Printronix L5035 user manual Dataproducts Parallel Interface Signals

Dataproducts Parallel Interface

Dataproducts Parallel Interface Signals

The Dataproducts interface signals are defined below.

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 fault condition.

ON LINE - A high true signal from the printer indicating the Ready Line is true and the ONLINE key on the control panel has been activated. The printer is ready to accept data from the host.

DATA REQUEST - A high true signal from the printer to synchronize host data transmission with printer timing. This signal goes true when the printer is ready to receive data. It changes to the false state shortly after the leading edge of the data strobe signal.

DATA STROBE - A high true pulse from the host to indicate that data is ready. The data strobe must remain high at least until the Data Request line goes false.

DATA LINES - 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.

PAPER INST - Optional standard or inverted level VFU control signal from the host with the same timing and polarity as the data lines. Sensing of the PAPER INST line (PI line) is controlled by printer configuration.

NOTE: The PAPER INST line must be disabled (configuration option selected from the control panel) if the host computer does not drive or control it. If the line is not controlled by the host and PAPER INST line sensing is enabled in the printer, rapid paper slewing will occur.

Interface Verification - Two pins on the interface connector jumpered together allow you to verify proper installation of the interface connector.

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