Siemens SIMATIC Rack PC 840 - Page 120

Hardware Information
7-12
SIMATIC Rack PC 840 Manual
A5E00104826-03
LPT1 Parallel Port
The parallel port (LPT 1) on the Rack PC has the following pinout:
1
13
14
25
Figure 7-3 LPT 1 Parallel Port (Socket)
Pin No.
Designation Description Input / Output
1 / Strobe (CLK) Data message Output (open collector)
2 Data - Bit 0 Data line 0 Output (TTL level)
3 Data - Bit 1 Data line 1 Output (TTL level)
4 Data - Bit 2 Data line 2 Output (TTL level)
5 Data - Bit 3 Data line 3 Output (TTL level)
6 Data - Bit 4 Data line 4 Output (TTL level)
7 Data - Bit 5 Data line 5 Output (TTL level)
8 Data - Bit 6 Data line 6 Output (TTL level)
9 Data - Bit 7 Data line 7 Output (TTL level)
10 /ACK Acknowledge Input (4.7 kW pull up)
11 BUSY Not ready Input (4.7 kW pull up)
12 PE No paper Input (4.7 kW pull up)
13 SELECT Device selection Input (4,7 kW pull up)
14 / AUTO FEED Automatic new line Output (open collector)
15 / ERROR Device error Input (4,7 kW pull up)
16 / INIT Reset / Initialization Output (open collector)
17 / SELECT IN Printer selection Output (open collector)
18 - 25 GND Ground -