Custom Cables; 25-Pin Dsub Receptacle - National Instruments IMAQ PCI-1408 User Manual

Custom Cables

Cable Specification
© National Instruments Corporation
This appendix lists specifications for building custom cables for your 1408
device.
National Instruments offers cables and accessories for you to connect to
video sources, trigger sources, or synchronization sources. However, if you
want to develop your own cables, the following guidelines must be met:
For the video inputs, use a 75 Ω shielded coaxial cable.
•
• For the digital triggers and synchronization signals, twisted pairs
for each signal yield the best result.
• For the 25-pin DSUB connector, use AMP part number 747912-2
or equivalent.
For information on connector pin assignments, see the
section in Chapter 4, Signal
Connector specifications include:
• Video and sync signals
• Trigger signals
• Type
13
Figure B-1. 25-Pin DSUB Receptacle
Connections.
75 Ω impedance
TTL
75 Ω BNC or

25-pin DSUB receptacle

(as shown in Figure B-1)
25
B-1
B
I/O Connector
1
14
IMAQ PCI/PXI-1408 User Manual