Rockwell-automation 1770-KF2 Data Highway or Highway Plus Interface Mo Manual de usuario descargar pdf (Pagina 50)

Asynchronous Link Protocols

Chapter 4

4-7

To implement all of these data paths with only two physical circuits, a

software multiplexer combines the message codes with the response codes

going in the same direction. At the other end of the link a software

separator divides the message codes from the response codes. The

message codes are sent to the receiver, and the response codes are sent to

the transmitter via internal software. On each physical circuit, response

codes from a receiver to a transmitter will be seen intermingled with

message codes being sent from a transmitter to a receiver. Figure 4.3

shows this implementation.

Figure 4.3

Software

Implementation of Data Paths

Transmitter

A

Receiver

B

S

M

M

S

Receiver

A

Transmitter

B

M

S = Software Separator

= Software Multiplexer

Path 2

Path 3

Path 1

Path 4

Path 2

Path 3

Path 1

Path 4

11557

Physical Circuit AB

Physical Circuit BA

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