Unisys E-@CTION EFP9800 - Manual (Page 139)

EFP9800 ESC/POS Commands
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If any of the status items listed above are selected, ASB is enabled and the
printer automatically transmits 4 status bytes whenever the selected status
changes. If no status is selected, ASB is disabled.
In RS-232C communications, all four status bytes are transmitted without
checking DSR. The four bytes must be consecutive, except for XOFF code.
Because status is transmitted when this command is buffered, there may be a
lag between command reception and status transmission, depending on the
receive buffer state.
Note: When this command is enabled, the status transmitted by ASB and by
the Real Time Status Transmission, Transmit Peripheral Device
Status, Transmit Paper Sensor Status, Transmit Printer ID, and
Transmit Status commands must be distinguished.