Allen-Bradley 2755 Manual do Utilizador descarregar pdf (Página 21)

Overview 1–13

RS-232

The RS-232 port provides point-to-point communications with a

device having an RS-232 port, such as a PLC-5 Channel 0 port or

computer.

RS-232

PLC-5

Channel 0

(Configured for RS-232)

Reader

Protocols

The RS-485/RS-422 and RS-232 serial ports support these protocols.

Protocol Description

Allen-Bradley

DF1

A peer-to-peer protocol that combines features of ANSI X3.28-1976

specification subcategories D1 (data transparency) and F1 (two-way

simultaneous transmission with embedded responses).

Allen-Bradley

DH485

A network protocol that allows DH485 devices (using the RS-485 stan-

dard) to communicate on the Allen-Bradley DH485 link.

Terminal

Provides a simple interface to most serial devices. This is the least se-

cure protocol since it does not confirm the delivery or accuracy of mes-

sages. If security is required, we recommend that you use DF1 protocol

with Block Check Characters (BCC) and ACK/NAK handshaking.

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Allen-Bradley 2755 Manual do Utilizador Página 21