110Chapter 4 Config MenuDTR FunctionThis parameter allows the user to change the operation of the Data TerminalReady (DTR) line on the printer interface. The DTR line is used to indicateprinter status to the host computer.• Busy (default). In this mode the DTR line is used to signal the host to stopsending data because the printer buffer is 85% full. However, somecabling systems require the DTR Line of the printer to be configureddifferently. This cabling scheme can interfere with printer transmission orhost reception of the Xoff signal when using the Xon/Xoff Serial Protocol.This situation can result in Buffer Overflow and Data Overrun situationsand loss of data.• Offline. When this option is active, the DTR Line is used to signal onlythat the printer is Online or Offline. Unlike the Busy option, the Offlineoption will not interfere with operation of the Xon/Xoff CommunicationProtocol.• Power. When this option is active, the DTR Line is used to signal the hostthat the printer is powered up. This DTR Selection will not interfere withhost reception of the Xoff/Xon Serial Protocol, because unlike the Busyselection, the DTR Signal is not toggled at the same time as the XoffSignal. When using this option, the DTR Polarity parameter must be set toActv Hi.DTR PolarityThis parameter is used to set the DTR Signal polarity. Active Low is thedefault.Busy PolarityThis parameter allows you to control the polarity of the Busy Signal. ActiveLow is the default.RTS FunctionThe RTS line of the serial interface has been used to indicate Busy in additionto the DTR line. This option allows the RTS line to either be continuously Highor to function as Busy (default).Robust XonThis parameter behaves the same as a normal Xon/Xoff protocol, except thatwith this parameter set to On, the Xon code will be sent every 5 secondswhen the printer is ready to accept data. Off is the default.0 1 if Paper System Error or Platen Open (LSB)Table 5. Status Enquiry Response Bit PatternBit Meaning/Value
