Read Barcode (BCR Only)

Command 0x1804 - Read Barcode (BCR Only)

The host uses this command to direct the device to arm or disarm the barcode reader for reading a barcode outside the scope of a transaction. This is an immediate directive. To read barcodes within the scope of a transaction, use Command 0x1001 - Start Transaction and its barcode reader parameters instead.

The sequence of events is as follows:

1

The host ensures the device is not currently running another command, for example, that it is not running a transaction using Command 0x1001 - Start Transaction.

2

The host composes a command request in the format below and sends it to the device.

3

If the device has a display, it shows a prompt SCAN BARCODE.

4

The device enables the barcode reader.

If the Timeout parameter is set to Infinite:

• The device returns a command response message with Response Status, Operation Status Summary byte set to 0x00 (OK, Done) after which the host is free to send further commands.

• The host may end the barcode reading session by calling this command again with the Enable parameter set to Disable.

If the Timeout parameter is set to a value other than Infinite:

• The device returns a command response message with its Response Status, Operation Status Summary byte set to 0x01 (OK, Started / Running).

• While the host is waiting for the timeout to expire, it should not send any commands to the device, because the device is busy processing the current command.

• After the device reads a barcode or the timeout period expires, the device sends Notification 0x1805 - User Interface Operation Complete to report Barcode Reader / Read Barcode Result and additional supporting information.

Table - Request Data for Command 0x1804 - Read Barcode (BCR Only)

Tag	Len	Value / Description	Typ	Req	Default
Beginning of any wrappers, at minimum including Request Message
1804 = Command 0x1804 - Read Barcode (BCR Only)
81	01	Enable - 0x00 = Disable. The device disables the barcode reader. In this case, the device ignores all other parameters. - 0x01 = Enable. The device enables the barcode reader.	B	R	0x00
82	01	Timeout - 0x00 = Infinite. The device leaves the barcode reader enabled until it reads a barcode, or until the host sends this command again to disable the barcode reader. - All other values = Timeout in seconds for the device to leave the barcode reader enabled without reading a barcode.	B	O	0x00
83	01	Encrypt Barcode Data - 0x00 = Do Not Encrypt. The device does not encrypt the barcode data when it sends Notification 0x1805 - User Interface Operation Complete. - 0x01 = Encrypt. The device encrypts the barcode data when it sends Notification 0x1805 - User Interface Operation Complete.	B	O	0x00
End of any wrappers, at minimum including Request Message

Table - Response Data for Command 0x1804 - Read Barcode (BCR Only)

Tag	Len	Value / Description	Typ	Req	Default
Beginning of any wrappers, at minimum including Response Message
1804 = Command 0x1804 - Read Barcode (BCR Only)		No parameters.
End of any wrappers, at minimum including Response Message

Table - Request Example

Example (Hex)

AA00 810401031804 840B 1804 810101 82010F 830101

Table - Response Example

Example (Hex)

AA00 810482031804 820401000000