Rockwell-automation 1770, D17706.5.16 Ref Mnl DF1 Protocol Command Manual do Utilizador descarregar pdf (Página 55)

Chapter 4

Publication

17706.5.16 - October 1996

Using Fullduplex Protocol to

Send and Receive Messages

In full-duplex protocol, devices share the same data circuits, and

both devices can “talk” at the same time. Full-duplex protocol can

be likened to a two-lane bridge: traffic can travel in both directions

at one time. (To compare full-duplex to half-duplex protocol, refer

to Chapter 3, “Using Half-duplex Protocols to Send and Receive

Messages.”)

Read this chapter to help learn how to use full-duplex protocol to

send and receive messages. It contains these sections:

Section Page

Fullduplex Protocol Message Transmission 4-2

Fullduplex Protocol Environment 4-3

Message Characteristics 4-4

Transmitter and Receiver Message Transfer 4-4

Fullduplex Protocol Diagrams

4-10

Link arbitration

You can use these Allen-Bradley interface modules to automatically

handle the link arbitration:

•1747KE •1771KE •1775KA (via modem port)

•1770KF2 •1771KF •1785KE

•1770KF3 •1771KG •5130RM1 (channel one)

•1770KFC •5130KA •5130RM2

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Rockwell-automation 1770, D17706.5.16 Ref Mnl DF1 Protocol Command Manual do Utilizador Página 55