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.
Table 7. Serial port pin-number assignments
Pin
Signal
Pin
Signal
1
Data carrier detect
6
Data set ready
2
Receive data
7
Request to send
3
Transmit data
8
Clear to send
4
Data terminal ready
9
Ring indicator
5
Signal ground
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.)
13
1
25
14
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.
Table 8. Parallel port pin-number assignments
Pin
Signal
Pin
Signal
1
STROBE
14
-AUTO FEED XT
2
Data 0
15
-ERROR
3
Data 1
16
-INIT
4
Data 2
17
-SLCT IN
5
Data 3
18
Ground
6
Data 4
19
Ground
7
Data 5
20
Ground
8
Data 6
21
Ground
9
Data 7
22
Ground
10
-ACK
23
Ground
11
BUSY
24
Ground
12
PE (paper end)
25
Ground
13
SLCT (select)
96
xSeries 370 User's Reference
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