True - it is not designed for 2 way parallel port communication - it just captures the data sent to a parallel port and emulates an old printer (Epson ESC/P, ES

True - it is not designed for 2 way parallel port communication - it just captures the data sent to a parallel port and emulates an old printer (Epson ESC/P, ESC/P2, HP PCL, PostScript, Printronix, Tandy, IBM ProPrinter) - converting the output to PDF which can then be printed or stored. It was quite a bit later in the history of the printer, when equipment started to expect 2-way communication with printers - obtaining information about the model, ink levels, paper status etc - generally that type of equipment had printer drivers for each model of printer. We would have liked to implement something along those lines, but there is very little information (if any) about the status messages passed from the printer back to the equipment (it is not covered in the ESC/P2 documentation for example as that was last updated in 1990).