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NAME

TDC - Risoe TDC

DESCRIPTION

The Risoe Time-to-Digital Converter (TDC) P2011a/P2012a processes events from the Risoe 2D multiwire small angle neutron scattering detector. spec supports the TDC over a GPIB interface.

The controller is selected in the config file with the line

GP_RISOTDC = gpib_address  @img_sel

where sel is the image-device number used as the first argument in the image_par() and image_get() functions below. When running the configuration editor, switch to the MCA- and CCD-like device configuration screen to select the Risoe TDC as a CCD-like device.

The size of the 2D data array sent by the TDC is 128x128. The native data type is unsigned long.

FUNCTIONS

The image_par() function controls the TDC behavior as follows:

image_par(sel, "clear"): Clears the TDC memory.
image_par(sel, "run"): Start data collection. Memory is not cleared.
image_par(sel, "halt"): Halt data collection.
image_par(sel, "XYmode"): Set 2D mode, 128x128 pixels. This is the default mode.
image_par(sel, "Xmode"): Se data collection to 1D mode along the horizontal direction.
image_par(sel, "Ymode"): Se data collection to 1D mode along the vertical direction.
image_par(sel, "map", num): Set the map number as described in the TDC manual. The default value for num is zero, which is appropriate for 2D data collection. For 1D data collection, a value of 2 is recommended.
image_get(sel, arr): Reads data into the array arr.

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