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4505/4505ps or 4510/4510ps User’s Guide
The 4505/4505ps printers provide a parallel port, serial port,
and
one
additional network interface port option,
all of which
may be active at the same time
.
The 4510/4510ps printers provide a parallel port, serial port,
and
three
additional network interface port options,
all of
which may be active at the same time
.
To coordinate automatic switching among the ports, the
printer monitors the parallel, serial, and network interface
ports for incoming data. When a print job is detected on one
port, the printer sends a busy signal to the other ports and
queues the print job into memory for processing. This is
called
port polling
. Note that while all ports may be
simultaneously active, only one port at a time is able to
receive a print job.
For the 4505/4505ps printers:
When print jobs are pending on all three ports (parallel,
serial, and the network interface port), the port polling
sequence is:
1 Parallel
2 Serial
3 Network
4 Back to Parallel
AUG-APPC Page 2 Black Saturday, January 21, 1995 7:14 PM