JVL MIS17 Series User Manual page 36

2.7
As an alternative, a connector with a short cable can be used with the resistor soldered
between the two wires carrying A- and B+.
Use individually shielded cables.
In some installations, it will be necessary to have RS-485 signals in the same multi-wire
cables as fast-switching digital signals. In addition to keeping cable lengths to a minimum
and using termination resistors, high-quality cables, where each wire is shielded from the
other wires in the cable, should be used. This is typically done using a metal foil wrapped
around each wire. These types of cables are more expensive, but the overall cost and
noise immunity requirements may justify the solution instead of splitting cables.
2.7.6 Use simple shielding
Using cables with only a single shield shared by all the signal wires will also improve noise
problems to some degree, but will not guarantee completely stable operation for mixed
signal cables. If a cable carries only RS-485 or only digital I/O, this simple and inexpensive
form of shielding is recommended.
36 JVL Industri Elektronik A/S - User Manual - Integrated Stepper Motors MIS17x, 23x, 34x, 43x
EMC considerations