Measurement-computing Serial488/4 Manuel d'utilisateur télécharger pdf (Page 29)

Section 2 Getting Started

2.17

TxD- Transmit Data (output)

This pin transmits serial data to an RS-232 or RS-422 device. The

serial data received is sent with the word length, baud rate, stop

bits, and parity configured for the particular port. This signal is

low true.

TxD+ Transmit Data (output)

This pin transmits serial data to an RS-422 device. The pin

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

This signal is high true.

CTS+ Clear To Send (input) / 16 x Baud Clock (input)

The

CTS+

input is used as a hardware handshake line to prevent

the Serial488/4 from transmitting serial data to an RS-232 or RS-

422 device w hen it is not able to accept it. When

RTS/CTS

handshaking is selected using the (

) command, the Serial488/4

will not transmit data out

TxD+

while this signal is un-asserted

(low). If

XON/XOFF

(

) or no handshaking (

) is selected,

the

CTS+

line is ignored when transmitting data.

XON/XOFF

(

) or no handshaking (

) is selected the

CTS

line may be used to input a clock signal which is sixteen times the

desired baud rate. T his mode is selected using the Baud Rate

command (

B11

CTS- Clear To Send (input) / 16 x Baud Clock (input)

The

CTS-

input is used as a hardware handshake line with RS-422

devices. The pin functions identically to

CTS+

except that its

polarity is inverted. This signal is low true.

RTS+ Request To Send (output) / 16 x Baud Clock (output)

The

RTS+

output is used as a hardware handshake line to prevent

an RS-232 device from transmitting serial data to the Serial488/4

when it is not able to accept it. When automatic

RTS/CTS

handshaking is selected using the (

) and (

) commands, the

Serial488/4 will assert (high) the

RTS+

signal when greater than

1 2 ... 24 25 26 27 28 29 30 31 32 33 34 ... 90 91

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Measurement-computing Serial488/4 Manuel d'utilisateur Page 29

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