In order to force the coordinates of the lower left and upper right corners of the plot, use the ManualScale macro command. By default, DPlot automatically scales the plot.
Examples:
! manual scale of the X and Y axis (X=0..10, Y=-1..1)
Dummy=FNDplot_send_cmd("[ManualScale(0,-1,10,1)]")
! manual scale of the Y axis only
Dummy=FNDplot_send_cmd("[ManualScale(,-1.2,,1.2)]")