Connect-Tek USB-8 Specifications download pdf (Page 25)

Section 4. USB Communications

Get Property Request Data:

Data Offset

Value

Property ID

Get Property Response Data:

Data Offset

Value

0 – n

Property Value

Set Property Request Data:

Data Offset

Value

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

(Hex)

Property ID

Description

SOFTWARE ID

The device’s software identifier

SERIAL NUM

The device’s serial number

POLLING INTERVAL

The interrupt pipe’s polling interval

MAX PACKET SIZE

The interrupt pipe’s packet size

TRACK ID ENABLE

Allows tracks to be disabled

INTERFACE TYPE

Type of USB interface

HOST POLL TIMEOUT

Allows USB poll timeout to be adjusted

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

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Connect-Tek USB-8 Specifications Page 25

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