
31
2
SV reading (Address 1)
• Request message from the master
The number of data indicates the data item to be read, and it is fixed as 1 (0001H).
(Fig.
8.2.3-4)
• Response message from the slave in normal status [SV=600 (0258H)]
The number of response bytes indicates number of bytes of the data which has
been read, and it is fixed as (02H).
(Fig.
8.2.3-5)
• Response message from the slave in exception (error) status (When
non-existent data address is sent)
The function code MSB is set to 1 for the response message in exception (error)
status (83H).
If an exception code (02H: Non-existent data address) is returned, the error can
be determined by reading this code.
(Fig.
8.2.3-6)
3
When SV is set to 600 (0258H) (Address 1)
• Request message from the master
(Fig.
8.2.3-7)
• Response message from the slave in normal status
(Fig.
8.2.3-8)
• Response message from the slave in exception (error) status (When a value out
of the setting range is set)
The function code MSB is set to 1 for the response message in exception (error)
status (86H).
If an exception code (03H: Value out of the setting range) is returned, the error
can be determined by reading this code.
(Fig.
8.2.3-9)
3.5 idle
characters
Slave
address
Function
code
Exception
code
Error check
CRC
3.5 idle
characters
(01H)
(86H)
(03H)
(0261H)
1
1
1
2
Number of
characters
3.5 idle
characters
Slave
address
Function
code
Data item
Error check
CRC
3.5 idle
characters
(01H)
(03H)
(0001H)
Number of
data
(0001H)
(D5CAH)
1
1
2
2
2
Number of
characters
3.5 idle
characters
Slave
address
Function
code
Exception
code
Error check
CRC
3.5 idle
characters
(01H)
(83H)
(02H)
(C0F1H)
1
1
1
2
Number of
characters
3.5 idle
characters
Slave
address
Function
code
Number of
response bytes
Error check
CRC
3.5 idle
characters
(01H)
(03H)
(02H)
Data
(0258H)
(B8DEH)
1
1
1
2
2
Number of
characters
3.5 idle
characters
Slave
address
Function
code
Data
item
3.5 idle
characters
(01H)
(06H)
(0001H)
1
1
2
2
Number of
characters
Data
2
Error check
CRC
(DB90H)
(0258H)
3.5 idle
characters
Slave
address
Function
code
Data
item
3.5 idle
characters
(01H)
(06H)
(0001H)
1
1
2
2
Number of
characters
Data
2
Error check
CRC
(DB90H)
(0258H)