parallelget

#parallelget

##Syntax parallelget : int

##Description The parallelget procedure is used on a PC to read the value of certain pins on the parallel port. This port corresponds to the MS-DOS device "LPT1". This procedure can be used to control robots and peripherals.

##Example This program reads and prints the values of the five data pins of the PC's parallel port.

    const val : int := parallelget  % Read in the set of pin values
    put "Pin 10 is: ", (val div 64) mod 2
    put "Pin 11 is: ", (val div 128) mod 2
    put "Pin 12 is: ", (val div 32) mod 2
    put "Pin 13 is: ", (val div 16) mod 2
    put "Pin 15 is: ", (val div 8) mod 2

##Details The five pins that are used for parallel input are pins 10-15. The parallelget procedure returns the sum of

64 Pin 10 high 128 Pin 11 high 32 Pin 12 high 16 Pin 13 high 8 Pin 15 high

The mod and div operators can be used to determine which pins are high or low.

##See also the parallelput.html procedure.html for a diagram of the pins. That procedure.html is used to set.html the values on the parallel port.