SATO GY412 Operator's Manual page 178

Section 7: Interface Specifications
7.5 LOCAL AREA NETWORK (LAN) ETHERNET (cont'd)
2.
2-port connection / ENQ response mode (Protocol for the driver)
Using Port1024 for print main port, and Port1025 for status return.
The status request command received from the host computer outputs the printer status.
3.
1-port connection / ENQ response mode (STATUS3 / STATUS5 protocol)
Using Port1024 for both print main port and status return port.
The print request command received from the host computer outputs ACK.
The status request command received from the host computer outputs the printer status.
(When STATUS3 is in use, labels cannot be issued by printer driver. Also, printer setting tool is not available
for issuing labels.)
7.5.10.2 Protocols
1.
2-port connection / Cyclic response mode (Protocol for the driver)
The printer returns the status at 500ms to 1000ms intervals. When the status request command (ENQ 05H)
is received from the host computer, the latest printer status data is returned.
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GY412 Operator Manual