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2.4 Digital I/O
2.4.1 Digital Inputs
The Digital I/O Card has 24 digital inputs, IN00–IN23, each of which is protected over a
range of –36 V to +36 V. The inputs are factory-configured to be pulled up to +5 V, but
they can also be pulled up to DCIN or +K1 (IN00–IN15)/+K2 (IN16–IN23) or down to
0 V in banks of eight by changing a jumper as shown in Figure 9. The locations of the
headers and the jumper configurations are described in Section 2.7.2.
+5 V
DCIN
+K1/+K2
Factory
Default
27 k W
100 k W
Microprocessor
10 nF
GND
Figure 9. Digital I/O Card Digital Inputs [Pulled Up—Factory Default]
NOTE: If the inputs are pulled up to +K1/+K2, the voltage range over which the digital
inputs are protected changes to (K1/K2 – 36 V) to +36 V in order to keep the power
dissipation through the pull-up resistor below the rated 62 mW.
The actual switching threshold is approximately
2.40 V. Anything below this value is a logic 0, and
anything above is a logic 1 .
The digital inputs are each fully protected over a
+40 V
+36 V
Spikes
Normal Voltage
Levels
Spikes
range of -36 V to +36 V, and can handle short
spikes of ±40 V.
+5 V
?40 V
Spikes
Figure 10. RN1100 Digital Input
Protected Range
User ’s Manual
23
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