Technical data

CONTROL PANEL ETV 1961
08.07.2014 Page 15
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 VARAN bus, CAT5 cable with shielded RJ45 connectors is required. The shielding in
the CAT5 cable is connected to earth through the RJ45 connector.
Noise signals can therefore be prohibited from reaching the electronics and affecting the
function.
ESD protections
Typically, USB devices, such as the keyboard and mouse, are not wired with shielded
cables. ESD disruptions destroy theses devices, possibly rendering them irreparable.
Before any device is connected to or disconnected from the terminal, the potential should
be equalized (by touching control cabinet or earth terminal).
This will allow the dissipation of electrostatic loads (caused by clothing/shoes).
DIAS bus Termination
In a DIAS bus system, both end modules must be terminated. This is required to avoid
data transfer errors that are caused by reflections in the data lines.
The DIAS bus termination is integrated in the terminal and must no longer be built into the
DIAS bus connector.