Configuration of Plug and Play Serial Device that Requires a 16550 UART-Compatible Interface

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This section describes the typical configuration of hardware, drivers, and device stacks that is used for serial devices that:

  • Support Plug and Play.

  • Require a 16550 UART-compatible interface.

  • Are not connected to an RS-232 port.

An example is a PCMCIA card with a modem.

The following diagram shows the typical configuration for a sample toaster device and a sample blender device that require a 16550 UART-compatible interface.

Diagram showing hardware configuration for a Plug and Play toaster device on a PCMCIA card (left) and configuration of drivers and device stacks for the same device (right).

In these configurations, the Toaster device is a child device on a PCMCIA bus. The PCMCIA bus driver creates a PDO for the Toaster device when it enumerates the PCMCIA card. The INF file for the Toaster device specifies Serial as a lower-level device filter driver. Serial provides a 16550 UART-compatible interface to the hardware device. The Toaster driver creates and attaches an FDO to the Toaster device stack.