Computer Automated Measurement and Control

Computer Automated Measurement and Control
A CAMAC module made by LeCroy.

Computer Automated Measurement And Control (CAMAC) is a standard bus for Data acquisition and control used in nuclear and particle physics experiments and in industry. The bus allows data exchange between plug-in modules (up to 24 in a single crate) and a crate controller, which then interfaces to PC or to a VME-CAMAC interface.

The standard was originally defined by the ESONE Committee[1] as standard EUR 4100 in 1972[2], and covers the mechanical, electrical and logic of a parallel bus (dataway) for the plug-in modules. Several standards have been defined for multiple crate systems including the Parallel Branch Highway definition and Serial Highway definition. Vendor specific Host/Crate interfaces have also been built.

The CAMAC standard encompasses IEEE standards:

  • 583 The base standard
  • 683 Block transfer specifications (Q-stop and Q-scan)
  • 596 Parallel Branch Highway systems
  • 595 Serial highway system
  • 726 Real-time Basic for CAMAC
  • 675 Auxiliary crate controller specification/support
  • 758 FORTRAN subroutines for CAMAC.

Within the dataway, modules are addressed by slot (Geographical addressing). The left most 22 slots are available for application modules while the right most two slots are dedicated to a crate controller. Within a slot the standard defines 16 subaddresses (0-15). A slot commanded by the controller with one of 32 function codes (0-31). Of these function codes, 0-7 are read functions and will transfer data to the controller from the addressed module, while 16-23 are write function codes which will transfer data from the controller to the module.

In addition to functions that address the module, the following global functions are defined:

  • I - Crate inhibit
  • Z - Crate zero.
  • C - Crate clear.

The original standard was capable of one 24 bit data transfer every microsecond. Later a revision to the standard was released to support short cycles which allow a transfer every 450ns. A follow on upwardly compatible standard Fast CAMAC allows the crate cycle time to be tuned to the capabilities of the modules in each slot.

The FASTBUS standard was introduced in 1984 as a replacement for CAMAC in large systems.

See also

References

External links


Wikimedia Foundation. 2010.

Игры ⚽ Поможем решить контрольную работу

Look at other dictionaries:

  • Automated Tissue Image Systems — (ATIS) are computer controlled automatic test equipment (ATE) systems classified as medical device and used as pathology laboratory tools (tissue based cancer diagnostics) to characterize a stained tissue sample embedded on a bar coded glass… …   Wikipedia

  • Computer vision — is the field concerned with automated imaging and automated computer based processing of images to extract and interpret information. It is the science and technology of machines that see. Here see means the machine is able to extract information …   Wikipedia

  • computer — computerlike, adj. /keuhm pyooh teuhr/, n. 1. Also called processor. an electronic device designed to accept data, perform prescribed mathematical and logical operations at high speed, and display the results of these operations. Cf. analog… …   Universalium

  • Computer-aided design — CAD and CADD redirect here. For other uses, see CAD (disambiguation) and CADD (disambiguation). Example 2D CAD drawing …   Wikipedia

  • measurement — /mezh euhr meuhnt/, n. 1. the act of measuring. 2. a measured dimension. 3. extent, size, etc., ascertained by measuring. 4. a system of measuring or measures: liquid measurement. [1745 55; MEASURE + MENT] * * * Association of numbers with… …   Universalium

  • Control-Feedback-Abort Loop — Too often systems fail, sometimes leading to significant loss of life, fortunes and confidence in the provider of a product or service. It was determined that a simple and useful tool was needed to help in the analysis of interactions of groups… …   Wikipedia

  • Automated optical inspection — (AOI) is an automated visual inspection of a wide range of products, such as printed circuit boards (PCBs), LCDs, transistors, automotive parts, lids and labels on product packages or agricultural products (seed corn or fruits). In case of PCB… …   Wikipedia

  • Computer security compromised by hardware failure — is a branch of computer security applied to hardware. The objective of computer security includes protection of information and property from theft, corruption, or natural disaster, while allowing the information and property to remain accessible …   Wikipedia

  • CAMAC — computer automated measurement and control …   Medical dictionary

  • CAMAC — • Computer Automated Measurement And Control …   Maritime acronyms and abbreviations

Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”