Hi
You don't say how you are testing or when.
The parallel port is in an unknown state until Linuxcnc has loaded the parport driver and started.
The output pins will emit TTL signals, below 0.8v is OFF and 2.4 - 4.8v is ON
The inputs can sink ~5V to 25mA and use the same input TTL convention as above
What you need to do is start your configuration and the open Machine > Show Hal Configuration > pins > partport.0 (parport.1 etc)
Then check that the right pins are present and watch the pins when you apply a signal to them or send a signal from them
You can use JT's parallel port tester
www.linuxcnc.org/index.php/english/compo...iew&catid=18&id=4743
or
just attach a buffered BoB and ground the input pins and watch the Hal Configuration display
Remember that an opto isolated BoB will invert the logic on inputs, so you may need to use the
-not suffix on your net assignments
regards
