5.10 Communication
5.10.1 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
”
.
Addressing is performed by an external terminal or a PC with the appropriate software.
Automatic addressing can be started when the connections
“
ID1
”
and
“
ID2
”
for
“
Address-
ing
”
are connected with each other additionally next to the bus connection. I. e. it is no
longer necessary to address every user manually in the network (
MODBUS network-
ing and automatic addressing).
For automatic addressing with hand held terminal type A-G-247 and digital control and
display unit NETcon type A-G-102ANE max.
63
members, with control module UNIcon
MODBUS Master max.
32
members.
13.08.2013
v_modbus_connect_ext.vsd
ID1
GND
A
(D+)
B
(D-)
ID2
MODBUS
(RS-485)
A
d
d
re
s
s
in
g
A
d
d
re
s
s
in
g
ID1
GND
A
(D+)
B
(D-)
ID2
MODBUS
(RS-485)
A
d
d
re
s
s
in
g
A
d
d
re
s
s
in
g
Example for devices with MODBUS connection and automatic addressing
Information
•
You must ensure correct connection; i. e.
“
A(D+)
”
must also be
“
connected on
thefollowing 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).
•
Pay attention to su
ffi
cient distance from powerlines and motor wires (min. 20 cm)
•
Except the data link
“
A (D+)
”
,
“
B (D-)
”
the
“
ID1 - ID2
”
and the
“
GND
”
connection may no
further cable cores of the data line be used.
•
When using the connection box the cable shield of the CAT5 cable is internally
connected to
“
PE
”
by an RC element.
•
Another 63 users are connected by a repeater in manual addressing (no connection of
connections
“
ID1
”
,
“
ID2
”
).
•
If a repeater is necessary and automatic addressing should be carried out, only the
repeater of the Z-G-1NE type can be used, only it can relay the addressing signal.
•
The connections for the automatic addressing
“
ID1
”
and
“
ID2
”
are
not directly
connected electrically with each other. These may not be bridged; any order of
connection is possible.
Assembly instructions
ECblue
Electrical installation
L-BAL-F056-GB 2022/45 Index 005
Part.-No. 00700562-GB
26/44
