JYTEK NuDAQ PCI-69222, User Manual

Page: 69 / 80

Operation Theory 59
The Encoder OGRx input is different from the encoder phase
input since you need to add an external +24V power to drive
the photo-couple. Figure 4-31 shows the OGRx input.
Figure 4-31: Encoder OGRx Input
CW/CCW Encoder Mode
When GPTC is set to CW/CCW encoder mode and when the
input EAx is connected to CW source signal and EBx is
connected to CCW source signal, pulses from EAx will cause
the counter to counter up and spin the motor clockwise.
Otherwise, pulses from EBx will cause the counter to counter
down and spin the motor counterclockwise. Figure 4-32 shows the
increase/decrease of counter value in CW or CCW encoder mode.
Figure 4-32: CW/CCW Encoder Timing