38 Appendix B. Laser head board
B.3 Headboard connection to controller
Note TheMOGLabs lasercableisadigitalDVI-DDL(dual link)cable. There
isabewilderingassortment ofapparentlysimilarcablesavailable. Most
computer display DVIcableswillnot workbecausetheyaremissingimpor-
tantpins;seediagrambelow. Onlyhighqualitydigitaldual-link DVI-D
DLcables should be used.
Pin Signal Pin Signal Pin Signal
1 TEC – 9 DIODE – 17 DISC +
2 TEC + 10 DIODE + 18 DISC –
3 Shield 11 Shield 19 Shield
4 TEC – 12 DIODE – 20 STACK +
5 TEC + 13 DIODE + 21 STACK –
6 T
sense
− 14 Relay GND 22
7 T
sense
+ 15 +5V in 23 NTC –
8 16 Interlock out 24 NTC +
1 8
17 24
18
1724
LASER Socket: DVI-D DL (Dual Link) Plug: DVI-D SL (Single Link)
Do not use SL cables
Missing pins
Figure B.4: Headboardconnector.Notethatthepinoutisdifferenttothatof the
matching connector on the rear of the DLC controller.
A10kthermistorshouldbeconnectedtoNTC+andNTC–,butanAD590
or AD592temperature sensorcan beinstead beconnectedto T
sense
. Pin
15shouldbeconnectedtoa+5Vsupply. Toactivatethelaserdiode,
relay GND (pin 14) should be grounded to open the relay that otherwise
short-circuits the diode current. +5V (pin 15) is internally connected
topin16(Interlock),normallywithapermanentconnectionbutonsome
headboards (seeabove),aconnector isprovidedtoallow connectiontoa
cover-activatedmicroswitchtodisablethelaserwhenthecoverisremoved.
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