Rockwell-automation 1775-KA PLC-3 Communication Adapter Module User Ma Manual do Utilizador descarregar pdf (Página 147)

100

101

Half-Duplex Protocol

Chapter 11

1120

When monitoring half–duplex protocol on a two–wire link, you need to

monitor only one line. the example below shows a message sent by the

master and a reply sent by the slave in answer to a poll. Slave responses

are in bold.

Message from master to slave:

DLE SOH STN DLE STX xxxx DLE ETX BCC DLE ACK

Message sent from slave to master in answer to poll:

DLE ENQ STN BCC DLE STX xxxx DLE ETX BCC DLE ACK

Poll with a DLE EOT answer:

DLE ENQ STN BCC DLE EOT

Line Monitoring

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