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Chapter 16 and notifications to get and set RS-232 status and control signals and asynchro- nous port parameters. Data uses a CD ...

Using Generic USB Controllers the virtual COM-port device can NAK attempts by the USB host to send data. When the remote device ...

Chapter 16 Table 16-2: The abstract control model defines a set of required and optional requests that travel in control transfe ...

Using Generic USB Controllers serial port parameters. The line-coding information travels in the data stage of the request: In t ...

Chapter 16 3  Abstract control model devices support up to three notifications: Each notification begins with an 8-byt ...

Using Generic USB Controllers signals and other status information. In the notification, wValue = 0x0000, wLength = 0x0002, and ...

Chapter 16 on an internal serial port. On a USB virtual COM-port device, the host must send a request in a control transfer to p ...

Using Generic USB Controllers Figure 16-1: A typical CDC device that supports the abstract control model has these descriptors. ...

Chapter 16 Table 16-3: Example descriptors for a full-speed CDC device (Sheet 1 of 4).    bLength 0x12 Descrip ...

Using Generic USB Controllers "    bLength 0x09 Descriptor size in bytes (9) bDescriptorType 0x04 Descriptor ...

Chapter 16    1    bFunctionLength 0x05 Descriptor size in bytes (5) bDescriptorType 0x24 CS_I ...

Using Generic USB Controllers descriptor from a device, the device returns the lesser of wTotalLength bytes and the number of by ...

Chapter 16 face handles device management and call management. The bInterfaceSubClass field specifies a communication model. Tab ...

Using Generic USB Controllers class interface. However, the value isn’t used if the device doesn’t handle call management. If th ...

Chapter 16 tion data. For example, a telephone device might use an audio interface to send and receive voice data. The example d ...

Using Generic USB Controllers PacketSize bytes. A zero-length packet (ZLP) is a short packet that contains a PID and error-check ...

Chapter 16 character and are not null terminated. A string descriptor can contain up to 126 U.S. English characters. As Chapter ...

Using Generic USB Controllers ; Windows INF File for a USB virtual COM-port device ; in the communication devices class (CDC) [V ...

Chapter 16 codes in the interface descriptors. When a single function uses multiple inter- faces, a device can use an interface ...

Using Generic USB Controllers Device Configuration Interface (CDC Communication) Interface (CDC Data) Header Functional Abstract ...