3. External Connection
36
SMC-4DL-PCI, SMC-8DL-PCI
Connection with the TTL level 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
TTL level
output
Vcc
TTL level
output
Vcc
TTL level
output
Vcc
Figure 3.11. Encoder input circuit