Dataproducts Parallel Interface SignalsData Lines 1 through 8. Provides eight standard or inverted levels from the hostthat specify character data, plot data, or a control code. Data Line 8 allows accessto the extended ASCII character set. You can enable or disable this line via theData Bit 8 parameter on the Dataproducts submenu (see page 132).Data Strobe. Carries a high true pulse from the host when data is ready. The datastrobe remains high until the Data Request line goes false. The active edge of thestrobe signal can be configured as leading, middle (default), or trailing.Paper Instruction (PI). Carries a DVFU signal from the host with the same timingand polarity as the data lines.Ready. Carries a high true signal from the printer when AC power and DCvoltages are present, paper is loaded properly, and the printer is not in a checkcondition.Online. Carries a high true signal from the printer when the Ready Line is trueand the ON LINE key on the control panel has been pressed. When the printer isin online mode, it may accept data from the host.Demand/Data Request. Carries a high true signal from the printer when theprinter is ready to accept character data from the host. This signal changes to falseshortly after the leading edge of the data strobe signal.Cable Verify. Two pins on the interface connector are jumpered together to allowthe user to verify proper installation of the interface connector.Buffer Clear. A high true level from the host to indicate the printer should performa reboot.Parity Error. Always carries a low false signal from the printer indicating there isno parity error.Dataproducts Parallel Interface ConfigurationYour printer is configured at the factory to match the interface you specified. Byusing the operator panel, you may verify and change several interface parametersto meet specific application requirements.Refer to “Dataproducts Menu” on page 132 for Dataproducts parameterdescriptions and information on selecting values for the following parameters:Data Bit 8 (enable or disable)PI Ignored (enable or disable)Data Polarity (standard or inverted)Data Request Polarity (standard or inverted)Strobe Polarity (standard or inverted)Chapter 5. Printer Interfaces 213
