B - df1 diagnostic command support, Df1 diagnostic command support – Rockwell Automation 1770-HT8 SMART TRANSMITTER User Manual

Page 115

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Appendix

B

B-1

DF1 Diagnostic Command Support

The information in this appendix deals only with RS-232C DF1
communications, between the host processor and the Communications
Controller.

The Communications Controller interprets and responds to the following
diagnostic commands from the host processor:

Table B.A

Communications Controller Diagnostic Commands

Description

Command Byte

Function Code (hex)

ББББББББ

ББББББББ

Diagnostic Loop

БББББББББ

БББББББББ

06

ББББББББ

ББББББББ

00

ББББББББ

ББББББББ

Diagnostic Read Counters

БББББББББ

БББББББББ

06

ББББББББ

ББББББББ

01

ББББББББ

ББББББББ

Diagnostic Status

БББББББББ

БББББББББ

06

ББББББББ

ББББББББ

03

ББББББББ

ББББББББ

Reset Diagnostic Counters

БББББББББ

БББББББББ

06

ББББББББ

ББББББББ

07

Diagnostic Loop

You can use this command to check the integrity of the transmissions over
the communication link. The command message transmits up to 243 bytes
of data to a node interface module. The receiving module should reply to
this command by transmitting the same data back to the originating node.

Figure B.1

Diagnostic Loop Command Format

1 byte

1 byte

2 bytes

1 byte

243 bytes max

БББББ

БББББ

CMD

06

БББББ

БББББ

STS

БББББ

БББББ

TNS

БББББ

БББББ

FNC

00

БББББ

БББББ

DATA

Figure B.2

Diagnostic Loop Reply Format

1 byte

1 byte

2 bytes

243 bytes max

БББББББ

Б

БББББ

Б

БББББББ

CMD

46

ББББББ

Б

ББББ

Б

ББББББ

STS

ББББББ

Б

ББББ

Б

ББББББ

TNS

БББББББ

Б

БББББ

Б

БББББББ

DATA

Diagnostic Command Support

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