Printronix

P9212, Setup Manual

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4–4 Printer Interfaces
Dataproducts Parallel Interface Signals
Table 4–1 lists the Dataproducts interface connector pin assignments.
Dataproducts-compatible interface signals between the computer and the
printer are defined as follows:
Data Lines 1 through 8 — Eight standard or inverted levels from the host
that specify character data, plot data, or a control code. Sensing Data Line 8
is controlled by printer configuration.
Data Strobe — A high true pulse from the host to indicate that 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 (default) or
trailing.
Paper Instruction (PI) — Optional standard or inverted level EVFU or
DAVFU signal from the host with the same timing and polarity as the data
lines. PI line sensing is controlled by printer configuration.
NOTE: The PI line must be disabled (a configuration option selected from
the control panel) if the host computer does not drive or control the
PI line. If the line is not controlled by the host, and sensing is
enabled, rapid vertical paper movement (“slewing”) will occur.
Ready — A high true signal from the printer indicating AC power and DC
voltages are present, paper is loaded properly, and the printer is not in a
check condition.
Online — A high true signal from the printer indicating the Ready Line is
true and the ON LINE key on the control panel has been activated. The
printer is ready to accept data from the host.
Demand — A high true signal from the printer to indicate that the printer is
ready to accept character data from the host. The signal changes to false
shortly after the leading edge of the data strobe signal.
Cable Verify — Two pins on the interface connector jumpered together to
allow the user to verify proper installation of the interface connector.