Rockwell-automation 1770-KF2 Data Highway or Highway Plus Interface Mo Manual de usuario descargar pdf (Pagina 72)

Asynchronous Link Protocols

Chapter 4

4-29

Figure 4.16

Half-Duplex

Master T

ransceiver

XCVR

Select Station

Poll Selected Station

Start Timeout

Receive

No

Receive

Yes

Message

No

No

Yes

Yes

Set Active Station Flag

Get Message from

Send Message

Start Timeout

Receive

Yes

No

3

No

Tell Network Layer

Yes

Remove Station

Active

Yes

3

Yes

Duplicate

Yes

No

Create Master Message

Send DLE ACK

11698

DLE EOT

Message

OK?

Network Layer

DLE ACK

Timeouts

for this

of Failure

Station

Timeouts

for this Poll?

from Active List

Message

No

No

Network

Layer has

?

No

Yes

?

Message?

?

?

Message to

send?

Send Message

to Destination

Send to

Is Message

for Master

?

Network Layer

Yes

No

YesNo

Send Poll

Station to Poll

Is Master?

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