Rockwell-automation 1775-KA PLC-3 Communication Adapter Module User Ma Manual do Utilizador descarregar pdf (Página 141)

Half-Duplex Protocol

Chapter 11

1114

Figure 11.5 shows a message transfer in which the BCC was invalid.

After a timeout, the message is retransmitted. After the retransmission the

response is DLE ACK.

Figure 11.5

Message

T

ransfer with Invalid BCC

Not Full

OK

xxxx

xxxx

SINK MASTER LINK SLAVE SINK

1005–I

DLE ACK

DLE STX ??? DLE ETX BCC

SOURCE/ SOURCE/

DLE SOH STN

DLE STX xxxx DLE ETX BCCDLE SOH STN

(Timeout)

1 2 ... 136 137 138 139 140 141 142 143 144 145 146 ... 238 239

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