plipconfig - fine tune PLIP device parameters
plipconfig interface [nibble NN] [trigger NN] [unit NN]
Plipconfig is used to (hopefully) improve PLIP performance by changing
the default timing parameters used by the PLIP protocol. Results are
dependent on the parallel port hardware, cable, and the CPU speed of
each machine on each end of the PLIP link.
If the single interface argument is given, plipconfig displays the sta
tus of the given interface only. Otherwise, it will try to set the
Sets the nibble wait value in microseconds. Default is 3000.
Sets the trigger wait value in microseconds. Default is 500.
PLIP speed can in some cases be improved by lowering the default val
ues. Values which are too low may cause excess use of CPU, poor inter
rupt response time resulting in serial ports dropping characters, or in
dropping of PLIP packets. Changing the plip MTU can also affect PLIP
If you get no response it is far more likely the irq is wrong and needs
setting with ifconfig. The few cases where the default parameters will
be too fast are those using very long cables. Something you should
never do as the parallel port is not specified or designed for driving
long cable runs.
John Paul Morrison, ,
17 February 1995 PLIPCONFIG(8)