Printer Interface

With the aid of the printer interface ”Fieldbus” the eight inputs and outputs per card are ready for use.

"LPT Port" tab

There are three port address options. These echo the standard PC interfaces LPT1, LPT2 and LPT3. Your PC manual will tell you which LPT port on your computer corresponds to which port address. Alternatively check the current BIOS setting.

When you add the printer interface under I/O devices in the tree view, eight-bit variables are automatically created under the inputs and outputs. Note that with the inputs, the logic of the individual bits varies. Most inputs deliver a logical one if that pin is not connected to earth, and a logical zero if the pin is connected to earth. The logic is reversed in the case of those inputs indicated as inv.

A bi-directional interface is required for problem-free operation of the ”Fieldbus”.