Q5:
How
to
read
the
status
of
each
connection?
A5:
The
status
for
each
connection
is
saved
in
the
sequence
of
polling
definition
from
local
register
address
39600.
The
maximum
number
of
polling
definition
in
the
config.csv
file
is
240,
so
the
available
address
for
the
connection
status
is
from
39600
to
39839.
A
Modbus
master
use
function
code
04
to
read
the
status,
up
to
126
register
of
status
can
be
read
in
one
command.
Copyright
©
2014
ICP
DAS
Co.,
Ltd.
All
Rights
Reserved.
∗
E
‐
mail:
‐
33
‐
For
example,
the
status
of
the
graph
shown
above
is
presented
as
the
third
column
in
the
following
table.
Def.
number
Address
Status
Status
display
on
web
page
Def.#001
39600
0
GOOD
Def.#002
39601
0
GOOD
Def.#003
39602
0xFFFF
TIMEOUT
Def.#004
39603
0x8201
ERROR:
ILLEGAL
FUNCTION
Def.#005
39604
0
GOOD
Def.#006
39605
0x8402
ERROR:
ILLEGAL
DATA
ADDRESS
The
value
of
status:
0
:
Good
0xFFFF
:
Timeout
0x8
X
YY
:
Exception
Rresponse.
X
‐
Modbus
Function
Code.
YY
‐
Exception
Code.
Exception
Code
Name
Meaning
01
Illegal
Function
The
function
code
received
is
not
an
allowable
action.
02
Illegal
Data
Address
The
data
address
received
in
the
query
is
not
an
allowable
address.
03
Illegal
Data
Value
A
value
contained
in
the
query
data
field
is
not
an
allowable
value.
04
Illegal
response
length
The
request
would
generate
a
response
with
size
bigger
than
that
available
for
MODBUS
protocol.
