Siemens SIMATIC Rack PC 840 V2 Operating Instructions Manual page 104

Detailed descriptions
16.1 Motherboard
LPT1 parallel port, X134
The parallel port (LPT 1) has the following pinout:
Parallel port LPT1
PinNo.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18 – 25 GND
PS/2 mouse port, X22
Pin assignment of the port:
PS/2, X22
16-6
Abbreviations Meaning
/ Strobe (CLK) Data message
Data - Bit 0 Data channel 0
Data - Bit 1 Data channel 1
Data - Bit 2 Data channel 2
Data - Bit 3 Data channel 3
Data - Bit 4 Data channel 4
Data - Bit 5 Data channel 5
Data - Bit 6 Data channel 6
Data - Bit 7 Data channel 7
/ACK Data acknowledge
BUSY Not ready
PE (PAPER END) Paper end
SELECT Device selection
/ AUTO FEED Automatically new line
/ ERROR Device error
/ INIT Reset / Initialization
/ SELECT IN Printer selection
Chassis ground
Pin No.
1
2
3
4
5
6
Abbreviations Meaning
DAT Data channel, mouse Input/output
– n.c.
GND Chassis ground
P5VFK + 5 V (fused)
CLK Clock channel,
mouse
– n.c.
Operating Instructions, Edition 05/2006, A5E00248055-04
Input /Output
Output (open collector)
Output (TTL level)
Output (TTL level)
Output (TTL level)
Output (TTL level)
Output (TTL level)
Output (TTL level)
Output (TTL level)
Output (TTL level)
Input (4.7 kΩ pull up)
Input (4.7 kΩ pull up)
Input (4.7 kΩ pull up)
Input (4.7 kΩ pull up)
Output (open collector)
Input (4.7 kΩ pull up)
Output (open collector)
Output (open collector)
–
Input /Output
–
–
Output
Input/output
–
SIMATIC Rack PC 840 V2