Measurement-computing Serial488A Manual de usuario descargar pdf (Pagina 28)

2.18

Rear View of the Serial488A's Serial Connector

-RXD

-TXD

CTS

RTS

+TXD

+RXD

+VTEST

GND

-RxD Receive Data - Input - Pin 2

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

CTS Clear To Send - Input - Pin 4

The

CTS

input is used as a hardware handshake line to prevent the

Serial488A

from transmitting serial data when the RS-232 host is

not ready to accept it. When

RTS/CTS

handshake is selected on

the internal switches, the

Serial488A

will not transmit data out

TxD

while this line is un-asserted (low). If the RS-232 host is not

capable of driving this line it can be connected to the

Vtest

output

(Pin 6) of the

Serial488A

. If

Xon/Xoff

handshake is selected, the

CTS

line is not tested to determine if it can transmit data.

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Measurement-computing Serial488A Manual de usuario Pagina 28

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