7–1Interfaces
CHAPTER 7INTERFACES
Introduction
The
P3000 Series printers are equipped with resident parallel and serial interfaces. Only one interface
can be enabled at a time via the control panel. Only one parallel host can be connected at any time.
Other optional interfaces include an Intelligent Graphics Processor (IGP), PI–3287, and PI–5225.
Contact your authorized service representative for details.
This chapter describes:
•Dataproducts Parallel Interface Page 7–1. . . . . . . . . . . . . . . . . . . . . . . .
•Centronics Parallel Interface Page 7–3. . . . . . . . . . . . . . . . . . . . . . . . . .
•Alternate T
erminating Resistors
Page 7–5. . . . . . . . . . . . . . . . . . . . . . . .
•RS–232 Serial Interface Page 7–10. . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Dataproducts Parallel Interface

This
interface allows the printer to
operate with controllers designed for Dataproducts printers using a
50–pin
AMP Ampilite HDH–20 type connector
. The maximum data line length (cable length) from
the
controller (host computer) to the printer is 40 feet. An adapter cable to accept the 50–pin W
inches-
ter MRAC50P connector is also available from your authorized service representative.

Dataproducts Interface Signals

T
able 7–1
lists the Dataproducts
interface connector pin assignments. Dataproducts compatible inter
-
face signals between the computer and the printer are defined as follows:
Ready
Line
– 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.
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.
Data
Request
– A high true signal from the printer indicating 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.
Data
Str
obe
– A high true pulse from the host indicating 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 for either
leading (default) or trailing.
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.