Rockwell-automation 1770-KF2 Data Highway or Highway Plus Interface Mo Bedienungsanleitung PDF herunterladen (Seite 223)

Detailed Flowcharts

Appendix D

D19

Figure D.24

Receiver Routine for FullDuplex Protocol

RCVE

Reset Buffer Flag: Set

Header to Illegal Value

GET BUFFER

Get a Buffer

LAST = NAK

Reset Receiver Error Flag

GET CODE

Get Next Input

Control

Code

DLE ENQ

DLE STX

XMSG

Transfer Message to

Network Layer

Ignore

Flag (0)

Save Response (ACK or

NAK) in LAST

SEND CTL

Transmit

LAST

Yes

NOTE: XMSG Returns ACK,

NAK, or 0 (for Ignored Message)

Variables

• LAST: Value of Last Response

• HEADER: DST, SRC, CMD, STS

and TNS from Last Message

• BUFFER: Whether an Empty Buffer Is Read

• Receiver Error Flag

11654

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