3–74 Operator ManualStatus EnquiryWhen this parameter is enabled, the host may send an enquiry packet to theprinter requesting status. The printer will then send back a 1 byte packet denot-ing the status of the printer. If this option is set to OFF (the default), no packetwill be sent back. The Status Enquiry feature may be enabled in conjunction withany other protocol. When enabled and the host sends an ENQ character, theprinter responds by sending a printer status byte. The status byte is designed tobe a printable code and is the only printable code the printer can transmit.The bit pattern is as follows:Bit Meaning/Value7 Parity if 7 bit data and parity enabled (MSB)6 Always a 15 1 if Data Overrun4 Always a 03 1 if Parity Error2 1 if Paper System Error or Platen Open1 1 if Offline0 1 if Busy (fault or buffer full) (LSB)The Status Enquiry Feature is slightly different when the current emulation is theHP2564C. Instead of responding to the ENQ character, the printer will respondto the ESC ? DC1 sequence. The bit pattern of the status response is as follows:Bit Meaning/Value7 Parity if 7 bit data and parity enabled (MSB)6 Always a 05 Always a 14 Always a 13 0 if Parity Error, Data Overrun, or Buffer Overflow2 1 if Offline1 1 if Busy (fault or buffer full)0 1 if Paper System Error or Platen Open (LSB)DTR 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, some cablingsystems require the DTR Line of the printer to be configured differently. Thiscabling scheme can interfere with printer transmission or host reception of theXoff signal when using the Xon/Xoff Serial Protocol. This situation can result inBuffer Overflow and Data Overrun situations and loss of data.Config Menu⇒ Serial I/O
