HPGL driver output

[irving2008]

I'd be surprised if you can. The 'z-control' on hpgl is for plotters and is pen up/pen down, the commands being:

PU (Pen Up): Executes <current pen> pen then moves to the requested position if one is specified. This position is dependent on whether absolute or relative mode is set. This command performs no motion in 3-D mode, but the outputs and feedrates are affected.
PU {x, y};

PD (Pen Down): Executes <current pen> pen then moves to the requested position if one is specified. This position is dependent on whether absolute or relative mode is set. This command performs no motion in 3-D mode, but the outputs and feedrates are affected.
PD {x, y};