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4.989 bytes |
Service Hints & Tips |
Document ID: DSHY-3P5QW4 |
TP General - How to enable the external serial port on your ThinkPad
Applicable to: World-Wide
SYMPTOM:
The ThinkPad is not communicating with an external serial device.
CONFIGURATION:
Any ThinkPad trying to utilize the external serial port. Applicable operating systems: Windows 3.1, Windows 95, Windows NT 4.0, OS/2 3.0, OS/2 4.0
RESOLUTION:
By default, currently available ThinkPads come with the external serial port disabled and Infrared enabled on COM 1. To use the serial port on COM 1 you must either disable infrared or change infrared so that it uses alternate resources. If you are not using infrared for printing or file sharing it is recommended that it be disabled.
To disable infrared and enable the serial port on COM 1 do the following.
1. Double-click your ThinkPad Features or ThinkPad Configuration icon located in the ThinkPad folder on your desktop.
2. Locate the Infrared button located on the left-hand side of this configuration screen and click it once.
(Note: If you hold your mouse pointer over any of the icons in this configuration screen the button will be identified at the bottom in the status window.)
3. Change Infrared from "Enable" to "Disable" and click "OK".
4. Locate the serial port icon and click it once.
5. Select serial port "enable" and insure that the COM PORT setting is "COM 1" and click "OK".
6. Shut down and restart the computer.
More Information:
There are many different combinations of port settings that are possible. The following table indicates the standard settings for the four available COM Ports.
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COM Port |
Port Address |
IRQ |
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COM 1 |
03F8 |
4 |
|
COM 2 |
02F8 |
3 |
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COM 3 |
03E8 |
4 |
|
COM 4 |
02E8 |
3 |
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Hint Category |
General Information | |
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Date Created |
24-11-97 | |
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Last Updated |
02-04-98 | |
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Revision Date |
12-03-99 | |
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Brand |
IBM ThinkPad | |
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Product Family |
ThinkPad 365X/XD, ThinkPad 380, ThinkPad 380D, ThinkPad 380E, ThinkPad 380ED, ThinkPad 380XD, ThinkPad 385D, ThinkPad 385E, ThinkPad 385ED, ThinkPad 385XD, ThinkPad 560, ThinkPad 560E, ThinkPad 560X, ThinkPad 755C/CS, ThinkPad 755CE/CSE, ThinkPad 755CX, ThinkPad 755CV, ThinkPad 755CD, ThinkPad 755CDV, ThinkPad 760C, ThinkPad 760E, ThinkPad 760CD, ThinkPad 760L/LD, ThinkPad 760ED, ThinkPad 760XD, ThinkPad 760EL/ELD, ThinkPad 760XL, ThinkPad 765L, ThinkPad 765D, ThinkPad 770 | |
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Machine Type |
2635, 2640, 9545, 9546, 9547, 9548, 9549 | |
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Model |
Various | |
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TypeModel |
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Retain Tip (if applicable) |
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Reverse Doclinks |