Sensoray 425 Manual de usuario descargar pdf (Pagina 4)

Sensoray Model 425 Instruction Manual Page 2

Introduction

Block Diagram

The Sensoray model 425 is an ISAbus I/O card that

performs several functions commonly required in

embedded applications. On-board peripherals include:

• Programmable watchdog timer.

• 48 digital I/O channels. 16 channels have edge detection

and interrupt capability.

• 12-bit analog-to-digital converter with eight differential

input channels and resistor-programmed gain.

• Four 12-bit analog output channels.

• Three 24-bit counters optimized for interface to

incremental encoders.

The 425 is powered from the ISAbus 5-volt supply. No

auxiliary 12- or 15-volt supplies are required. Power

for linear circuitry is derived from an on-board DC-to-

DC converter. Low power CMOS circuitry is used

extensively to minimize power consumption and

enhance reliability.

The board occupies a 64-byte block of I/O addresses in

the ISAbus 16-bit I/O space. Programming shunts may

be installed to map the board to any 64-byte address

boundary.

Four headers are provided for connecting on-board

peripherals to external circuitry. Low profile vertical

headers are used to satisfy the tight clearances

mandated by modern high-density system designs.

8-channel

Diff Mux

LOCAL BUS

ISA BUS

Digital I/O

Interface

3 x 24-bit

Counters

Signal

Conditioning

System Bus

Decode

System

Data Bus

Buffer

12-bit D/A

12-bit A/D

Instrument

Amplifier

Watchdog

Timer

DC-to-DC

Converter

Analog I/O

Connector

Digital I/O

Connectors

Encoder

Connector

System

Interrupt

Control

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