Despatch Protocol Plus Modbus Communications User Manual
Page 39
Chromalox Instruments and Controls
A-51643 Rev. 6 10/06/03
33
Function
$08
Function
$08
Sub-function hi
$00
Sub-function hi
$00
Sub-function lo
$0E
Sub-function lo
$0E
Data hi
$00
Data hi
$00
Data lo
$00
Data lo
$6C
CRC
$----
CRC
$----
5.3.1.9 [08 15] Return Slave No Response Count
The response data field returns the quantity of messages addressed to the slave for which it returned no
response since its last reset or clear counters command. No response due to errors are not counted.
Example: Return slave no response count in slave device 9.
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
$0F
Sub-function lo
$0F
Data hi
$00
Data hi
$00
Data lo
$00
Data lo
$02
CRC
$----
CRC
$----
5.3.1.10 [08 18] Return Bus Character Overrun Count
The response data field returns the quantity of messages addressed to the slave that it could not handle
because of communication port overrun, framing errors, or parity errors since its reset or clear counters
command.
Example: Return bus character overrun count in slave device 1.
Query
Response
Field Name
Data
Field Name
Data
Slave address
$01
Slave address
$01
Function
$08
Function
$08
Sub-function hi
$00
Sub-function hi
$00
Sub-function lo
$12
Sub-function lo
$12