Seiko Instruments SII Black-and-White Raster Plotter LP-1020 - Manual (Page 210)

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●PORT
Port is enabled and can be specified when <ON (PORT)> is selected from
the operation TRAP** job menu. After completion of printing all jobs
transmitted to the specified port of this device, TRAP is transmitted to the
TRAP manager.
<Parameter (choice input method)> : Default value
ALL/PORT1/PORT2/ ⋅⋅⋅/PORT10