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6 General Description
The NL-2XX current controller provides repeatable intensity control of LED lighting for machine vision
applications. It includes the intensity control, timing and triggering functions required for machine vi-
sion systems.
LED lighting needs a constant current supply as small variations in voltage can cause large variations
in light output. The NL-2XX can set currents in steps of 0.1% (with a lower limit of 2.5mA steps) to
give very fine control of intensity.
Four modes of operation are provided separately for each channel:
•
Continuous ("SCo"):
In continuous mode the output is a continuous brightness.
•
Pulse (Strobe) (SPu"):
In pulse mode output is pulsed once per trigger. One trigger input is used as a trigger. The delay
from trigger to pulse, the pulse duration and the brightness can be set.
•
Switched ("SOn"):
In switched mode a trigger input can be used to switch the output current on and off. The output
is only enabled when the trigger input has a voltage on it.
•
Selected ("SSe"):
In selected mode a trigger input can be used to select between two different intensities..
The NL-2XX is set up using the push buttons and display on the front of the unit. The set up is non-
volatile, so the NL-2XX will resume the same operation after a power cycle.
6.1 Output Modes
The trigger inputs are used as follows:
Mode
Continuous
Switched
Selected
Pulsed
Note that the P flag inverts the sense of the trigger input.
NL-200 Series Controller User Manual
Trigger Input
Unused
Trigger = off
Trigger = on
Trigger = off
Trigger = on
Trigger rising edge
Trigger falling edge
Output
Output is on.
Output is off
Output is on
Output is continuous brightness 2
Output is continuous brightness 1
Pulse is triggered if P flag = 1
Pulse is triggered if P flag = 0
6-1
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