TOUCH OPERATING PANEL
ETT 1962
18.05.2017
Page 17
8
Wiring Guidelines
8.1
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.
8.2
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.
For CAN shielding is recommended.
8.3
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.
8.4
USB Interface Connections
The terminal has USB host interfaces. 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.
It should be noted that many of the USB devices on the market do not comply with
USB specifications; this can lead to device malfunctions.
This can lead to malfunc-
tion of the device.
It is also possible that these devices will not be detected at the
USB port or function correctly.
Therefore, it is recommended that every USB stick be
tested before actual use.
