Printronix ThermaLine Series Programmer's Reference Manual page 114

Example The following program specifies 4 vertical lines. To illustrate positioning,
the starting row and column are indicated on the example but do not
necessarily reflect actual location on the page.
VERT
2;36;53;61
2;50;53;61
2;60;53;61
2;70;53;61
STOP
COLUMN 36
NOTE: If the SCALE; DOT command is used to specify the dot resolution,
4–70
COLUMN 50
ROW 53
ROW 61
the line thickness will be specified in that scale.
vert.ex
Commands