13
Digital Output and Input Window
The inputs could be connected to digital experiment controllers like the
LabSmith LC880, interlock switches, sensors, or other external devices,
and the outputs connected to other apparatus to facilitate real-time
control and automation.
External
Illuminator
This male nine-pin D-sub connector provides 5 V DC power and pulse
signals to drive 4 external illumination sources with settings similar to the
four-bank led module.
Pin connections
1
5 V DC (max 3 A)
2
Chassis Ground (0 V)
3
Chassis Ground
4
Chassis Ground
5
Chassis Ground
6
LED A drive (TTL)
7
LED B drive (TTL)
8
LED C drive (TTL)
9
LED D drive (TTL)
The light intensity of the SVM340 LEDs is controlled by pulse width
modulation with a frequency synchronized to the video signal. Full light
intensity means an illumination duty cycle close to 100%.
LED drive outputs A
–
D are negative logic, i.e., TTL level is high when LEDs
are off.
