SATO SG112 ex Programming Reference Manual page 487

Timing chart of multiple receive
1) Normal process
Power On
Printer
DATA Initializing
STROBE
ACK
BUSY
SELECT
PE
FAULT
Printer Status
Press the LINE key
ESC A . . ESC Z (1) ESC A . . . ESC Z (2)
Online
Receive/Analysis/Edit (1) Receive/Analysis/Edit (2)
Printing (1)
Press the LINE key Receive buffer near full state
ESC A . . ESC Z (3)
Offline
Receive/Analysis/Edit (3)
Printing (2)
486
Receive buffer near full release
Online
Printing (3)