OPERATING INSTRUCTIONS AND SPECIFICATIONS
NI 9403E
32-Channel, TTL Digital Input/Output Module
This document describes how to use the National
Instruments 9403E and includes dimensions, pin assignments, and
specifications for the NI 9403E. Visit ni.com/info and enter
rdsoftwareversion to determine which software you need for
the modules you are using. For information about installing,
configuring, and programming the system, refer to the system
documentation. Visit
ni.com/info and enter cseriesdoc for
information about C Series documentation.
Caution National Instruments makes no electromagnetic
compatibility (EMC) or CE marking compliance claims
for the NI 9403E. The end-product supplier is responsible
for conformity to any and all compliance requirements.
Caution The NI 9403E must be installed inside a suitable
enclosure prior to use. Hazardous voltages may be present.
NI 9403E Operating Instructions and Specifications 2 ni.com
NI 9403E Dimensions
The following figure shows the dimensions of the NI 9403E.
73.4 (2.89)
0.0 (0.00)
0.0 (0.00)
Figure 1. NI 9403E Dimensions in Millimeters (Inches)
© National Instruments Corp. 3 NI 9403E Operating Instructions and Specifications
26.7 (1.05)
58.4 (2.30)
66.0 (2.60)
Connecting the NI 9403E
The NI 9403E has a 37-pin DSUB connector that provides
connections for the 32 digital input/output channels.
1
DIO16
DIO17
DIO18
DIO19
DIO20
DIO21
DIO22
DIO23
COM
COM
DIO24
DIO25
DIO26
DIO27
DIO28
DIO29
DIO30
DIO31
Figure 2. NI 9403E Pin Assignments
NI 9403E Operating Instructions and Specifications 4 ni.com
DIO0
20
2
DIO1
21
3
DIO2
22
4
DIO3
23
5
DIO4
24
6
DIO5
25
7
DIO6
26
8
DIO7
27
9
COM
28
10
COM
29
11
DIO8
30
12
DIO9
31
13
DIO10
32
14
DIO11
33
15
DIO12
34
16
DIO13
35
17
DIO14
36
18
DIO15
37
19
RSVD
Each channel has a DIO pin to which you can connect a digital
input or output device. The 32 DIO channels are internally
referenced to COM, so you can use any of the four COM lines as a
reference for the external signal.
You can independently configure each DIO channel in software for
input or output. The DIO channels have Schmitt trigger inputs and
are compatible with 5 V TTL logic devices. Each input channel
has hysteresis for improved performance with noisy and
non-monotonic input signals. Each channel also has a pull-down
resistor and includes overvoltage, overcurrent, and short-circuit
protection. Refer to the Specifications section for more information
about input thresholds and overvoltage protection. Refer to the
Overcurrent/Short-Circuit Protection section for more
information about overcurrent and short-circuit protection.
© National Instruments Corp. 5 NI 9403E Operating Instructions and Specifications
Refer to Figure 3 for an illustration of several types of digital
devices connected to the NI 9403E.
DIO0 as Input
Dev 1
+5 V
Dev 2
+5 V
LED
Dev 3
Figure 3. Connecting Digital Devices to the NI 9403E
NI 9403E Operating Instructions and Specifications 6 ni.com
TTL Signal
DIO1 as Input
COM
DIO2 as Output
NI 9403E
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