Siemens SIMATIC Rack PC 840 V2 - Page 104

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. –