Siemens simatic hmi op27 Equipment Manual page 198

LPT (TP37)
Pin assignment of the 25–pin Sub–D socket:
only
13 1
25 14
OP27, OP37 Equipment Manual
Release 05/99
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Pin TTL (Centronics)
1 – Strobe
2 + Data Bit 0
3 + Data Bit 1
4 + Data Bit 2
5 + Data Bit 3
6 + Data Bit 4
7 + Data Bit 5
8 + Data Bit 6
9 + Data Bit 7
10 – Acknowledge
11 + Busy
12 + Paper End
13 + Select
14 – Auto Feed
15 – Error
16 – Init Printer
17 – Select Input
18...25 Ground (0 V)
Interface Assignments
B-3