105
CHAPTER 10 – MODBUS-RTU COMMUNICATION
CHAPTER 10 - MODBUS- RTU COMMUNICATION
10.1 Introduction
The
VFD
can
be
controlled
and
monitored
through
the
Modbus
RTU
protocol
over
an
RS
‐
485
connection.
Modbus
follows
a
simple
client
‐
server
model.
Server
devices
perform
data
read/write
requests
which
are
issued
from
a
client
device
such
as
a
PLC
or
building
management
system.
Assignable
addresses
for
server
devices
range
from
an
address
of
1
to
a
theoretical
maximum
of
247.
As
a
server
device,
the
VFD
communicates
all
data
using
only
16
‐
bit
holding
registers.
Addressing
for
the
registers
is
partitioned
into
blocks
that
are
multiples
of
100
to
group
functionally
similar
data.
If
the
drive
is
configured
to
accept
commands
via
remote
communications,
it
can
be
commanded
to
start,
stop,
run
at
a
specified
output
frequency,
target
a
setpoint
in
PID
control,
and
reset
faults.
Modbus
addresses
can
be
found
in
Chapter
7
–
Parameter
Lists
Summary of Contents for Q-link
Page 12: ...12 2 1 2 UL Label...
Page 16: ...16 3 3 VFD with Disconnect Ratings 3 4 VFD HP Rated Ratings...
Page 18: ...18 3 8 Standalone and HP Rated VFD Dimensions...
Page 19: ...19 3 9 Smart Bypass and VFD with Disconnect Dimensions...
Page 26: ...26 4 3 Wiring Schematic Standalone HP Rated VFD s...
Page 27: ...27 4 4 Wiring Schematic Smart Bypass...
Page 28: ...28 4 5 Wiring Schematic VFD with Disconnect...
Page 35: ...35 4 12 PID Control Diagram...
Page 37: ...37 5 2 Control Interface...
Page 95: ...95 ADMIN 35 Serial Number Serial Number 30 XXXXXXXX 0 99 999 999...
Page 103: ...103 9 2 Fan Replacement...
Page 104: ...104 9 3 Battery Replacement...
