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Theory of Operation
Setting the Power-Up State of the SCC-DO01
Status LED
Circuit Protection
© National Instruments Corporation
Table 1. SCC-DO01 Pin Signal Connections (Continued)
Pin Number
14
15
16
17
18
19
20
The switch for setting the power-up state of the SCC-DO01 is on the top of
the module. Switch it to High or Low depending on whether you want the
output state to be high or low on power-up. The switch does not override
the output state as determined by the E Series DAQ device.
The SCC-DO01 has a status LED that indicates when an input signal
registers a logic high or a logic low. The LED is located above the screw
terminals. If the LED is off, the input signal is registering a logic low on the
digital line.
Protection Against Spike Voltages
Two clamping diodes protect the SCC-DO01 against spike voltages caused
by inductive loads and long circuit wires. One diode is connected across
V
and V
and the other diode is connected across V
SS
OUT
11
SCC-DO01 Isolated Digital Output Module User Guide
Signal
—
—
—
—
—
—
—
and V
.
OUT
COM
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