SATO SG112 ex Programming Reference Manual page 406

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Data Port and Sub Port
You need to configure both "Data Port" and "Sub Port". The followings are overview of each ports.
Data Port
This port receives print data from PC. All SBPL commands are available in this port.
<Configurable interfaces for the Data Port>
USB, LAN, IEEE1284, RS-232C
The interface configured as Sub Port cannot be used as the Data Port interface.
Sub Port
This port monitors the printer status.
Refer to "Return status" section in "Communication Protocol" for available commands in this port.
<Configurable interfaces for the Sub Port>
None, USB, LAN, IEEE1284, RS-232C
The interface configured as Data Port cannot be used as the Sub Port interface.
Sub Port
- Printer status
- Communication with external devices
Data Port
- SBPL commands (print data)
- Printer status
External device
Example) Verification machine
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