STP-iS2207 Series Turbomolecular Pump
MT-89E-001-C
Page 75
5
SERIAL COMMUNICATION PROTOCOL
DO NOT bundle a communication line with a protective earth conductor or a power line.
Moreover, keep away a communication line from the apparatus used as a noise source as much
as possible.
As radio frequency noise measure, place a ferrite core on both ends of the communication cable.
When electromagnetic interference caused by radio frequency noise in frequency band (150 kHz
to 1 GHz) affects communication, attaching ring ferrite cores to the cable is effective to reduce
communication failure.
Figure 39 - Example of ring ferrite core installation
Locate and secure the cables.
It may be difficult to measure the reproducibility of the communication failure without securing the
cables.
Avoid installing a power line and a communication line in the same metallic duct.
When unavoidable, separate a line with a metal separator certainly, and connect the duct
containing a metal separator certainly to GND, or installing a communication line put into
conductive pipes, such as metal.
Communication line
Metallic separator
GND
Power line
Metallic duct
Figure 40 - Example of cable installation in metallic duct
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