BECKHOFF CP9030 - Manual (Page 6)

Beckhoff CP-Link System Description
Example: CP-Link "Single" Connection
One Control Panel with Touchpad and Touchscreen
The signals required for the touchpad (RS232) and touchscreen (RS232)
are distributed through connector ST303 to the computer's individual COM
ports. The sequence of the COM ports only has to be maintained for the
installation of the corresponding drivers. The keyboard signals are also
passed via ST303 to the motherboard's own keyboard connection.
Switching between the various keyboards (Control Panel membrane
keypad, a keyboard socket which may be present on the Control Panel, and
external keyboard connection on the PC) is performed on the CP-Link
board, which means that it is possible to operate all the keyboards in
parallel.
The BNC cables are connected to the CP-Link A and CP-Link B connectors
on the CP-Link card. Orientation is aided by a red mark on the card. The
cable types and the corresponding lengths are described below.
Fig. 3
CP9030 / CP9035 7