Compaq 99875320-5 Manual De Usuario

data.  The HID specification requires that Reports be fixed in length.  Command data may vary 
in length.  Therefore, the Report should be filled with zeros after the valid data. 
 
RESULT CODE 
 
This one-byte field contains the value of the result code.  There are two types of result codes:  
generic result codes and command-specific result codes.  Generic result codes always have the 
most significant bit set to zero.  Generic result codes have the same meaning for all commands 
and can be used by any command.  Command-specific result codes always have the most 
significant bit set to one.  Command-specific result codes are defined by the command that uses 
them.  The same code can have different meanings for different commands.  Command-specific 
result codes are defined in the documentation for the command that uses them.  Generic result 
codes are defined in the following table. 
 

00 

SUCCESS 

The command completed successfully. 

01 

FAILURE 

The command failed. 

02 

BAD_PARAMETER 

The command failed due to a bad 
parameter or command syntax error. 

 
GET AND SET PROPERTY COMMANDS 
 
The Get Property command gets a property from the device.  The Get Property command 
number is 0x00. 
 
The Set Property command sets a property in the device.  The Set Property command number 
is 0x01. 
 
The Get and Set Property command data fields for the requests and responses are structured as 
follows: 
 
Get Property Request Data: 

0 Property 

ID 

 
Get Property Response Data: 

0 – n 

Property Value 

 
Set Property Request Data: 

0 Property 

ID 

1 – n 

Property Value 

 
Set Property Response Data: 
None 
 

  15