Data type Range Default value
REG_DWORD 1 - 16 14


Determines how many characters are sent at a time to the transmit FIFO buffer of a National Semiconductor 16550-compatible device.

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The value of this entry is used as the default value for all serial ports on the computer. Settings for specific serial ports are stored in the device-specific subkey for that port in the Enum subkey (HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Enum).

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To change this value, you must edit the registry. To change the TxFIFO setting for a specific serial port, use Device Manager.

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