FS ( e

Bit 3 is available only when command execution (offline) is enabled.

ASB (Automatic Status Back) transmits the status automatically to the printer in real-time. It is called [ASB function] and the status is [ASB status]. If you use the ASB, an application can acquire the printer change in real-time and passively.

Enabling any status (specifying n ≠ 0) starts extended ASB. Then the current extended ASB status is transmitted. After that, when ASB is active, the selected extended ASB status is transmitted each time the status changes.

When specifying n = 0, extended ASB is disabled. While ASB is disabled, the extended ASB status is not transmitted.

Multiple status items can be selected.

When the ASB function is operating, even if the printer is specified as an invalid peripheral device with ESC =, the extended ASB status is transmitted if the status of the printer changes.

This command is effective until ESC @ is executed, the printer is reset, or the power is turned off.

All extended ASB status represents the enabled status whenever the status changes. Therefore, the disabled status items may change, because each status transmission represents the current status.

The extended ASB status is a 4-byte message as shown in the following table.

Send data	Hex	Decimal	Number of bytes
Header	39h	57	1 byte
Status A (∗1)	See the Status A table below.		1 byte
Status B	40h	64	1 byte
NUL	00h	0	1 byte

When block data [Header – NUL] is being transmitted, ASB status cannot be transmitted. Therefore, you cannot get the printer status change through the ASB status when Block data [Header – NUL] is transmitted.

The extended ASB status can be differentiated from other transmission data by the specific data of the transmission data block. When the printer transmits the header [Hex = 39h / Decimal = 57], data up to NUL [Hex = 00h / Decimal = 0] are processed as extended ASB status.