Microscan NL-200, User Manual

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NL-200 Series Controller User’s Manual
6-1
6 General Description
The NL-200 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-200 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-200 is set up using the push buttons and display on the front of the unit. The set up is non-
volatile, so the NL-200 will resume the same operation after a power cycle.
6.1 Output Modes
The trigger inputs are used as follows:
Mode Trigger Input Output
Continuous Unused Output is on.
Switched Trigger = off Output is off
Trigger = on Output is on
Selected Trigger = off Output is continuous brightness 2
Trigger = on Output is continuous brightness 1
Pulsed Trigger rising edge Pulse is triggered if P flag = 1
Trigger falling edge Pulse is triggered if P flag = 0
Note that the P flag inverts the sense of the trigger input.