Measurement-computing Micro 488/EX rev.2.1 Uživatelský manuál stáhnout pdf (Strana 29)

Section 2 Getting Started

2.15

-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

Micro488/EX 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 Micro488/EX 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 Micro488/EX. If

XON/XOFF

handshake is selected, the

CTS

line

is not tested to determine if it can transmit data.

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 Micro488/EX

is not ready to accept it. When

RTS/CTS

handshake is selected on

the internal switches, the Micro488/EX 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 Micro488/EX 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

Ω

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.

1 2 ... 24 25 26 27 28 29 30 31 32 33 34 ... 217 218

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