External network adapter for handling normal and alternate channel data over a single bi-directional channel connected to a printer
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United States of America Patent
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-
Jul 22, 1997
Grant Date -
N/A
app pub date -
Jun 23, 1995
filing date -
Jun 23, 1995
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
An External Network Adapter (ENA) is provided that acts as an interface between a network and a parallel or serial port of at least one printer, in which host computers on the network may send print jobs to the External Network Adapter, and these print jobs will be communicated to the printers in a manner that the print jobs will be printed correctly. The External Network Adapter can additionally receive NPAP queries and NPAP commands from a host computer over the network, and transfer those NPAP queries or commands to each of the printers at virtually any time, including during a print job. If the ENA receives any NPAP query or NPAP command from a host computer via the network, such NPAP queries or commands are sent to the printer between print job packets. In this manner, the ENA emulates having a second or Alternate Channel of communications to the printer, since NPAP queries or commands can be sent to the printer in the middle of a print job, whether the print job consists of host-packetized NPAP print data or non-NPAP print data.
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