Compaq 99875320-5 Manual De Usuario

The result codes for the Get and Set Property commands can be any of the codes list in the 
generic result code table. 
 
Property ID is a one-byte field that contains a value that identifies the property.  The following 
table lists all the current property ID values: 
 

00 

SOFTWARE_ID 

The device’s software identifier 

01 

SERIAL_NUM 

The device’s serial number 

02 

POLLING_INTERVAL 

The interrupt pipe’s polling interval 

03 

MAX_PACKET_SIZE 

The interrupt pipe’s packet size 

04 

TRACK_ID_ENABLE 

Allows tracks to be disabled 

10 

INTERFACE_TYPE 

Type of USB interface 

1A 

DECODE_ENABLE 

Enables decoding for certain formats 

 
The Property Value is a multiple-byte field that contains the value of the property.  The number 
of bytes in this field depends on the type of property and the length of the property.  The 
following table lists all of the property types and describes them. 
 

Property Type  Description 
Byte 

This is a one-byte value.  The valid values depend on the property. 

String 

This is a multiple-byte ASCII string.  Its length can be zero to a 
maximum length that depends on the property.  The value and 
length of the string does not include a terminating NUL character. 

 
SOFTWARE_ID PROPERTY 
 
Property ID: 

0x00 

Property Type: 

String 

Length: 

Fixed at 11 bytes 

Get Property: 

Yes 

Set Property: 

No 

Description: 

This is an 11-byte read only property that identifies the software part number 
and version for the device.  The first 8 bytes represent the part number and the 
last 3 bytes represent the version.  For example this string might be 
“21042812D01”.  Examples follow: 

 
Example Get Software ID property Request (Hex): 

00 01 

00 

 
Example Get Software ID property Response (Hex): 

00 

01 

32 31 30 34 32 38 31 32 44 30 31 

 

 

16