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How can I determine the baud rates supported by my serial driver? My driver details (from the Device Manager) follow, but they do not seem very helpful. I am writing an application that is crashing because I am apparently attempting to to set COM1 to an unsupported baud rate, so I need to know which baud rates the driver does support. Any suggestions would be appreciated. Thanks.

Driver files:

C:\Windows\system32\drivers\serenum.sys

C:\Windows\system32\drivers\serial.sys

Provider: Microsoft Corporation File

Version: 5.1.2600.5512 (xpsp.080413-2108)

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1 Answer 1

up vote 1 down vote accepted

Serial.sys appears to support up to 115200bps (112.5kbps). Below that, it is determined by the device AFAIK.

Otherwise I think you'll have to look at GetCommProperties for Win32 (Platform SDK) serial communications, or the SerialPort class in .NET Framework v2.0+.

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