SATO CG412DT Service Manual page 25

Section 3: Interface Specifications
3.2 RS232C HIGH SPEED SERIAL INTERFACE (cont'd)
3.2.4 Return Status (STATUS 3 and Protocol for Driver (STATUS 4))
The purpose of these protocols is to control printer status on the host side. With the request command from
the host, the status is returned from the printer.
After receiving the request command, the status is returned immediately.
In these communication protocols, receive mode is set to multi item buffer.
When the print data (STX ESC+"A"~ ESC+"Z" ETX) is sent from the host in the conditions below, received
data may be incorrect.
1) When the printer is Offline
2) When an error has occurred in the printer
CG4 Series Service Manual Page 3-7