SIGMATEK ETT 775, Руководство по эксплуатации

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BUILD-IN TOUCH TERMINAL ETT 775
15.07.2020 Page 21
7 Wiring Guidelines
7.1 Ground
The terminal must be connected to ground via 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 must be made with the
maximum cross section and 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 ground terminal). Electrostatic loads
(through clothing and shoes) can thereby be dissipated.
7.4 USB Interface Connections
The terminal has a USB interface. In LASAL, this interface can be used for various USB
devices (keyboard, mouse, storage media, hubs, etc.). Using a hub, several USB devices
can be connected that are then fully functional in LASAL.