Notification 0x1803 - User Interface Host Action Request

The host uses this command to request that the device display a message for the cardholder.

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 selects the message it wants to display from the list of available pre-determined strings.

3

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

4

The device displays the requested message.

• 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.

• If the Timeout parameter is not set to 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 timeout period expires, the device blanks the display and sends Notification 0x1805 — User Interface Operation Complete to inform the host.

Table - Request Data for Command 0x1803 - Display Message (Display Only)

Tag	Len	Value / Description	Typ	Req	Default
Beginning of any wrappers, at minimum including Request Message
1803 = Command 0x1803 - Display Message (Display Only)
81	01	Timeout - 0x00 = Infinite. Device leaves the requested message on the display until the host initiates a change.	B	O	0x00
		- All other values = Timeout in seconds for the device to display the message.
82	01	Message ID. Specify a Display String ID from section 4.3 Display Strings.	B	O	0x14
End of any wrappers, at minimum including Request Message

Table - Response Data for Command 0x1803 - Display Message (Display Only)

Tag	Len	Value / Description	Typ	Req	Default
Beginning of any wrappers, at minimum including Response Message
1803 = Command 0x1803 - Display Message (Display Only)
No parameters.
End of any wrappers, at minimum including Response Message

Table - Request Example

Example (Hex):

AA00 810401551803 8408 1803 810102 820116

Table - Response Example

Example (Hex)

AA00 810482551803 820401000000 84021803