Dataproducts Parallel Interface Signals - Printronix L5000 Series Maintenance Manual

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 ON LINE 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 signal from the host with
the same timing and polarity as the data lines. PI line sensing is controlled by printer
configuration.
NOTE: The PAPER INST Line must be disabled (configuration option selected
Interface Verification – Two pins on the interface connector jumpered together
allow you to verify proper installation of the interface connector.
F–10
from the front 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
paper slewing will occur.
Host I/O Interfaces