plipconfig - phpMan

PLIPCONFIG(8) PLIPCONFIG(8)

NAME
plipconfig - fine tune PLIP device parameters

SYNOPSIS
plipconfig interface
plipconfig interface [nibble NN] [trigger NN] [unit NN]

DESCRIPTION
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 status of the
given interface only. Otherwise, it will try to set the options.

OPTIONS
nibble NN
Sets the nibble wait value in microseconds. Default is 3000.

trigger NN
Sets the trigger wait value in microseconds. Default is 500.

PLIP speed can in some cases be improved by lowering the default values. Values
which are too low may cause excess use of CPU, poor interrupt response time result-
ing in serial ports dropping characters, or in dropping of PLIP packets. Changing
the plip MTU can also affect PLIP speed.

NOTE
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.