Sensoray 2426 - Manual (Page 10)

2426 Instruction Manual 8 Encoder Interface
Termination resistors are not supplied with the module. If your
encoder (or other signal source) employs RS-422/485 drivers,
you may need to supply external terminations near the ENC
connector. Refer to your encoder documentation for the
recommended practice.
6.4.2 Interfacing TTL/CMOS Signals
To interface to TTL and 5V CMOS compatible single-ended
signals, connect only the “+” pin and leave the “-” pin
disconnected as shown in Figure 7.
Figure 7: Connecting TTL/CMOS Encoder Clocks
If you are interfacing a single-clock device (e.g., tachometer),
connect its clock output to the +A input and leave the -A and
±B inputs disconnected. If you are not using the Index signal,
leave ±Index inputs disconnected.
6.4.3 Encoder Power
The +5VOUT and GND pins may be used to power an
encoder.
The ENC connector’s GND pin must be
connected to the encoder’s power supply
return. Failure to connect these returns may
damage the 2426 module.
If your encoder (or other pulse-generating device) will be
powered from the ENC connector, wire it as shown in Figure 8:
Figure 8: Encoder powered from the 2426 ENC Connector
If your encoder is powered by an external power supply,
connect it as shown in Figure 9. Make sure the encoder’s
ground is wired to the GND pin on the ENC connector.
Figure 9: Encoder powered from an External Supply
+A
-A
2426 ENC
+B
-B
+X
-X
A
Encoder
B
X
NC
NC
NC
2426 ENC
+5VOUT
GND
VCC
GND
Encoder
Encoder
GND
VCC
GND
External
Power
2426 ENC
+ -