3. External Connection
SMC-4DL-PCI, SMC-8DL-PCI
37
Connection with the open-collector output
Board
Driver Unit
A+
A-
AM26LS31 or
equivalence to it
Phase A+
Vcc
B+
B-
AM26LS31 or
equivalence to it
Phase B+
Vcc
Z+
Z-
AM26LS31 or
equivalence to it
Phase Z+
Vcc
Vcc
Vcc
GND
GND
Vcc
Output
(open-collector)
Vcc
Output
(open-collector)
Vcc
Output
(open-collector)
Vcc
Figure 3.12. Encoder input circuit
CAUTION
-
Do not insert a terminator when you connect TTL level output signals or open-collector output
signals. Otherwise, this product may malfunction, overheat, or cause a failure.
-
Restrict the use of cables to 10m for the line driver output, 3m for the open-collector output, and
1.5m for the TTL level output.
-
To prevent the circuit from malfunctioning due to noise, wire it as far away from other signal lines
and noise sources as possible.
