HP LQH-HW 3ULQWHUV User Manual Page 243

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Centronics Parallel Interface Configuration
243
Data Strobe. Carries a low true, 100 ns min. pulse from the host that clocks
data into the printer.
Paper Instruction (PI). Carries a VFU control signal from the host with the
same timing as the data lines.
Acknowledge. A low true pulse from the printer indicating the character or
function code has been received and the printer is ready for the next data
transfer.
Online. A high true level from the printer to indicate the printer is ready for
data transfer and the ON LINE key on the operator panel has been activated.
When the printer is in online mode, it may accept data from the host.
Paper Empty (PE). A high true level from the printer to indicate the printer is
in a fault condition.
Busy. A high true level from the printer to indicate the printer cannot receive
data.
Centronics Parallel Interface Configuration
Your printer is configured at the factory to match the interface you specified.
By using the operator panel, you may verify and change several interface
parameters in order to meet specific application requirements.
Refer to “Centronics (Parallel) Submenu” on page 112 for Centronics
parameter descriptions and information on selecting values for the following
parameters:
Data Bit 8 (enable or disable)
Data Polarity (standard or inverted)
Strobe Polarity (standard or inverted)
Response Polarity (standard or inverted)
Busy on Strobe (enable or disable)
Latch Data On Leading or Trailing Edge of Strobe
Prime Signal (enable or disable)
TOF Action at Prime Signal (do nothing or form feed)
I/O Buffer Size (1-6)
Some application programs require a unique configuration. If the printer is not
working properly in the configuration you have selected, contact a Hewlett-
Packard Customer Service Engineer.
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