CM2904 Instruction Book © 2009 - 2022 Parker-Hannifin Corporation Page 44 of 51
Application Examples
Connecting rotary encoder
N
OTICE
When planning to use CM2904 for connecting quadrature encoder in motor
application (servo motor or brushless motor), ensure first the requirement from
your system point of view and take into account that quadrature mode in CM2904 is
specified up to 4kHz.
FI1
FI2
CM2904
Pulse
wheel
Signal A
Signal B
Connection
+5VOut
GND
Figure 14: Rotary encoder (pulse wheel) connection
Phase
Signal A
Signal B
1
2
3
4
1
2
3
4
1
2
3
4
1
2
3
4
Phase
Signal A
Signal B
0
0
0
1
1
0
1
1
1
2
3
4
Phase
Signal A
Signal B
0
1
0
0
1
1
0
1
Clockwise rotation
Counter- Clockwise rotation
Signals
Figure 15: Quadrature signaling and rotation direction principles.
