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PANDUIT TDP4*H GMTDPH-MAN
Page 6-3
Section 6: Interface Specifications
IEEE1284 Parallel Interface
The parallel interface for the TDP4*H printers is a Plug-In Interface Module that can be installed by the user. It
conforms to the IEEE1284 specification. It will automatically detect the IEEE1284 signals and operate in the high
speed mode. If it does not detect the IEEE1284 signals, it will operate in the standard Centronics mode, which is
significantly slower. For this reason, an interface cable and host interface conforming to the IEEE1284
specification must be present to fully utilize the speed capabilities. This interface also operates bi-directionally
and can report the status of the printer back to the host.
The receiving buffer will not be able to receive more data again until a “Buffer Available” condition occurs. This
takes place when the receiving buffer has emptied so that only 1 MB bytes of data are being held (2.0 MB bytes
from being full). At this time, DTR will go “high” or an X-On is sent to tell the host that it can again receive data.
All printer error conditions (i.e., label out, ribbon out) will cause the printer to go busy (DTR “low” or X-Off) until
the problem is corrected and the printer is placed on-line. The printer will also be busy if taken off-line from the
front panel.
0
2.0 MB
Buffer Near Full
2.95 MB
DTR Low
or
X-Off
DTR High
or
X-On
0
1.0 MB
Buffer Available
2.95 MB
DTR High
or
X-On
DTR Low
or
X-Off