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Chapter 1 Introduction
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National Instruments Corporation 1-5 PCI-6110E/6111E User Manual
Optional Equipment
National Instruments offers a variety of products to use with the 611
X
E
board, including cables, connector blocks, and other accessories, as
follows:
• Cables and cable assemblies
• Connector blocks, shielded and unshielded 50- and 68-pin screw
terminals
• RTSI bus cables
• Low channel-count signal conditioning modules, boards, and
accessories, including conditioning for strain gauges, RTDs,
and relays
For more specific information about these products, refer to your
National Instruments catalogue or call the office nearest you.
Custom Cabling
National Instruments offers cables and accessories for you to prototype
your application or to use if you frequently change board
interconnections.
If you want to develop your own cable, however, the following
guidelines may be useful:
• For the analog input signals, shielded twisted-pair wires for each
analog input pair yield the best results, assuming that you use
differential inputs. Tie the shield for each signal pair to the ground
reference at the source.
• Route the analog lines separately from the digital lines.
• When using a cable shield, use separate shields for the analog and
digital halves of the cable. Failure to do so results in noise coupling
into the analog signals from transient digital signals.
Mating connectors and a backshell kit for making custom 68-pin cables
are available from National Instruments.
PCI_E.book Page 5 Thursday, June 25, 1998 12:55 PM