Vision Systems VScom 200E PCIex Uživatelský manuál stáhnout pdf (Strana 6)

2 Introduction

1 Overview

The VScom Industrial PCI cards oﬀer three way serial ports, the electrical interfaces provided are

RS 232, RS 422 and RS 485 in several operation modes. The cards are designed to control industrial

hardware via asynchronous serial ports, as many software requires today. There are cards for the

modern bus of PCI Express, and also cards to place in the previous Universal PCI bus.

When used in RS 485 modes, the serial ports detect the end of transmission by hardware, so the

RS 485 driver is set in Oﬀ state. This feature is named as ART for Automatic Receive Transmit

control. If required the user may also control the the RS 485 driver by his application, using the

hardware signals RTS or DTR on some products.

The supplied drivers for Windows operating system install the serial ports into the Windows API,

so they appear as the usual Com ports software requires. A rich set of driver options is conﬁgured

via the Device Manager in Windows. The driver allows to conﬁgure the serial ports for a bitrate of

up to 921,600 bps, some models allow up to 15.6 Mbps. Of course RS 232 can not reliably transport

very high bitrates, but RS 422 and RS 485 are designed for 1 Mbps on typical length connection

cables.

2 Introduction

This manual describes the hardware conﬁguration of VScom PCI cards. PCI here especially means

all kinds of PCI buses and the VScom cards designed for those. Namely this is for the classic PCI

cards (5V signal level), Universal PCI cards (3.3V and 5V signal level, including the PCI-X bus),

as well as the PCIex cards (PCI eXpress or PCIe bus).

Also the Windows driver for these cards is described in detail.

2.1 Features

• Universal PCI (5V and 3.3V) 32 bit 33MHz

PCI Express x1

• Three way serial port interfaces: RS 232, RS 422 and RS 485

• Max 921,600 bps, half- and full-duplex

• Drivers for Windows™ operating system

2.2 Product Speciﬁcations

The family of industrial cards consists of two cards for the PCI Express bus, or PCIe x1 for short.

There are four other universal cards for the classic PCI bus slots.

All serial ports provide the option to operate with RS 232 electrical interface, as well as RS 422 and

RS 485. In RS 485 the so called direction switching is performed by a hardware automatic named

ART for Automatic Receive Transmit control. This automatic releases the transmission lines in

less than one bit time after the transmission of data has ended.

July 2011 VScom Industrial Card User Manual 6

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Vision Systems VScom 200E PCIex Uživatelský manuál Strana 6