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ETV 1991
CONTROL PANEL
Page 16
21.06.2018
Shielding
For the CAN and DIAS bus wiring, twisted pair shielded wires should be used. The cable
shielding must be connected to earth either directly before the terminal over a large sur-
face and with low Ohms using grounding clamps or with a blade terminal. With Ethernet
and the VARAN bus, CAT5 cables with shielded RJ45 connectors are required. The
shielding in the CAT5 cable is connected to earth through the RJ45 connector.
Noise therefore cannot reach the electronics and affect the function.
ESD Protection
Typically, USB devices (keyboard, mouse) are not equipped with shielded cables. These
devices are disrupted by ESD and in some instances, no longer function.
Before any device is connected to or disconnected from the terminal, the potential should
be equalized (by touching control cabinet or earth terminal). Electrostatic loads (through
clothing and shoes) can thereby be dissipated.
DIAS Bus Termination
In a DIAS bus system, both end modules must be terminated. This is necessary to avoid
transmission errors caused by reflections in the line.
The DIAS bus termination is integrated in the terminal and must no longer be built into the
DIAS bus connector.