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B–5
Host I/O Interfaces
NOTE: The printer comes standard with 470/1K ohm terminator resistors.
Verify host computer port termination resistor requirements. In most
cases, Dataproducts requires 220/330 ohm termination resistors.
Optional termination resistors are available from your service
provider.
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 switch on the control panel has been activated. The printer is
ready to accept data from the host.
DAT
A 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.
P
APER 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 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.
Interface Verification – Two pins on the interface connector jumpered together
allow you to verify proper installation of the interface connector.