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PASS
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indicates that the beam velocity is OK, and that PASS will not actively suppress laser output
because of velocity (PASS may suppress laser output for other reasons however). If this signal is
HIGH (approximately 4 volts), it indicates that the beam velocity is too slow, and that PASS will
actively suppress laser output. This signal may be routed through a resistor to an LED or pair of
LEDs (bi-color pair) to give an indication on the control panel as to the disposition of the velocity.
Pin 15 is an output, which corresponds to the light detector within PASS. If this signal is LOW, it
indicates that the light that is detected by PASS is above the “Maximum Safe Laser Power”
threshold setting. If this signal is HIGH (approximately 4 volts), it indicates that the light detected is
below the “Maximum Safe Laser Power” threshold setting. Under ordinary circumstances, this will
never be LOW. This signal may be routed through a resistor to an LED or pair of LEDs (bi-color pair)
to give an indication on the control panel as to the disposition of the light detected by the light
sensor.
Pin 17 is an output, which corresponds to whether or not PASS is “ready”. Once PASS has given a
“armed” indication on Pin 19, and then once the “Manual Reset” is activated (by connecting Pin 3
to Pin 4), this signal will go HIGH, indicating that PASS will allow color signals to flow through the
PASS board to the internal laser projector components. This signal will remain HIGH as long as
there are no major faults detected, such as a Power Supply fault, Light Detector fault, other
detectable major fault, or ESTOP being activated. This signal may be routed through a resistor to
an LED or pair of LEDs (bi-color pair) to give an indication on the control panel as to whether or not
PASS is active.
Pin 19 is an output, which corresponds to whether or not PASS is ready to be activated (“armed”).
If this signal is HIGH, it indicates that the power supply is OK, ESTOP is not activated, and light is
not detected and thus, PASS may be activated by performing a “Manual Reset”. This signal may be
routed through a resistor to an LED or pair of LEDs (bi-color pair) to give an indication on the
control panel as to whether or not a Manual Reset can be performed. If used, this LED should
ideally be placed near the “Manual Reset” push button or keyswitch.
Pin 12 is an output, which corresponds to whether or not the computer feeding the ILDA input has
commanded that light come out of the laser projector or not. If this signal is HIGH, it indicates that
the light that PASS has detected that the computer has requested more than approximately 50%
beam power from the computer. If this signal is LOW, it indicates that the computer is commanding
50% or less beam power from the computer. This signal may be routed through a resistor to an
LED or pair of LEDs (bi-color pair) to give an indication on the control panel as to whether or not the
computer has commanded light to come out of the projector.
Pin 14 is an output, which corresponds to the condition of the power supply, both within PASS and
supplying the scanner amplifiers. If this signal is HIGH, it indicates that the power supply feeding
the scanner amplifiers is 19 volts or higher. It also indicates that all of the power supplies within
PASS itself are also within their acceptable ranges. If this signal is LOW, it indicates that there is a
power supply problem of some kind. This signal may be routed through a resistor to an LED or pair
of LEDs (bi- color pair) to give an indication of the state of the power supplies.
Status LED signals on the Control Panel connector
Pin 16 is a “Status LED number 1”. If this signal is LOW, it indicates that a power supply fault has
been detected.
Pin 18 is a “Status LED number 2”. If this signal is LOW, it indicates that the PASS light sensor
detected a light level that exceeded the “Maximum Safe Light Level” while the Y position was
below the horizon.