Siemens SIMATIC Rack PC 840 V2 Operating Instructions Manual page 105

PS/2 keyboard port, X23
Pin assignment of the port:
PS/2, X23
USB 2.0 ports, X36
The Universal Serial Bus port has the following pinout:
USB 2.0 port
Pin No.
1
2
3
4
The connectors are of type A.
The ports are rated as high-current USB 2.0 (500 mA).
SIMATIC Rack PC 840 V2
Operating Instructions, Edition 05/2006, A5E00248055-04
Pin No. Abbreviations
1
2
3
4
5
6
Abbreviations
VCC
– Data
+ Data
GND
Meaning
DAT Data channel, keyboard Input/output
– n.c.
GND Chassis ground
P5VFK + 5 V (fused)
CLK Clock channel,
keyboard
– n.c.
Meaning
+ 5 V (fused)
Data channel
Data channel
Chassis ground
Detailed descriptions
16.1 Motherboard
Input /Output
–
–
Output
Input/output
–
Input /Output
Output
Input /Output
Input /Output
–
16-7