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National Instruments Corporation
B-1
B
Custom Cables
This appendix lists specifications for building custom cables for your 1409
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 information on connector pin assignments, see the
section in Chapter 4,
Connector specifications include:
•
Video and sync signals
75
Ω
impedance
•
Trigger signals
TTL
•
Type
75
Ω
BNC or
68-pin VHDCI receptacle