Despatch Protocol Plus Modbus Communications Manual de usuario descargar pdf (Pagina 38)

Chromalox Instruments and Controls

A-51643 Rev. 6 10/06/03 32

Query

Response

Field Name

Data

Field Name

Data

Slave address

$09

Slave address

$09

Function

$08

Function

$08

Sub-function hi

$00

Sub-function hi

$00

Sub-function lo

$0C

Sub-function lo

$0C

Data hi

$00

Data hi

$00

Data lo

$00

Data lo

$07

CRC

$----

CRC

$----

5.3.1.7 [08 13] Return Bus Exception Error Count

The response data field returns the quantity of Modbus exception responses returned by the slave since its

last reset or clear counters command. For a description of exception responses see 5.4 Exception

Response Description.

Example: Return bus exception count in slave device 3.

Query

Response

Field Name

Data

Field Name

Data

Slave address

$03

Slave address

$03

Function

$08

Function

$08

Sub-function hi

$00

Sub-function hi

$00

Sub-function lo

$0D

Sub-function lo

$0D

Data hi

$00

Data hi

$00

Data lo

$00

Data lo

$02

CRC

$----

CRC

$----

5.3.1.8 [08 14] Return Slave Message Count

The response data field returns the quantity of messages addressed to the slave, or broadcast, that the

slave has successfully processed since its last reset or clear counters command.

Example: Return slave message count in slave device 5.

Query

Response

Field Name

Data

Field Name

Data

Slave address

$05

Slave address

$05

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