Measurement-computing Digital232 Manual de usuario descargar pdf (Pagina 5)

Section 1 Introduction

1.1

Introduction

1.1 General Description

The

Digital232

is a digital input and output interface to the RS-232 standard. The

unit has 40 TTL level digital I/O lines, divided into five 8-bit ports. Each port is

software programmable as input or output.

The

Digital232

has several features which give it versatile interface capability. A

trigger output signal can be asserted on a Trigger command. Edge-triggered inputs

can generate a Service Request to the RS-232 host. Five data formats are software

programmable, including hexadecimal, ASCII, binary, high speed binary and decimal.

There are also individual bit set and bit clear commands.

A status mode enables the host to interrogate the programmed status of the

Digital232

at any time. A self-test is initiated at power-on which checks for proper

RAM and ROM operation.

When data is requested, the

Digital232

will output from all forty bits, all input

ports, all output ports, or from a specific 8 bit port. When being programmed, the unit

will input data and programming information from the host, and output the data to the

selected I/O port.

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Measurement-computing Digital232 Manual de usuario Pagina 5