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- DOCUMENT:Q100372 19-OCT-1993 [W_NT]
- TITLE :Detecting Windows NT Serial Ports
- PRODUCT :Windows NT
- PROD/VER:3.10
- OPER/SYS:WINDOWS
- KEYWORDS:
-
- --------------------------------------------------------------------
- The information in this article applies to:
-
- - Microsoft Windows NT operating system version 3.1
- - Microsoft Windows NT Advanced Server version 3.1
- --------------------------------------------------------------------
-
- WARNING: Using Registry Editor incorrectly can cause
- serious, system-wide problems that may require you to
- reinstall Windows NT to correct them. Microsoft cannot
- guarantee that any problems resulting from the use of
- Registry Editor can be solved. Use this tool at your own
- risk.
-
-
- Windows NT manages serial (COM) ports somewhat differently from the
- way Windows 3.1 does. In Windows 3.1, you can observe and configure
- all the COM ports from Ports in Control Panel. In Windows NT, only
- unused COM ports are displayed in Control Panel. For example, if a
- mouse is connected to COM1, COM1 is not available in Control Panel,
- nor is it listed. To check a COM port and perform any trouble-shooting
- steps, you need to use Registry Editor.
-
- Finding Serial Ports in Registry Editor
- ---------------------------------------
-
- To determine what is using a COM port, from Registry Editor go to the
- following hive and subkey:
-
- \HKEY_LOCAL_MACHINE\HARDWARE\DESCRIPTION\System
- \MultifunctionAdapter\0\SerialController\...
-
- Note: If you have an EISA type machine, MultifunctionAdapter will be
- EisaAdapter.
-
- Each COM port is stored in one of the numbered subkeys. If you have
- two COM ports, COM1 and COM2, you would find them stored under 0 and
- 1, respectively.
-
- If a mouse is using a COM port, you will find a PointerPeripheral
- subkey under the serial ports subkey. For example: If you have a mouse
- on COM1, you would see the following:
-
- ...\SerialController\0\PointerPeripheral
-
- If PointerPeripheral is absent, then the serial port is in use by some
- other device.
-
- Additional Differences in Windows NT Control Panel
- --------------------------------------------------
-
- You might notice an additional difference in Windows NT Control Panel.
- If you select a COM port, choose Settings, and then choose Advanced,
- the following message may be displayed in a dialog box:
-
- There are no user configurable Advanced I/O parameters for this
- COM port.
-
- This means that Windows NT has obtained all the information it needs
- for the port from NTDETECT.COM (or OSLOADER.EXE on RISC-based
- computers). This ensures that redundant or incorrect information is
- not entered.
-
- Additional reference words: 3.10 winnt
- KBCategory:
- KBSubCategory: HRDWR
-
- =============================================================================
-
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-
- Copyright Microsoft Corporation 1993.