Measurement-computing Analyzer488 Manuel d'utilisateur télécharger pdf (Page 43)

Section 2 Getting Started

2.21

View of the Analyzer488 Serial Connector

GND

-RXD

-TXD

CTS

RTS

DTR

-RxD Receive Data - Input - Pin 2

This pin accepts serial data sent by the RS-232 host. The serial

data is expected with the word length, baud rate, stop bits and

parity selected by the internal switches. The signal level is low

true.

-TxD

Transmit Data - Output - Pin 3

This pin transmits serial data to the RS-232 host. The serial data

is sent with the word length, baud rate, stop bits and parity

selected by the internal switches. The signal level is low true.

DTR

Data Terminal Ready - Ouptut - Pin 4

The

DTR

output is connected directly to + 9 volts.

Gnd

Ground - Pin 5

This pin sets the ground reference point for the other RS-232

inputs and outputs.

RTS

Request To Send - Output - Pin 7

The

RTS

output is used as a hardware handshake line to prevent

the RS-232 host from transmitting serial data if the Analyzer488 is

not ready to accept it. When

RTS/CTS

handshake is selected, the

Analyzer488 will drive the

RTS

output high when there are greater

than 1000 character locations available in its internal buffer. If the

number of available locations drops to less than 1000, the

Analyzer488 will un-assert (low) this output. If

XON/XOFF

1 2 ... 38 39 40 41 42 43 44 45 46 47 48 ... 280 281

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Measurement-computing Analyzer488 Manuel d'utilisateur Page 43

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