Despatch Protocol Plus Modbus Communications User Manual
Page 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
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