Printronix P3000 Series manual Chapter Interfaces, Dataproducts Parallel Interface

CHAPTER 7

INTERFACES

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 Terminating 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 Winches- ter MRAC50P connector is also available from your authorized service representative.

Dataproducts Interface Signals

Table 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 Strobe – 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.

Interfaces 7–1