In this context, by "scatter plot" we mean a plot with symbols at each data point, and no line segments connecting the data points.
The following example turns off line segments and sets symbol type 12 for curve 1 for the currently active DPlot document.
Dummy=FNDplot_send_cmd("[LineType(1,0)]")
Dummy=FNDplot_send_cmd("[SymbolType(1,12)]")
Possible result:
In the next example we turn off line segments for all curves and set symbol types for 6 curves to the first six symbol types.
Dummy=FNDplot_send_cmd("[LineType(-1,0)]")
Dummy=FNDplot_send_cmd("[SymbolType(1,1)]")
Dummy=FNDplot_send_cmd("[SymbolType(1,2)]")
Dummy=FNDplot_send_cmd("[SymbolType(1,3)]")
Dummy=FNDplot_send_cmd("[SymbolType(1,4)]")
Dummy=FNDplot_send_cmd("[SymbolType(1,5)]")
Dummy=FNDplot_send_cmd("[SymbolType(1,6)]")