Conversion Factor Variables

The $PCONFC Variable

$\textbf{{\char36}PCONFC}$

Primary to secondary machine units conversion

Type: Numeric, Read/Write

The $PCONFC variable is used to indicate whether primary or secondary machine units are in effect. If primary units are in effect $PCONFC will be 1 (one). Any other value indicates that secondary units are in effect and the secondary dimensional register formats will be used. The $PCONFC for secondary units is defined as the number of secondary units per primary unit. For example, if the primary units were inches and the secondary units were millimeters then the $PCONFC for the secondary units would be 25.4.

Note that the $PCONFC can be defined to override the secondary units specified in the general information section of the questionnaire.

The $UNIMCH Variable

The $UNIPRI Variable

The $UNISEC Variable

The $UNITS Variable

$\textbf{{\char36}UNIMCH}$	Current machine units Type: Numeric, Read/Write
$\textbf{{\char36}UNIPRI}$	Primary machine units Type: Numeric, Read-only
$\textbf{{\char36}UNISEC}$	Secondary machine units Type: Numeric, Read-only
$\textbf{{\char36}UNITS}$	Current machine units Type: Numeric, Read-only

These unit variables simplify coding of macros with control emulators that deal with both imperial and metric units. The units are expressed in units-per-inch, meaning that a value of 1 represents inches and a value of 25.4 represents millimeters.

The $UNIPRI variable defines the primary measurement units used in QUEST for all control emulator dimensional values. The $UNISEC variable defines the secondary unit system supported by the control emulator if there is one, or will have the same value as the primary units if the control emulator supports a single units system only. The $UNITS variable indicates the current units of dimensional values read from the MCD.

$UNIMCH can be set at any time to change the input units (i.e., those of the MCD).