Printronix H-SERIES P7000 - Manual (Page 122)

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Chapter 5 Dataproducts Parallel Interface
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
page 64).
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.