ST20-PPI PC Parallel Port to OS-Link Interface

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1

Introduction

The ST20-PPI parallel port to OS-Link interface is a host interface to allow connection

from a PC parallel port to any OS-Link based ST20 development board such as the

ST20450-SAB. The interface plugs into any standard PC 25 way D-type parallel port.

Supported parallel port modes are:

•

Nibble mode

•

Byte mode

•

EPP mode

depending on which mode the host PC can support. Connection to the development

target is via a differential OS-Link connector, as used on the IMS B300 and ST20450-

Development Board. Once connected, the development target can be accessed with

the standard ST20 Toolset using the MS Windows drivers supplied.

2

Installation

2.1

Hardware Installation

The ST20-PPI has three connections: Parallel port; Differential OS-Link and Power

supply. To install the hardware, the following steps should be followed:

•

Plug the 25-way D-type of the parallel port cable built into the interface, into the

parallel port of the PC

•

Plug the target development system into the 26-way D-type using a differential

OS-Link cable or the differential-to-single ended cable depending on the link

interface available on the target board

NOTE: To comply with EMC regulations this cable must use shielded cable

with shielded headshells at either end.

•

Plug power supply cable into PSU socket of the interface

•

Plug the power supply into the mains socket.

•

Switch on the PC

•

Switch on the power supply. The power LED on the interface should illuminate

when the power supply is switched on