©
National Instruments Corporation
C-1
PCI/PXI-1408 and NI-IMAQ for Win95/NT
Appendix
C
Custom Cables
This appendix lists specifications for building custom cables for your
1408 device.
Cable Specification
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 I/O Connector
section in Chapter 4, Signal Connections.
Connector specifications include:
• Video and sync signals
75
Ω
impedance
• Trigger signals
TTL
• Type
75
Ω
BNC or
25-pin DSUB receptacle
(as shown in Figure C-1)
Figure C-1. 25-Pin DSUB Receptacle
1
14
25
13