SIGMATEK ETT 731, Техническое руководство

Страница: 21 / 36

BUILD-IN TERMINAL TOUCH ETT 731
05.12.2019 Page 19
7 Wiring Guidelines
7.1 Ground
The terminal must be connected to ground through the assembly on the control cabinet or
over the connection provided. It is important to create a low-ohm ground connection, only
then can error-free operation be guaranteed. The ground connection should have a maxi-
mum cross section and the largest (electrical) surface possible.
7.2 Shielding
For the Ethernet, CAT5 cables with shielded RJ45 connectors must be used. The shielding
on the CAT5 cable is connected to ground over the RJ45 plug connector. Noise signals can
therefore be prevented from reaching the electronics and affecting the function.
7.3 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 the control cabinet or earth terminal). This will allow the dissipa-
tion of electrostatic loads (caused by clothing/shoes).
7.4 USB Interface Connections
The terminal has a USB interface. The terminal has a USB interface connection that can be
used to connect various USB devices (keyboard, mouse, storage media, hubs, etc.) in
LASAL. Using a hub, several USB devices can be connected that are then fully functional in
LASAL.