Dascom 2600 User Guide - Manual (Page 109)

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7.3 Interfaces Specifications
Your matrix printer offers connectivity via a parallel interface, USB and Ethernet interface.
Serial I/O RS232C interface is an option. This appendix informs you about the parallel
Interface, USB, Ethernet interface and optional serial interface RS232C, and describes the
communication between your computer and the printer.
These interfaces are linked to form a called shared interface. Your printer can be configured to
use only one interface or three alternately. When only one interface is used, it is monitored by
the printer. If the printer is configured to use three interfaces simultaneously it monitors all
interfaces for incoming data. As soon as the printer recognizes a signal, it switches to the
respective interface and sends the BUSY signal to the other interface. After finishing the data
transmission, the printer remains switched to the interface for a certain period of time (30
seconds). When this time has elapsed, the controller again enables all interfaces and the
sequence described restarts. If incoming data is on the other interface and the current print
position is not “Top of Form”, a form feed is carried out.