C420 Installation Manual
11
3.3.2 CPU board
The CPU board, located on the foreground inside the box, manages the control panel by communicating with the modules it is
composed of. Several connectors are placed on this board. A few of them are permanently used; other ones are available for
connecting optional modules. Below are reported the lists of connectors and jumpers available on the CPU board.
Figure 3 – CPU board
CPU board connectors
KEYBOARD
Connector used to connect the internal keyboard, located on the front panel (1)
DISPLAY
Connector used to connect the LCD display, located on the front panel (1)
MAIN
MODULE
Connector used to connect the CPU board to the Command and Control module, located on the back
of the metallic chassis (1)
EXT USB
Connector used to connect the optional module IT USB KEY for interfacing with an USB mass
storage
COM1
MODULE
Connector used to connect the optional board RS232/485 for interfacing with the printer module and
the LCD annunciator
PS2
Connector used to connect a standard PS2 keyboard
(1) Connection already in place.
CPU board JP3 jumpers
1-2
Not used
3-4
Not used
5-6
When the jumper is inserted, the auxiliary external power supply units are supervised by the control
panel.
The jumper must be inserted/removed with the control panel powered off.
7-8
Reserved – do not insert
DISPLAY
EXT
USB
MAIN
MODULE
KEYBOARD
COM1
MODULE
PS2
JP3
8
6
4
2
7
5
3
1
BATT.
BUZZER
