SATO SG112 ex Programming Reference Manual page 460

Timing chart of multiple receive
1) Normal process
Power On
Printer
SD
Initializing
XON
500 msec
RD
Printer Status
2) Error process
Head open
Printer
SD
STX . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ETX (1)
RD
Printer Status
* When the paper end error occurs, open the head, set label, close the head and feed.
Note: (1) The paper end error will be released when the head is closed.
(2) XOFF will be sent when data is received during an error.
XON
STX.ETX (2)
STX.ETX (1)
Receive/Analysis/Edit (1) Receive/Analysis/Edit (2)
Note: The printer will be polled by ON at intervals of 500 msec from the initializing to the first data reception.
Head close
Press the LINE key
XOFF XON
Offline
Receive/Analysis/Edit (1)
Receive buffer near full release
Receive buffer near full state
XOFF XON
Online
Printing (1)
Paper end error
XOFF
STX . . . . . . . . . . . ETX (2)
Online
Receive/Analysis/Edit (2)
Printing (1)
459
Press the LINE key
XOFF
STX.ETX (3)
STX . . . . . . . . . . ETX (4)
Offline
Receive/Analysis/Edit (3) Receive/Analysis/Edit (4)
Printing (2)
Press the LINE key
XON
XOFF
Offline
*
Press the LINE key
XON
Printing (3)
Printing (1)