Bnc 725 Manuel d'utilisateur télécharger pdf (Page 18)

Logic Assignments

The logic processor assigns the combination of external inputs (in1–in8) and channel outputs

(outA–outG) that will trigger each channel. Logic assignments always appear in the following

format:

[the channel to be triggered] = [the conditions that will trigger it];

External inputs and channel outputs feed into the logic processors; therefore, they appear only on

the right side of assignments. Logic processor outputs feed the timing channel inputs inA–inH;

these terms appear only on the left side of assignments.

Here is an example:

inB = in2;

This assignment means, “Channel B will be TRUE when Input 2 goes TRUE (reaches ~ 5 V).”

The assignment:

inB = not in2;

means “Channel B will trigger when Input 2 goes FALSE (drops below 0.2 V).”

You can employ compound arguments in logical assignments, such as:

inB = not outC and in2;

This means, “Channel B will trigger when the output of Channel C is FALSE and Input 2 is

TRUE.”

This example is more complex still:

inB = (in1 or in2) and (outC or outD);

Here, Channel B requires a TRUE signal from Inputs 1 or 2, combined with a TRUE signal from

Channels C or D, in order to trigger.

NOTE: Model 725 inputs are TRUE by default if nothing is connected (i.e., the input is

normally weakly pulled high). Grounding an input switches its state to a logical FALSE.

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Bnc 725 Manuel d'utilisateur Page 18