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MultiCam Boards Documentation > MultiCam Documentation > MultiCam Reference > Board Class > How to Work With Input/Output Lines? > Indexing the I/O Lines
Indexing the I/O Lines

All digital I/O lines belonging to a frame grabber are considered. This includes control lines delivered through the camera connectors as well.

For identifying an I/O line, a unified set of designators has been designed. These designators allow for assigning a non- ambiguous integer number to any I/O line. This process is called "indexing".

Two groups of designators are provided:

The meaning for this wording is as follows:

Direction

Meaning

Input

From outside towards grabber

Output

From grabber towards outside

A digital line that can only be used as an input will be referred to by an input designator.

A digital line that can only be used as an output will be referred to by an output designator.

A digital line that can be used as an input or an output will be referred to by two designators. The programmer uses the input or output designator according to the expected direction.

Example

Grablink Expert 2 owns a digital I/O line called IO1. When used as an input, this line is designated by IN1. When used as an output, this line is designated by OUT1.

Domino Alpha 2 owns a digital I/O line called TRZ that can only be used as an input. This line is always designated by TRZ.