Last update: 2021/04/27 20:10
safety:pass
https://wiki.pangolin.com/doku.php?id=safety:pass
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Printed on 2022/07/28 09:15
input, a simple crimp-on DB-25 connector may be used, and crimped onto the Projector-Signal-Input
ribbon cable provided with PASS.
J802: Projector-Signal-Output
The Projector-Signal-Output connector on the PASS board should be parsed out into pairs of signals, and
then directed to various components within the projector. The signals and recommended connections are
discussed below. Note that since this is an IDC connector, the pin numbers do not correspond to the ILDA
pin-out on a DB-25. HOWEVER, if you crimp a DB-25-connector onto the output ribbon cable, then the
pins will correspond directly to the ILDA pin-out. This is because the pin designations of a DB-connector
are “in-line” while the pin designations of an IDC connector are “even and odd”.
Pins 1 and 2 correspond to the X+ and X- signal respectively. These should be connected to the
X+ and X- input on the X-axis scanner amplifier.
Pins 3 and 4 correspond to the Y+ and Y- signals respectively. These should be connected to the
Y+ and Y- input on the Y-axis scanner amplifier.
Note: There should NOT be a connection to the “signal ground” of any scanner amplifier. The only
“ground” connection to the scanner amplifier (or amplifiers) should be from the power supply itself.
Connecting to the “signal ground” on a scanner amplifier will introduce a ground loop, which may cause
distorted images. See the “Power and X-Y Position Signal Connections” on the following pages.
Pins 5 and 6 correspond to the Intensity/B and Intensity/Blanking – signals respectively.
These may be used for a single-color projector or projectors that use a PCAOM for color.
Pins 7 and 8 correspond to the Projector Interlock loop pins 4 and 17 from the ILDA connector.
Note that PASS will interrupt this interlock signal loop in the event of a critical fault and
when power is insufficient, therefore it is MANDATORY that projector manufacturers
implement an interlock scheme that makes use of these signals. Ideally this interlock loop
should interrupt power to the lasers themselves, thus, in the event of a major problem, PASS can
interrupt power to the lasers. Alternatively the interlock loop may be routed to a SEPARATE shutter
placed just before the X-Y scanners and after the PASS light sensor.
Pins 9 and 10 correspond to Red+ and Red – color signals respectively. These should be
connected to the RED input on a PCAOM driver or directly to a laser diode driver.
Pins 11 and 12 correspond to Green+ and Green – color signals respectively. These should be
connected to the GREEN input on a PCAOM driver or directly to a laser diode driver.
Pins 13 and 14 correspond to Blue+ and Blue – color signals respectively. These should be
connected to the BLUE input on a PCAOM driver or directly to a laser diode driver.
Pins 15 and 16 correspond to Deep Blue+ and Deep Blue – color signals respectively. These are
most often not used by modern RGB laser projectors and thus, can be left unconnected. If they are
used, they should be connected to the DEEP BLUE input on a PCAOM driver or directly to a laser
diode driver.
Pins 17 and 18 correspond to and Yellow – color signals respectively. These are most
often not used by modern RGB laser projectors and thus, can be left unconnected. If they are used,
they should be connected to the YELLOW input on a PCAOM driver or directly to a laser diode
driver.
Pins 19 and 20 correspond to Cyan+ and Cyan – color signals respectively. These are most often
not used by modern RGB laser projectors and thus, can be left unconnected. If they are used, they