The signals that travel from camera to PC are pretty darned important, so you’d do well to ensure they don’t get contaminated by electrical noise. For a concise introduction to the arcane subject of shielding electrical cables, read “An Update on Shielding” by Jon Titus, published in Design News November 1st, 2009.
To reinforce the message, let me share with you a note posted on the Cognex/DVT SmartList discussion board. A questioner had asked if he could make up his own cable, to which the extremely knowledgeable Ken Scofield of Cognex replied, “Cognex sells only cables that we have extensively tested for resistance to various forms of interference. We do run into very significant problems with customers using home-made cables. Long cable runs or improperly constructed cables can easily pick up induced signals that are strong enough to be mistaken as real signals, or which degrade true signals enough to drop communications.”
In other words, don’t be tempted to cut corners on cabling.
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