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TallyGenicom 2440 User Guide

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Interfaces
USB interface
B-7
Configuration Descriptor
Interface Descriptor Alternate Setting
Offset
Field
Size
Value
Description
0
bLength
Byte
0x09
Size of this descriptor in bytes.
1
bDescriptorType
Byte
0x02
Configuration  descriptor type.
2
wTotalLength
Word
0x0019
No. of bytes in this configura-
tion. This includes the configu-
ration descriptor plus all of 
interface and endpoint descrip-
tors.
4
bNumInterfaces
Byte
0x01
Project SDM500 has 1 inter-
face.
5
bConfigurationValue
Byte
0x01
Value to use as an argument to 
SetConfiguration() request to 
select this configuration.
6
iConfiguration
Byte
0x00
Index of string descriptor 
describing this configuration.
7
bmAttributes
Byte
0xC0
Configuration characteristics: 
D7 : Reserved (set to 1) D6 : 
Self-powered D5 : Remote 
wakeup D4 . . . D0 : Reserved 
(set to 0) (Self Powered / 
RemoteWakeup UnSupport)
8
MaxPower
Byte
0x31
Maximum power consumption 
of this configuration. (98mA)
Offset
Field
Size
Value
Description
0
bLength
Byte
0x09
Size of this descriptor in bytes.
1
bDescriptorType
Byte
0x04
Interface descriptor type.
2
bInterfaceNumber
Byte
0x00
Number of Interface.
3
bAlternateSetting
Byte
0x00
Value used to select alternate 
setting for the interface identi-
fied in the prior field.
4
bNumEndPoints
Byte
0x02
Number of endpoints used by 
this interface (excluding End-
point 0).
5
bInterfaceClass
Byte
0x07
Class code (Printer class).