Measurement-computing Serial488/4 Uživatelský manuál stáhnout pdf (Strana 28)

Section 1 Introduction

2.16

option (

) is normally used. T his option w ill cause the Serial488/4 to

send

XOFF

and

XON

control characters depending on the amount of

memory available for receiving serial data. The manual handshake control

options (

and

) may be used in special circumstances to send

XOFF

and

XON

characters under program control if desired.

The clock output handshake control option (

) operates the same as

the automatic handshake option, but will also cause the serial baud clock x

16 signal to be output on the

RTS

line.

In addition to softw are and hardw are handshaking the Serial488/4

provides a No Handshaking mode w hich may be used in special

circumstances where handshaking is not desired. This mode is selected by

using the

command. In the no handshake mode the

RTS

line may be

manually un-asserted or asserted using the

and

handshake

control commands, or the serial baud clock x 16 may be output on the

RTS

line if the

command is used.

2.5.4 Serial Signal Descriptions

The Serial488/4 is equipped w ith four DB-9S connectors on its rear

panel and requires DB-9P mating connectors. The Serial488/4's connector

is configured as an IBM A T when RS-232 levels are selected and

Macintosh II/SE/Plus when RS-422 levels are selected. Tables 2.2 and 2.3

list the RS-232 and RS-422 pin connections. E ach of these signals are

described below.

RxD- Receive Data (input)

This pin accepts serial data sent by an RS-232 or RS-422 device.

The serial data received is expected to match the word length,

baud rate, stop bits, and parity configuration of the particular port.

This signal is low true.

RxD+ Receive Data (input)

This pin accepts serial data sent by an RS-422 device. It

functions identically to RxD - except that its polarity is inverted.

This signal is high true.

1 2 ... 23 24 25 26 27 28 29 30 31 32 33 ... 90 91

Komentáře k této Příručce

Žádné komentáře

Measurement-computing Serial488/4 Uživatelský manuál Strana 28

Komentáře k této Příručce

Související produkty a manuály pro Hardware Measurement-computing Serial488/4