Toshiba B-EV4 Series Manual page 172

Notes (1) This command is available only for the RS-232C, USB interfaces and socket
communications.
(2) The printer returns the status only for the interface which sent this command to
the host.
(3) After the code of the Writable Character Command ([ESC] XD) or Graphic
Command ([ESC] SG) is received, the Status Request Command is not
processed until the printer receives the data specified for the type of data.
(4) A max. delay of 20 msec may occur until the printer sends the status after
receiving the Status Request Command.
(5) The interval from when the Status Request Command is sent to when the next
Status Request Command is sent should be 20 msec or more. If the interval is
less than 20 msec, the printer may fail to receive the Status Request Command.
Example [ESC] WB [LF] [NUL]
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