Rockwell-automation 1746-BAS-T SLC 500 Basic Module/ Instructions Manual de usuario descargar pdf (Pagina 14)

14 SLC 500 BASIC and BASIC-T Modules

Publication 1746-IN009B-EN-P - August 2005

Hardware Handshaking

The module uses the following rules when hardware handshaking is enabled. The

module:

• does not transmit until CTS (Clear to Send) becomes active, and

• examines DSR (Data Set Ready) following the receipt of a character.

If DSR is active, the character is placed in the input queue. If DSR is inactive, the

character is assumed to be noise and is discarded.

DTE and DCE Overview

DTE - Data Terminal Equipment

The serial ports are configured as 9-pin Data Terminal Equipment (DTE), as are

most terminals or computer ports.

IMPORTANT

You need to know whether the device connecting to the module

has a DTE or DCE interface. Figures 8 through 12, starting on

page 16, are provided to help you make the appropriate

connection.

DTE 9

Pinout

Signal

Description

Signal from DTE

Perspective

DTE 25

Pinout

Signal

Description

Pin # Pin #

1 NC-No Connection Input 8 CD-Carrier Detect

2 RXD-Received Data Input 3

3 TXD-Transmitted Data Output 2

4 DTR-Data Terminal Ready Output 20

5 COM-Signal Common Shared 7

6 DSR-Data Set Ready Input 6

7 RTS-Request to Send Output 4

8 CTS-Clear to Send Input 5

9 NC-No Connection Input 22 RI-Ring Indicator

1 2 ... 9 10 11 12 13 14 15 16 17 18 19 ... 27 28

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Rockwell-automation 1746-BAS-T SLC 500 Basic Module/ Instructions Manual de usuario Pagina 14