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In order to correctly transfer data, the controllers on the RS485 bus must be connected in a daisy chain
format, as shown in Figure 3.5.
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Figure 3-5 The Daisy Chain Connection Controller to Controller
Two common INCORRECT connection methods are displayed in Figure3-6 as well.
EverAccess
EverAccess
2
3
1
ARM
A B C
D E F
4
5
6
G H I
J K L
M N O
7
8
9
PQRS
T U V
WXYZ
CLR
0
ENT
SYS
EverAccess
1
2
3
ARM
A B C
D E F
4
5
6
G H I
J K L
M N O
7
8
9
PQRS
T U V
WXYZ
CLR
0
ENT
SYS
EverAccess
2
1
3
ARM
A B C
D E F
4
5
6
G H I
J K L
M N O
7
8
9
PQRS
T U V
WXYZ
CLR
0
ENT
SYS
EverAccess
Figure 3-6 Two INCORRECT Connections
EverAccess
2
3
1
ARM
A B C
D E F
4
5
6
G H I
J K L
M N O
7
8
9
PQRS
T U V
WXYZ
CLR
0
ENT
SYS
EverAccess
1
2
3
1
2
ARM
A B C
D E F
A B C
4
5
6
4
5
G H I
J K L
M N O
G H I
J K L
7
8
9
7
8
PQRS
T U V
WXYZ
PQRS
T U V
CLR
0
ENT
SYS
CLR
0
EverAccess
1
2
A B C
4
5
G H I
J K L
8
7
PQRS
T U V
CLR
0
EverAccess
1
2
3
ARM
1
2
A B C
D E F
A B C
4
5
6
4
5
G H I
J K L
M N O
G H I
J K L
M N O
7
8
9
7
8
PQRS
T U V
WXYZ
PQRS
T U V
WXYZ
0
CLR
ENT
SYS
CLR
0
25
NAV IP Access Controller
2
3
1
ARM
A B C
D E F
4
5
6
G H I
J K L
M N O
7
8
9
PQRS
T U V
WXYZ
CLR
0
ENT
SYS
3
ARM
D E F
6
M N O
9
WXYZ
ENT
SYS
3
ARM
D E F
6
M N O
9
WXYZ
ENT
SYS
3
ARM
D E F
6
9
ENT
SYS
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