Compaq 99875320-5 manual Result Code, GET and SET Property Commands

Section 4. USB Communications

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.

Value	Result Code	Description
(Hex)
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:

Data Offset	Value
0	Property ID

Get Property Response Data:

Data Offset	Value
0 – n	Property Value

Set Property Request Data:

	Data Offset	Value
	0	Property ID
	1 – n	Property Value
Set Property Response Data:
None

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