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5.3 RS-485 interface for MODBUS
The device comes equipped with a RS-485 interface for networking via MODBUS.
Conntection at:
“ A (D+) ” , “ B (D-) ” and “ GND ” .
11.03.2014
v_am_modbus_connect.vsd
ID1 GND
A
(D+)
B
(D-)
ID2 GND
A
(D+)
B
(D-)
B
(D-)
ID1 GND
A
(D+)
B
(D-)
ID2 GND
A
(D+)
MODBUS
(RS-485)
MODBUS
(RS-485) A
d
d
re
s
s
in
g
A
d
d
re
s
s
in
g
MODBUS
(RS-485)
MODBUS
(RS-485) A
d
d
re
s
s
in
g
A
d
d
re
s
s
in
g
The connections for MODBUS “ A (D+) ” , “ B (D-) ” and “ GND ” are available double on the module and
are connected with each other internally.
Information
•
You must ensure correct connection; i.e. “ A (D+) ” must also be connected on the
following devices to “ A (D+) ” . The same applies to “ B (D-) ” .
•
In addition, a "GND" connection must be established, as dissimilar potential (over 10
V!) will lead to the destruction of the RS-485 interface (e.g. lightning).
•
Except the data link “ A (D+) ” , “ B (D-) ” and “ GND ” (for automatic addressing additional
“ ID1 ” - “ ID2 ” see following chapter) no further cable cores of the data line may be used.
•
Pay attention to suf fi cient distance from powerlines and motor wires (min. 20 cm).
•
A maximum of 64 participants can be directly connected to one another, and a further
63 participants via a repeater. To support automatic addressing the repeater type Z-G-
1NE is available.
Example for MODBUS connection
MODBUS
26.02.2007
v_modbus_verbindung.vsd
The data line must be conducted from one device
to the next. No other type of wiring is allowed!
Always use only two wires of one lead (twisted
pair) for the connection.
Recommended wire types
1. CAT5 / CAT7 cables
2. J-Y (St) 2x2x0.6 (telephone cable)
3. AWG22 (2x2 twisted pair)
Max allowed wire length 1000 m (CAT5/7 500 m).
Shielding
The use of shielded cables is normally not needed but offers high protection against
electromagnetic interferences, especially high frequencies. However, the effectiveness
of the shield depends on careful installation of the line.
Quick Start Guide AM-MODBUS-WB Installation
L-BAL-E281-GB 2021/36 Index 004 Part.-No.
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