Putting Serial-Port Technology in Perspective, Part 1
Putting Serial-Port Technology in Perspective, Part 2
Getting to Know the RS-232 Standard
RS-232 / RS-422 / RS-485 Comparison
Serial Port Controller (HITR chapter, PDF)
Serial Port Pinout
DE9 Connector
DB25 Connector
95A Serial Ports
Serial ADF
Serial Port Pinout
DE9 Connector (male)
Pin |
Signal |
1 |
Data Carrier Detect |
2 |
Receive Data |
3 |
Transmit Data |
4 |
Data Terminal Ready |
5 |
Signal Ground |
6 |
Data Set Ready |
7 |
Request To Send |
8 |
Clear To Send |
9 |
Ring Indicator |
DB25 Connector (male)
Pin |
Signal |
Pin |
Signal |
1 |
N/C |
14 |
N/C |
2 |
Transmit Data |
15 |
N/C |
3 |
Receive Data |
16 |
N/C |
4 |
Request To Send |
17 |
N/C |
5 |
Clear To Send |
18 |
N/C |
6 |
Data Set Ready |
19 |
N/C |
7 |
Signal Ground |
20 |
Data Terminal Ready |
8 |
Data Carrier Detect |
21 |
N/C |
9 |
N/C |
22 |
Ring Indicator |
10 |
N/C |
23 |
N/C |
11 |
N/C |
24 |
N/C |
12 |
Reserved |
25 |
N/C |
13 |
N/C |
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95A Serial Ports
Serial Port A can be used to remote start your system.
Go to JMP4
to get more info... To add more serial devices to your server, you
can install serial adapters in the expansion slots, and then attach the
devices to the connectors on the adapters. In some specialized cases,
an ASCII display station can be attached to a serial connector (see
ASCII Display Stations).
The system board provides two 9-pin D-shell connectors
to the serial port controllers on the system board. The serial ports
do not support current loop.
95A Serial ports use the National Semiconductor's
DS75154 Quad Line Receiver.
Serial ADF
Note: Not all choices may be available or appear in the same order
on different systems.
First Serial Port (A)
The serial port connector can be assigned as Serial 1
through Serial 16, or disabled. Standard usage of interrupt levels
is IRQ 4 for serial 1 and IRQ 3 for any other serial level.
<SERIAL 1,
IRQ 4 (io 03f8h-03ffh 83f8h-83ffh 4620h-4620h int 4)>, 2, 3 (02f8-02ff
82f8-82ff 4621-4621 int 3), 3, 3 (3220-3227 0b220-0b227 4622-4622 int 3),
4, 3 (3228-322f 0b228-0b22f 4623-4623 int 3), 5, 3 (4220-4227 0c220-0c227
4624-4624 int 3), 6, 3 (4228-422f 0c228-0c22f 4625-4625 int 3), 7, 3 (5220-5227
0d220-0d227 4626-4626 int 3), 8, 3 (5228-522f 0d228-0d22f 4627-4627 int
3), 9, 3 (3a20-3a27 0ba20-0ba27 4628-4628 int 3), 10, 3 (3a28-3a2f 0ba28-0ba2f
4629-4629 int 3), 11, 3 (3a30-3a37 0ba30-0ba37 462a-462a int 3), 12, 3
(3a38-3a3f 0ba38-0ba3f 462b-462b int 3), 13, 3 (3a80-3a87 0ba80-0ba87 462c-462c
int 3), 14, 3 (3a88-3a8f 0ba88-0ba8f 462d-462d int 3), 15, 3 (3a90-3a97
0ba90-0ba97 462e-462e int 3), 16, 3 (3a98-3a9f 0ba98-0ba9f 462f-462f int
3), "SERIAL 4, IRQ 4, CUSTOM (3228-322f 0b228-0b22f
4623-4623 int 4), 5, 4 (4220-4227 0c220-0c227 4624-4624 int 4),
6, 4,
(4228-422f 0c228-0c22f 4625-4625 int 4), 7, 4 (5220-5227 0d220-0d227
4626-4626 int 4), 8, 4 (5228-522f 0d228-0d22f 4627-4627 int 4), 9, 4 (3a20-3a27
0ba20-0ba27 4628-4628 int 4), 10, 4 (3a28-3a2f 0ba28-0ba2f 4629-4629 int
4), 11, 4 (3a30-3a37 0ba30-0ba37 462a-462a int 4), 12, 4 (3a38-3a3f
0ba38-0ba3f 462b-462b int 4), 13, 4 (3a80-3a87 0ba80-0ba87 462c-462c
int 4), 14, 4 (3a88-3a8f 0ba88-0ba8f 462d-462d int 4), 15, 4 (3a90-3a97
0ba90-0ba97 462e-462e int 4), 16, 4 (3a98-3a9f 0ba98-0ba9f 462f-462f int
4), Disabled
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