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9 EXCEPTION RESPONSES
The exception response codes sent by the slave are shown in Table 9.1. When a slave detects one of these errors, it sends a
response message to the master consisting of slave address, function code, error code and error check fields.
E
x
c
e
t p
o i
n
R
e
s
p
o
n
s
e
E
x
c
e
t p
o i
n
R
C
o
d
e
0
1
I
e l l
g
l a
F
u
n
t c
o i
0
2
I
e l l
g
l a
D
a
a t
A
0
3
I
e l l
g
l a
D
a
a t
V
0
7
N
e
g
a
v i t
e
A
k c
0
8
M
e
m
o
y r
P
r a
y t i
9.1 Examples
A read register request to read holding register address 251 of slave 01 (undefined address for slave, beyond address limit) is
shown below.
S
a l
v
e
A
d
d
e r
s
s
F
u
n
t c
o i
0
1
0
3
The response is an exception response sighting 'illegal data address'. To indicate that the response is a notification of an error,
the most significant bit of the function code is set to 1.
S
a l
v
e
A
d
d
e r
s
s
0
1
10 MODBUS COILS AND REGISTERS
10.1 Conductivity Transmitters Models 4620/25
10.1.1 Coils
n I
p
t u
N
u
m
b
r e
R
e
a
/ d
0
1
1
R
0
1
2
R
0
1
4
R
0
1
5
R
0
1
7
R
0
5
0
/ R
12
e
s
p
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n
s
e
N
a
m
e
n
T
h
e
m
e
s s
a
d
d
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s s
T
h
e
a
d
d
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s s
a
u l
e
T
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a
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e
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n
o
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d
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m
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t n
T
h
e
u f
n
t c
o i
E
r r
r o
P
r a
y t i
c
h
e
k c
Table 9.1 Exception Response Data
n
R
e
i g
t s
r e
S
a t
t r
O
H
g i
h
0
0
F
u
n
t c
o i
n
8
3
W
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D
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c
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1
R
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2
R
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1
n I
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2
n I
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g i
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0
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2
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r r
r o
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r r
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r r
r o
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m
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R
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D
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a
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a
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a
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a
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r r
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C
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0
6
E
5
E
r r
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C
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c
k
F
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0
R
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s
p
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t n
y r
0
=
D
s i
a
b
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1
=
E
n
a
b
e l
0
=
O
.
. K
1
=
E
r r
r o
0
=
D
s i
a
b
e l
1
=
E
n
a
b
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n
. t
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c
k
F
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(
C
R
C
1 -
) 6
F
9
(
C
R
C
1 -
) 6
F
1
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