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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 because 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 communication. 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.
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