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Max I/O length of cables for USB-QUAD08




In the User's guide of the USB-QUAD08 Encoder Input Device, it is mentioned on the last page, that 

"I/O cables must be less than 3 meters (9.75 feet) in length."

Is it really concerning the I/O cables and not the USB cable ?

It seems in fact a short max length because, the encoders are often designed for 40m to 50m cable light using RS422 digital differential signals.

Does anyone have any experience of this?





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That sounds like the maximum length of the USB cable. The USB Specifications section on page 31 of the user manual lists 3 meters or 9.84 feet. 

If your sensor has a differential output, you could run 300 meters or more of cable, assuming it is shielded twisted pair wire. 

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