Measurement-computing Serial488A Manuel d'utilisateur télécharger pdf (Page 29)

2.19

RTS Request To Send - Output - Pin 5

The

RTS

output is used as a hardware handshake line to prevent

the RS-232/RS-422 host from transmitting serial data if the

Serial488A

is not ready to accept it. When

RTS/CTS

handshake

is selected on the internal switches, the

Serial488A

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

Serial488A

will un-assert

(low) this output. If

Xon/Xoff

handshake is selected, the

RTS

line

will be permanently driven active high.

Vtest Test Voltage - Output - Pin 6

This pin is connected to +5 volts through a 1K• resistor. It is also

common to Vtest on pin 9.

Gnd Ground - Pin 7

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

inputs and outputs.

Vtest Test Voltage - Output - Pin 9

This pin is connected to 5 volts through a 1K• resistor. It is also

common to Vtest on pin 6.

+RxD Receive Data Plus - Input - Pin 14

This pin accepts serial data sent by the 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 high

true and only connected to this pin when RS-422 operation is

selected. It is 180° out of phase with

-RxD

+TxD Transmit Data Plus - Output - Pin 16

This pin transmits serial data to the 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 high true and

only connected to this pin when RS-422 operation is selected. It is

180° out of phase with

-TxD

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Measurement-computing Serial488A Manuel d'utilisateur Page 29

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