technical Report · Wed Mar 01 00:00:00 EST 1978

DOI:https://doi.org/10.2172/6690499· OSTI ID:6690499

Provision for the use of auxiliary controllers in a CAMAC crate is made to extend the capabilities and fields of application of the CAMAC modular instrumentation and interface system of IEEE Standard 583-1975 (EUR 4100e). The ESONE document corresponding to this report document is EUR 6500e. Auxiliary controllers, located in several crates on a CAMAC Command Highway (Parallel Branch or Serial), can provide the user with an extremely effective distributed processing capability. This capability is useful in both data acquisition and automatic control systems where parallel processing is desirable. Auxiliary controllers can be of various degrees of sophistication, and some may include processor elements for increased autonomy from central computers. A further extension of the AC-based CAMAC system may include a special communication channel direct from an AC to another element in the system. High-speed block transfer of data can be effected to and from the AC in such a case. To permit use of the auxiliary controllers in CAMAC crates, the hardware and protocol are defined so as to: (1) provide means for granting control of the Dataway to auxiliary controllers that request control and to provide a priority selection scheme to arbitrate in the case of simultaneous requests from multiple controllers; and (2) provide means for the auxiliary controller to address (a) the dedicated module address lines and (b) the dedicated interrupt request LAM (Look-at-Me) lines, all of which terminate only at the crate controller station and at the module stations to which they are dedicated.

• Research Organization: National Instrumentation Methods Committee (USA); European Standards on Nuclear Electronics (ESONE) Committee of European Labs.
• Sponsoring Organization: USDOE
• OSTI ID: 6690499
• Report Number(s): DOE/EV-0007
• Country of Publication: United States
• Language: English

Related Subjects

47 OTHER INSTRUMENTATION
99 GENERAL AND MISCELLANEOUS//MATHEMATICS, COMPUTING, AND INFORMATION SCIENCE
CAMAC SYSTEM
STANDARDS
CONTROL SYSTEMS
AUTOMATION
AUXILIARY SYSTEMS
COMPUTERS
DATA ACQUISITION SYSTEMS
DATA PROCESSING
DATA TRANSMISSION
EQUIPMENT INTERFACES
SPECIFICATIONS
COMMUNICATIONS
PROCESSING
440300* - Miscellaneous Instruments- (-1989)
990200 - Mathematics & Computers