Connection Status Device connected
Current Configuration 1
Speed Full (12 Mbit/s)
Device Address 5
Number Of Open Pipes 3

Device Descriptor Keil CDC Device
Offset Field Size Value Description
0 bLength 1 12h
1 bDescriptorType 1 01h Device
2 bcdUSB 2 0110h USB Spec 1.1
4 bDeviceClass 1 02h CDC Control
5 bDeviceSubClass 1 00h
6 bDeviceProtocol 1 00h
7 bMaxPacketSize0 1 08h 8 bytes
8 idVendor 2 C251h Keil Software, Inc.
10 idProduct 2 1605h
12 bcdDevice 2 0100h 1.00
14 iManufacturer 1 01h "Keil Software"
15 iProduct 1 02h "Keil CDC Device"
16 iSerialNumber 1 03h "0001A0000000"
17 bNumConfigurations 1 01h

Configuration Descriptor 1 Bus Powered, 100 mA
Offset Field Size Value Description
0 bLength 1 09h
1 bDescriptorType 1 02h Configuration
2 wTotalLength 2 0043h
4 bNumInterfaces 1 02h
5 bConfigurationValue 1 01h
6 iConfiguration 1 00h
7 bmAttributes 1 80h Bus Powered
 4..0: Reserved  ...00000
 5: Remote Wakeup  ..0.....  No
 6: Self Powered  .0......  No, Bus Powered
 7: Reserved (set to one)
(bus-powered for 1.0)  1.......
8 bMaxPower 1 32h 100 mA

Interface Descriptor 0/0 CDC Control, 1 Endpoint
Offset Field Size Value Description
0 bLength 1 09h
1 bDescriptorType 1 04h Interface
2 bInterfaceNumber 1 00h
3 bAlternateSetting 1 00h
4 bNumEndpoints 1 01h
5 bInterfaceClass 1 02h CDC Control
6 bInterfaceSubClass 1 02h Abstract Control Model
7 bInterfaceProtocol 1 00h
8 iInterface 1 00h

Header Functional Descriptor
Offset Field Size Value Description
0 bFunctionLength 1 05h
1 bDescriptorType 1 24h CS Interface
2 bDescriptorSubtype 1 00h Header
3 bcdCDC 2 0110h 1.10

Call Management Functional Descriptor
Offset Field Size Value Description
0 bFunctionLength 1 05h
1 bDescriptorType 1 24h CS Interface
2 bDescriptorSubtype 1 01h Call Management
3 bmCapabilities 1 01h
 7..2: Reserved  000000..
 1: Data Ifc Usage  ......0.  Call management only over Comm Ifc
 0: Call Management  .......1  Handles call management itself
4 bDataInterface 1 01h

Abstract Control Management Functional Descriptor
Offset Field Size Value Description
0 bFunctionLength 1 04h
1 bDescriptorType 1 24h CS Interface
2 bDescriptorSubtype 1 02h Abstract Control Management
3 bmCapabilities 1 02h
 7..4: Reserved  0000....
 3: Connection  ....0...
 2: Send Break  .....0..
 1: Line Coding  ......1.  Line Coding requests and Serial State notification supported
 0: Comm Features  .......0

Union Functional Descriptor
Offset Field Size Value Description
0 bFunctionLength 1 05h
1 bDescriptorType 1 24h CS Interface
2 bDescriptorSubtype 1 06h Union
3 bControlInterface 1 00h
4 bSubordinateInterface0 1 01h "Keil Software"

Endpoint Descriptor 81 1 In, Interrupt, 2 ms
Offset Field Size Value Description
0 bLength 1 07h
1 bDescriptorType 1 05h Endpoint
2 bEndpointAddress 1 81h 1 In
3 bmAttributes 1 03h Interrupt
 1..0: Transfer Type  ......11  Interrupt
 7..2: Reserved  000000..
4 wMaxPacketSize 2 0010h 16 bytes
6 bInterval 1 02h 2 ms

Interface Descriptor 1/0 CDC Data, 2 Endpoints
Offset Field Size Value Description
0 bLength 1 09h
1 bDescriptorType 1 04h Interface
2 bInterfaceNumber 1 01h
3 bAlternateSetting 1 00h
4 bNumEndpoints 1 02h
5 bInterfaceClass 1 0Ah CDC Data
6 bInterfaceSubClass 1 00h
7 bInterfaceProtocol 1 00h
8 iInterface 1 01h "Keil Software"

Endpoint Descriptor 02 2 Out, Bulk, 64 bytes
Offset Field Size Value Description
0 bLength 1 07h
1 bDescriptorType 1 05h Endpoint
2 bEndpointAddress 1 02h 2 Out
3 bmAttributes 1 02h Bulk
 1..0: Transfer Type  ......10  Bulk
 7..2: Reserved  000000..
4 wMaxPacketSize 2 0040h 64 bytes
6 bInterval 1 00h

Endpoint Descriptor 82 2 In, Bulk, 64 bytes
Offset Field Size Value Description
0 bLength 1 07h
1 bDescriptorType 1 05h Endpoint
2 bEndpointAddress 1 82h 2 In
3 bmAttributes 1 02h Bulk
 1..0: Transfer Type  ......10  Bulk
 7..2: Reserved  000000..
4 wMaxPacketSize 2 0040h 64 bytes
6 bInterval 1 00h