Brother PT-P900 Reference Manual page 43

7.2.3.5. Socket communication connection close
For the operation of row number 46: SP.SOCCLOSE, refer to "MELSEC iQ-F FX5 User's Manual (Ethernet
Communication)" for the Mitsubishi Electric programmable controller.
Row number 49/50: When close processing is completed, turns OFF the variable of above control.
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MELSEC iQ-F Brother Label Printer Sample Program Reference Manual