SATO /gt Series Programmer's Reference Manual page 100

Unit 4: Standard Command Codes
ONLINE
FUNCTION Changes the printer from offline to online status.
FORMAT
<ESC>OL
Place anywhere between <ESC>A and <ESC>Z.
EXAMPLE <ESC>A
<ESC>OL
<ESC>Z
OUTPUT This command does not result in printer output.
NOTES Up to 32 characters are available for LCD messages.
In the printer's Receive Mode, specify the single-item buffer mode. This command is
not disclosed to users.
SATO E+ Programming Reference PN 9001149A Page 4-58