
3–31
Chapter 3: Printer Menus and Configuring Your Printer
DTR Function
This parameter allows the user to change the operation of the Data Terminal
Ready (DTR) line on the printer interface. The DTR line is used to indicate
printer status to the host computer.
Busy (Default selection)
In this mode the DTR line is used to signal the host to stop sending data be-
cause the printer buffer is 85% full. However, some cabling systems require
the DTR Line of the printer to be configured differently. This cabling scheme
can interfere with printer transmission or host reception of the Xoff signal when
using the Xon/Xoff Serial Protocol. This situation can result in Buffer Overflow
and Data Overrun situations and loss of data.
Offline
When this selection is active, the DTR Line is used to signal only that the
printer is Online or Offline. Unlike the Busy selection, the Offline selection will
not interfere with operation of the Xon/Xoff Communication Protocol.
Power
When this selection is active, the DTR Line is used to signal the host that the
printer is powered up. This DTR Selection will not interfere with host reception
of the Xoff/Xon Serial Protocol, because unlike the Busy selection, the DTR
Signal is not toggled at the same time as the Xoff Signal. When using this
selection, the DTR Polarity Parameter must be set to Actv Hi.
If your system is configured to use Xon/Xoff Protocol, using the Busy
selection above will cause interference with printer to host communica-
tion. You may however, use the DTR Line to signal the host that the
printer is Offline or that the printer is powered up (Offline and Power
selections, respectively).
DTR Polarity
This parameter is used to set the DTR Signal polarity. Active Low is the default
selection.
Busy Polarity
This parameter allows you to control the polarity of the Busy Signal. Active Low
is the default selection.
RTS Function
The RTS line of the serial interface has been used to indicate Busy in addition
to the DTR line. This option allows the RTS line to either be continuously High
or to function as Busy (default selection).
Robust Xon
This parameter behaves the same as a normal Xon/Xoff protocol, except that
with this parameter enabled, the Xon code will be sent every 5 seconds when
the printer is ready to accept data. OFF is the default selection.
Summary of Contents for T6212
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