The Physical Channel

This document describes how a logical device communicates with a physical device over a physical channel.

The physical channel defines the interface between the logical device and the physical device. Typically, this interface is different for each device family and, therefore, the device driver framework does not require a particular type of interface. The only requirement is that the physical channel class is derived from DBase. It is up to the driver writer to define the physical channel class.

Figure 1. Device driver physical channel classes