Advantech PCI-1757UP Spezifikationen PDF herunterladen (Seite 7)

Chapter 1 General Information 3

1.1 Introduction

The PCI-1757UP is a 24-bit DI/O card with PCI bus. It provides you

with 24 bits of parallel digital input/output, and emulates mode 0 of the

8255 PPI chip, but the buffered circuits offer a higher driving capability

than the 8255.

The card emulates one 8255 PPI chips to provide 24 DI/O bits. The I/O

bits are divided into three 8-bit I/O ports: A0, B0 and C0. You can

configure each port as either input or output via software. The dual

interrupt handling capability provides users the flexibility to generate

interrupts to a PC. A pin in the connector can output a digital signal

simultaneously with the card's generating an interrupt.

This card uses a DB 25-pin connector for easy and reliable connections

to field devices.

One feature gives the PCI-1757UP practical advantage in an industrial

setting. When the system is hot reset (the power is not turned off) the

PCI-1757UP retains the last I/O port settings and output values if the

user has set jumper JP1 to enable this feature. Otherwise, port settings

and output values reset to their safe default state, or to the state

determined by other jumper settings.

Numbering Convention

All numbers given in this manual are in decimal format unless

specifically noted otherwise. In particular, where a register address is

given as (Base + 32), the decimal number "32" should be added to the

base value.

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Advantech PCI-1757UP Spezifikationen Seite 7