10
b.
RS
‐
485
Communication
Settings
The
RS
‐
485
configuration
switches
are
located
on
the
top
right
corner
of
the
main
board
as
illustrated
in
Figure
6.
These
are
used
to
set
the
instrument
address,
baud
rate,
communication
protocol,
and
to
enable
the
termination
resistor.
Table
3
gives
the
switch
settings
for
each
of
these
parameters,
and
they
are
explained
in
more
detail
below.
Switch
2
Device
Address
Position
3
4
5
6
7
1
Off (
↓
)
Off (
↓
)
Off (
↓
)
Off (
↓
)
Off (
↓
)
2
On (
↑
)
Off (
↓
)
Off (
↓
)
Off (
↓
)
Off (
↓
)
3
Off (
↓
)
On (
↑
)
Off (
↓
)
Off (
↓
)
Off (
↓
)
4
On (
↑
)
On (
↑
)
Off (
↓
)
Off (
↓
)
Off (
↓
)
5
Off (
↓
)
Off (
↓
)
On (
↑
)
Off (
↓
)
Off (
↓
)
Baud
Rate
Position
6
On (
↑
)
Off (
↓
)
On (
↑
)
Off (
↓
)
Off (
↓
)
1
2
7
Off (
↓
)
On (
↑
)
On (
↑
)
Off (
↓
)
Off (
↓
)
2400
On (
↑
)
On (
↑
)
8
On (
↑
)
On (
↑
)
On (
↑
)
Off (
↓
)
Off (
↓
)
4800
Off (
↓
)
On (
↑
)
9
Off (
↓
)
Off (
↓
)
Off (
↓
)
On (
↑
)
Off (
↓
)
9600
On (
↑
)
Off (
↓
)
10
On (
↑
)
Off (
↓
)
Off (
↓
)
On (
↑
)
Off (
↓
)
19200
Off (
↓
)
Off (
↓
)
11
Off (
↓
)
On (
↑
)
Off (
↓
)
On (
↑
)
Off (
↓
)
12
On (
↑
)
On (
↑
)
Off (
↓
)
On (
↑
)
Off (
↓
)
Communication
Protocol
Position
13
Off (
↓
)
Off (
↓
)
On (
↑
)
On (
↑
)
Off (
↓
)
8
14
On (
↑
)
Off (
↓
)
On (
↑
)
On (
↑
)
Off (
↓
)
ASCII
On (
↑
)
15
Off (
↓
)
On (
↑
)
On (
↑
)
On (
↑
)
Off (
↓
)
RTU
Off (
↓
)
16
On (
↑
)
On (
↑
)
On (
↑
)
On (
↑
)
Off (
↓
)
17
Off (
↓
)
Off (
↓
)
Off (
↓
)
Off (
↓
)
On (
↑
)
Termination
Resistor
Position
18
On (
↑
)
Off (
↓
)
Off (
↓
)
Off (
↓
)
On (
↑
)
10
19
Off (
↓
)
On (
↑
)
Off (
↓
)
Off (
↓
)
On (
↑
)
Active
On (
↑
)
20
On (
↑
)
On (
↑
)
Off (
↓
)
Off (
↓
)
On (
↑
)
Inactive
Off (
↓
)
21
Off (
↓
)
Off (
↓
)
On (
↑
)
Off (
↓
)
On (
↑
)
22
On (
↑
)
Off (
↓
)
On (
↑
)
Off (
↓
)
On (
↑
)
Reserved
Position
23
Off (
↓
)
On (
↑
)
On (
↑
)
Off (
↓
)
On (
↑
)
9
24
On (
↑
)
On (
↑
)
On (
↑
)
Off (
↓
)
On (
↑
)
Not
Used
N/A
25
Off (
↓
)
Off (
↓
)
Off (
↓
)
On (
↑
)
On (
↑
)
26
On (
↑
)
Off (
↓
)
Off (
↓
)
On (
↑
)
On (
↑
)
27
Off (
↓
)
On (
↑
)
Off (
↓
)
On (
↑
)
On (
↑
)
28
On (
↑
)
On (
↑
)
Off (
↓
)
On (
↑
)
On (
↑
)
29
Off (
↓
)
Off (
↓
)
On (
↑
)
On (
↑
)
On (
↑
)
30
On (
↑
)
Off (
↓
)
On (
↑
)
On (
↑
)
On (
↑
)
31
Off (
↓
)
On (
↑
)
On (
↑
)
On (
↑
)
On (
↑
)
32
On (
↑
)
On (
↑
)
On (
↑
)
On (
↑
)
On (
↑
)
Table
3.
RS
‐
485
Configuration
Switch
Settings