Q4:
How
to
write
data
to
output
channels
on
a
Modbus
RTU
slave
device?
A4:
Step
1:
Edit
the
polling
definition
for
the
output
channels
with
read
function
code
in
the
config.csv
file.
(For
example,
use
01
to
read
DO
channels,
03
to
read
AO
channels)
UseComPort
SlaveModbusID
FunctionCode RegStartAddr RegCount
1
1
1
0
8
1
1
2
0
8
2
1
1
0
4
2
2
2
0
4
2
3
3
0
4
2
4
4
0
4
Step
2:
Import
the
config.csv
file
into
the
MDC
‐
700,
wait
the
MDC
‐
700
reboot
in
5
seconds,
and
then
check
the
addresses
for
the
local
registers
mapped
to
the
output
channels.
Step
3:
Write
data
with
corresponding
function
code
(05/06/15/16)
on
your
Modbus
master
device
to
the
local
registers
mapped
for
the
output
channels,
the
MDC
‐
700
will
process
writing
operations
to
the
slave
devices.
Copyright
©
2014
ICP
DAS
Co.,
Ltd.
All
Rights
Reserved.
∗
E
‐
mail:
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32
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