Connect-Tek USB-8 Specifications download pdf (Page 24)

USB HID Swipe Reader

COMMAND NUMBER

This one-byte field contains the value of the requested command number. The following table

lists all the existing commands.

Value

Command Number

Description

GET PROPERTY

Gets a property from the device

SET PROPERTY

Sets a property in the device

RESET DEVICE

Resets the device

DATA LENGTH

This one-byte field contains the length of the valid data contained in the Data field.

DATA

This multi-byte field contains command data if any. Note that the length of this field is fixed at

22 bytes. Valid data should be placed in the field starting at offset 2. Any remaining data after

the valid data should be set to zero. This entire field must always be set even if there is no valid

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

SUCCESS

The command completed successfully.

FAILURE

The command failed.

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 0.

The Set Property command sets a property in the device. The Set Property command number

is 1.

The Get and Set Property command data fields for the requests and responses are structured as

follows:

1 2 ... 19 20 21 22 23 24 25 26 27 28 29 ... 33 34

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Connect-Tek USB-8 Specifications Page 24

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