IPES-IR/UV Flame Detector
80010-001 R07
Operating Manual
Page 28 of 29
Revised 10/21/2013
Appendix
B:
IPES
Digital
Communications
Protocol
IPES
Commands
In
addition
to
supporting
analog
signals
(current
loop
and
relays),
IPES
‐
IR/UV
flame
detectors
are
also
capable
of
digital
communications
with
remote
consoles.
IPES
‐
IR/UV
detectors
use
a
standard
RS
‐
485
interface
with
a
Modbus
RTU
protocol
layer
defining
the
transactions
between
the
IPES
‐
IR/UV
and
the
console.
Refer
to
the
document
“MODBUS
APPLICATION
PROTOCOL
SPECIFICATION
v1.1b”
available
online
at
www.modbus.org
for
complete
details
of
the
Modbus
protocol.
Setting
Address/
Baud
Rate
Command
The
factory
default
Modbus
address
for
the
IPES
‐
IR/UV
is
247.
The
factory
default
baud
rate
for
each
detector
is
9600.
The
following
8
‐
byte
Modbus
command
must
be
sent
to
the
IPES
‐
IR/UV
in
order
for
the
Modbus
address
and
baud
rate
to
be
changed:
Set
address/baud
rate
command
Byte
Description
0
Current
Modbus
address
(247
if
IPES
‐
IR/UV
set
to
factory
default)
1
6
(Modbus
function
code
for
writing
to
the
device)
2
0
3
0
4
New
Modbus
address
(must
be
in
the
range
1
to
247)
5
New
baud
rate
(must
be
one
of
the
following
values):
1
–
1200
baud
2
–
2400
baud
4
–
4800
baud
8
–
9600
baud
16
–
19200
baud
6
Low
byte
of
16
‐
bit
CRC
7
High
byte
of
16
‐
bit
CRC
The
Modbus
address
and
baud
rate
are
stored
in
non
‐
volatile
memory
with
a
write
endurance
of
10000
erase
‐
write
cycles.
Repeated
transmission
of
the
set
address/baud
rate
command
to
the
IPES
‐
IR/UV
detector
can
potentially
degrade
the
memory
beyond
its
ability
to
retain
the
data
being
written
to
it.
The
address
and
baud
rate
should
be
changed
only
when
necessary
to
connect
the
IPES
‐
IR/UV
detector
to
a
remote
console.
The
IPES
‐
IR/UV
will
respond
to
the
host
by
transmitting
an
identical
packet
to
the
host
at
the
original
baud
that
was
used
to
receive
the
command.
After
the
response
has
been
transmitted,
the
IPES
‐
IR/UV
will
change
its
Modbus
address
and
baud
rate
to
the
ones
specified
in
the
command.
At
that
point,
the
remote
console
must
change
its
baud
rate
in
order
to
communicate
further
with
the
detector.
The
new
Modbus
address
and
baud
rate
are
stored
in
non
‐
volatile
memory
and
these
parameters
will
be
retained
through
power
cycles.
Summary of Contents for IPES-IR/UV
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