The xThr register class is used for writing the sumbus threshold registers on the VXI Master Trigger modules.
This is a 16 bit digital write only register which handles conversion between threshold multiplicity and hardware register value via a lookup table.

Attributes :-

-s    VXI slot number

specifies the slot number (1-12) within the VXI crate. Manditory - no default value.

-o    offset

specifies the address offset of the hardware register relative to the base of the VXI card. Manditory - no default value.

-r    table

specifies the calibration information to be used when converting data between real (physical) units and digital (electronics) units.
The attribute format is for example
-t6,17,28,40,51,64,75,86,99,110,122,133,145,156,167,178,189,200,211,222,233,244,255
The maximum digital value permitted is 255.
A real value of n uses the (n-1)th element in the table. Thus n=7 would be converted into 75 to be written to the hardware.

-i    initial value

specifies the data value in real units to be used by the INITIALISE operation.

The WRITE operation will accept a value in "real" units (i.e. the required threshold multiplicity) which is first converted to digital units using the lookup table before being written to the hardware. It will also accept a value in digital units in the form 0xnn which is written directly to the hardware.
The READ operation will always return a value converted into "real" units.