Rockwell-automation 1770-KF2 Data Highway or Highway Plus Interface Mo Manual de usuario descargar pdf (Pagina 34)

Installation

Chapter 3

3-10

Mechanical Characteristics

The COMPUTER ASYNCHRONOUS connector on a KF2 module is a

male 25-pin D-shell. This connector conforms to the RS-232-C standard

and will accommodate any RS-232-C standard cable (see “Cabling”).

Electrical Characteristics

Selection of either RS-232-C or RS-422-A determines the input and

output levels of the transmit data and receive data circuits on the

asynchronous interface. When RS-232-C standard communication is

selected, all signals on the asynchronous interface are driven and received

by RS-232-C interface circuits which have a maximum drive capability of

50 cable-feet. When RS-422-A standard communication is selected, the

transmit and receive signals only are driven and received by RS-422-A

interface circuits which have a maximum drive capability of

4,000 cable-feet. In RS-422-A mode, all other signals except transmit and

receive still conform to RS-232-C.

The setting of Communication Option Switch 4 of Switch Group SW-1

determines whether the asynchronous port asserts the handshaking signals

or not (see “Asynchronous Link Features”). The handshaking signals are:

RTS, CTS, DSR, DCD, and DTR. When Switch 4 of SW-1 is ON, the

handshaking signals are used. When RS-422-A communications and

handshaking are both selected, handshaking signals are present; but they

conform to RS-232-C standards only.

Cabling

Cabling for the asynchronous port of the KF2 module will vary,

depending on your application and on whether you are using RS-232-C or

RS-422-A communications. The pinouts for the asynchronous connector

are as follows:

Signal Abbreviation RS-232-C RS-422-A

Protective Ground

Transmitted Data

Received Data

Request to Send

Clear to Send

Data Set Ready

Signal Ground

Data Carrier Detect

Data Terminal Ready

Transmitted Data A

Transmitted Data B

Received Data A

Received Data B

TXD

RXD

RTS

CTS

DSR

GND

DCD

DTR

TDA

TDB

RDA

RDB

1 2 ... 29 30 31 32 33 34 35 36 37 38 39 ... 234 235

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