How should the shielding of the concentrator's communication cable be handled?

The shielding of concentrator communication cables (RS485, CAN, Ethernet, etc.) is crucial for ensuring communication quality. The basic principle is that the shielding layer must be reliably grounded at the concentrator device end, with the grounding point being the chassis ground (PE). The connection method must be 360° crimping; pigtail connection is strictly prohibited. At the remote device end, the grounding depends on the system's grounding: if the remote device is well grounded and has a small potential difference with the concentrator ground, the shielding layer should also be grounded at the remote end (grounded at both ends); otherwise, it should be floating at the remote end (grounded at one end). In environments with severe high-frequency interference, even with grounding at both ends, it is recommended to connect a ferrite core (PBZ1608E600Z0T) in series in the shielding layer to suppress low-frequency circulating currents. The shielding layer should enter the concentrator along with the communication signal line and immediately pass through filtering and protection circuitry at the entry point. The cable itself should be shielded twisted-pair cable. With proper handling, the communication cable can resist external interference and reduce its own radiation.