|LP_PBUSY||inverted busy input, active high|
|LP_PACK||unchanged acknowledge input, active low|
|LP_POUTPA||unchanged out-of-paper input, active high|
|LP_PSELECD||unchanged selected input, active high|
|LP_PERRORP||unchanged error input, active low|
Refer to your printer manual for the meaning of the signals. Note that undocumented bits may also be set, depending on your printer.