Specifications

Section 4. USB Communications

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

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:

Value Property ID Description

0 SOFTWARE_ID The device’s software identifier

1 SERIAL_NUM The device’s serial number

2 POLLING_INTERVAL The interrupt pipe’s polling interval

3 MAX_PACKET_SIZE The interrupt pipe’s packet size

4 TRACK_ID_ENABLE Allows tracks to be disabled

16 INTERFACE_TYPE Type of USB interface

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: 0

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: