Omron SYSDRIVE 3G3MV - Page 213

7-19
·The DSR message or normal response for loop-back test use is divided into 8-byte
blocks as shown below.Anydata can be setas testdata1or 2 provided thatthe num-
ber of data items remains changed.
·This command is used for checking the status of communications or for dummy com-
munications without detecting any communications time-over.
D DSR Message
Byte No. Data
1 Slave address
2 Function code (08 Hex)
3
Test data 1
4
T
e
s
t
d
a
t
a
1
5
Test data 2
6
T
e
s
t
d
a
t
a
2
7
CRC-16 check
8
C
R
C
-
1
6
c
h
e
c
k
D Response
Normal
Byte No. Data
1 Slave address
2 Function code (08 Hex)
3
Test data 1
4
T
e
s
t
d
a
t
a
1
5
Test data 2
6
T
e
s
t
d
a
t
a
2
7
CRC-16 check
8
C
R
C
-
1
6
c
h
e
c
k
Error
Byte No. Data
1 Slave address
2 Function code (88 Hex)
3 Error code
4
CRC-16 check
5
C
R
C
-
1
6
c
h
e
c
k
Note When an error occurs, the MSB of the function code will be set to 1.
Communications Chapter 7