Measurement-computing Micro 488/EX rev.2.1 Manuel d'utilisateur télécharger pdf (Page 30)

Section 2 Getting Started

2.16

Vtest

Test Voltage - Output - Pin 9

This pin is connected to 5 volts through a 1K

Ω

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

2.8.3 Serial Cable Wiring Diagrams

If a cable was not purchased with the interface, the following diagrams

will be helpful in making your own cable. Simple soldering skills and an

attention to detail will ensure successful construction.

Macintosh to Micro488/EX Wiring Diagram (RS-422)

CTS

RTS

-RxD

Gnd

-Txd

CTS

RTS

-RxD

Gnd

-TxD

DB-9 Male DB-25 Male

Macintosh to Micro488/EX

4 14 +Rxd

+TxD

8 16 +Txd

+RxD

1 2 ... 25 26 27 28 29 30 31 32 33 34 35 ... 217 218

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Measurement-computing Micro 488/EX rev.2.1 Manuel d'utilisateur Page 30

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