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