Dataproducts Parallel Interface Signals
Data Lines 1 through 8. Provides eight standard or inverted levels from the host
that specify character data, plot data, or a control code. Data Line 8 allows access
to the extended ASCII character set. You can enable or disable this line via the
Data 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 data
strobe remains high until the Data Request line goes false. The active edge of the
strobe signal can be configured as leading, middle (default), or trailing.
Paper Instruction (PI). Carries a DVFU signal from the host with the same timing
and polarity as the data lines.
Ready. Carries a high true signal from the printer when AC power and DC
voltages are present, paper is loaded properly, and the printer is not in a check
condition.
Online. Carries a high true signal from the printer when the Ready Line is true
and the ON LINE key on the control panel has been pressed. When the printer is
in online mode, it may accept data from the host.
Demand/Data Request. Carries a high true signal from the printer when the
printer is ready to accept character data from the host. This signal changes to false
shortly after the leading edge of the data strobe signal.
Cable Verify. Two pins on the interface connector are jumpered together to allow
the user to verify proper installation of the interface connector.
Buffer Clear. A high true level from the host to indicate the printer should perform
a reboot.
Parity Error. Always carries a low false signal from the printer indicating there is
no parity error.
Dataproducts Parallel Interface Configuration
Your printer is configured at the factory to match the interface you specified. By
using the operator panel, you may verify and change several interface parameters
to meet specific application requirements.
Refer to “Dataproducts Menu” on page 132 for Dataproducts parameter
descriptions 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
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