InfoPrint 5504-R40, User Manual

Page: 230 / 402

230
Chapter 3
PARALLEL PORT
PARALLEL PORT Submenus
Port Type
This menu item selects the type of printer parallel port interface to be used
with the host.
The options are IEEE 1284 (the default), Disable, Centronics, and Ethernet.
Data Bit 8
•
Enable (the default). The PI line is not passed directly from host to printer;
all 8 bits are used for data bits, and characters in the hex 80-FF range can
be accessed.
•
Disable . When the host PI line is enabled, data bit 8 internally indicates
PI line status. To use the PI line, disable data bit 8, and enable the Host PI
configuration option (under the PI Ignored option).
NOTE: Data bit 8 is interpreted as either data bit 8 or PI signal, but never
both. When enabled as data bit 8, data bit 8 has priority over the PI
signal, and all data above hex 7F is used to access character data
and not to interpret PI line data.
Conversely, when data bit 8 is disabled and the PI signal is used, data
bit 8 of the data is reserved for use as the PI function, and you cannot
access characters in the hex 80-FF range. Therefore, to access
characters in the hex 80-FF range, data bit 8 must be enabled.
PI Ignored
The PI (Paper Instruction) signal is used to control vertical paper motion.
•
Enable (the default). Ignores the PI signal and treats the data as
characters or control codes.
•
Disable . Causes the printer to interpret the eight data lines as VFU
commands when the PI signal is true.
Buffer Size in K
This option configures the amount of memory allocated for the ethernet buffer.
The range is 1-16 Kbytes, 32 Kbytes, and 64 Kbytes in 1-Kbyte increments.
The factory default is 16 Kbytes.
Auto Trickle
This feature is used to prevent a host computer from “timing out” because the
parallel interface is “busy” for too long.
•
Enable (factory default). When the printer’s buffers are almost full, the
printer begins to trickle data in from the host (at the rate set in the Trickle
Time menu) until the buffers start to empty out.
•
Disable . The Auto Trickle feature is not used.