Parallel Port - IBM eServer 370 xSeries User Reference Manual

The following table shows the pin-number assignments for the serial-port
connectors.
When you turn on your server, the POST routine assigns the serial ports to specific
communication port addresses.
Some application programs use only certain ports, and some modems are designed
for use only at certain communication port addresses. You might need to use the
Configuration/Setup Utility program to change communication port address
assignments to resolve conflicts.

Parallel port

The parallel port usually is used to communicate with printers, and transfers data
one byte at a time using DMA. The parallel port has a 25-pin, female D-shell
connector on the back of your server. (See "Input/output connectors and expansion
slots" on page 11 for the location of the connector.)
The following table shows the pin-number assignments for the parallel-port
connector.
When you turn on your server, the POST routine assigns the parallel port a specific
port address. You can change the parallel-port assignment by using the
Configuration/Setup Utility program.
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xSeries 370 User's Reference
Table 7. Serial port pin-number assignments
Pin Signal
1 Data carrier detect
2 Receive data
3 Transmit data
4 Data terminal ready
5 Signal ground
13
Table 8. Parallel port pin-number assignments
Pin Signal
1 STROBE
2 Data 0
3 Data 1
4 Data 2
5 Data 3
6 Data 4
7 Data 5
8 Data 6
9 Data 7
10 -ACK
11 BUSY
12 PE (paper end)
13 SLCT (select)
Pin
6
7
8
9
25
Pin
14
15
16
17
18
19
20
21
22
23
24
25
Signal
Data set ready
Request to send
Clear to send
Ring indicator
1
14
Signal
-AUTO FEED XT
-ERROR
-INIT
-SLCT IN
Ground
Ground
Ground
Ground
Ground
Ground
Ground
Ground