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Page 2 Sensoray Model 421 Instruction Manual

Introduction

Block Diagram

Power for linear circuitry is derived from an on-

board DC-to-DC converter. Wherever possible, low

power CMOS circuitry is used to minimize system

power consumption and enhance reliability.

The board occupies a 32-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 32-byte

address boundary.

Four headers are provided for connecting on-board

peripherals to external circuitry. Right-angle headers

are used to satisfy the tight clearances mandated by

modern high-density system designs. All headers are

supplied with latches to ensure reliable operation in

vibrating environments.

The Sensoray model 421 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.

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

input channels and resistor-programmed gain.

— Four 12-bit analog output channels.

— Three 16-bit counter channels optimized for interface to

incremental encoders.

The 421 is powered from the ISAbus 5-volt supply.

No auxilliary 12- or 15-volt supplies are required.

8-channel

Diff Mux

LOCAL BUS

ISA BUS

Digital I/O

Interface

3 x 16-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

1 2 3 4 5 6 7 8 9 ... 26 27

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