User`s manual

34 • Part I: PC2-CamLink Board PC2-CamLink User's Manual
TTL Shaft Encoder to LVDS/RS422 Input Block Diagram
LDVS (+) input
LDVS (-) input
FG/system GND
DC
+1 to +2
volts
TTL signal source
GND
Frame Grabber System
Connecting TTL Signals to LDVS Inputs
• LVDS/RS422 (-) input is biased to a DC voltage from +1 to +2 volts.
• This guarantees that the TTL signal connected to the LVDS/RS422 (+) input will be detected as a
logic high or low relative to the (-) input.
• The TTL shaft encoder ground, the bias voltage ground, and the PC2-CamLink computer system
ground must be connected together.
LVDS/RS422 (-) Input Bias Source Generation
330
220
+5V
+2V
680
100
+12V
+1.5V
+1.5V
Battery
3 Examples on Generating a DC voltage for the LDVS (-) Input
• DC voltage for the LVDS/RS422 (-) input can be generated by a resister voltage divider.
• Use a single battery cell if more suitable for your system.
• A DC voltage (either +5 or +12) is available on DB-15 connector (J2).