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External Modem Registry Key Sample (Windows Embedded CE 6.0)

1/6/2010

A default registry entry always exists for a Hayes-compatible modem that is connected to COM1. You can specify additional external modems under the HKEY_LOCAL_MACHINE\ExtModems key. Most of the values that are set for PCMCIA modems also apply to external modems, except that the following values are ignored for external modems.

Value : type Default Description

TSP

Unimodem.dll

This value is redundant because Unimodem processes the ExtModem keys.

DeviceArrayIndex : REG_DWORD

1

The Serial.dll file uses these registry values when it loads for the port on which the external modem is connected.

Prefix

COM

 

DLL

Serial.dll

 

ResetDelay : REG_DWORD

800

 

The following code example of registry entries will cause TAPI 2.0 to create a line device for the external modem from CompanyX and present it as one of the available TAPI devices. In this minimal example, all of the default settings from the HKEY_LOCAL_MACHINE\Driver\Unimodem\Init and \Settings keys will be used.

[HKEY_LOCAL_MACHINE\ExtModems\CompanyX-Modem]
    "Port"="COM1:"
    "DeviceType"=dword:1
    "FriendlyName"="CompanyX External Modem"
[HKEY_LOCAL_MACHINE\ExtModems\CompanyX-Modem\Init]
[HKEY_LOCAL_MACHINE\ExtModems\CompanyX-Modem\Settings]

See Also

Concepts

TAPI Registry Settings