Advantech PCI-1241, User Manual

Page: 77 / 104

67 Appendix A
A.4 Encoder Input:
Input Pulse for
Encoder
Interface Input
5 channels
Encoder Pulse
Input Type
Quadrature (A/B phase) or Up/Down
Counts per
Encoder Cycle
X0, x1, x2, x4 (A/B phase only)
Interface
Differential with Photo Coupler
Max. Input
Frequency
2 MHz
Input Voltage Single Ended
Configuration
Logic High : CH- >
3V CH+ = 0V(GND)
Logic Low : CH- <
0.8V CH+ =
0V(GND)
CH- Max. input
voltage: +12V
Differential
Configuration
CH+ - CH- > 3V
is positive
3V > CH+ - CH- >
-3V is unknown
CH+ - CH- < -3V
is negative
CH+/CH- Max. input
voltage: +/-12V
Protection
2,500 VDC isolation