Width/Offset Word:  The second setup line (I-variable) of a parallel read entry contains the width of the data to be read, and the location of the LSB.

This 24-bit value, usually represented as 6 hexadecimal digits, is split evenly into two halves, each of 3 hex digits.

The first half represents the width of the parallel data in bits, and can range from $001 (1 bit wide – not of much practical use) to $018 (24 bits wide).

The second half of the line contains the bit location of the LSB of the data in the source word, and can range from $000 (Bit 0 of the Y-word at the source address is the LSB), through $017 (Bit 23 of the Y-word at the source address)

Maximum Change Word:  If the method character for a parallel read is $3 or $7, specifying filtered parallel read, there is a third setup line (I-variable) for the entry.  This third line contains the maximum change in the source data in a single cycle that will be reflected in the processed result, expressed in LSBs per servo cycle.

The filtering that this creates provides an important protection against noise and misreading of data.  This number is effectively a velocity value, and should be set slightly greater than the maximum true velocity ever expected.