Figure 14. Connecting Single-Ended Line Drivers
Diff In 0+
Diff In 0–
Phase A
Twisted Pair
Twisted Pair
Diff In 1+
Diff In 1–
Phase B
External Device
Industrial Controller
+
–
+
–
TTL I/O
The following image shows the circuit for a bidirectional TTL I/O.
Figure 15. TTL Input/Output Circuit
100
Ω
TTL_OUT
TTL_OE
TTL_IN
10 k
Ω
FB
TTL I/O
LED Indicators
The IC-3121 provides the following LED indicators.
14
|
ni.com
|
IC-3121 User Manual
