SATO GY412 Operator's Manual page 177

Section 7: Interface Specifications
7.5 LOCAL AREA NETWORK (LAN) ETHERNET (cont'd)
7.5.9 Connection and Disconnection of Session
The following is the procedure for connection and disconnection of Port1024 (for print main port) and
Port1025 (for status return) in socket server function.
1) Print main port (Port1024), Status return port (Port1025)
7.5.10 Printer Status
7.5.10.1 Mode
There are three types of modes for status return in the LAN interface.
1.
2-port connection / Cyclic response mode (Protocol for the driver)
Using Port1024 for print main port, and Port1025 for status return.
The printer outputs the printer status at regular cycles. Also, receiving the status request command outputs
the latest printer status.
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GY412 Operator Manual