5.13
Communication
5.13.1
Networking via MODBUS-RTU
The device comes equipped with a RS-485 interface for networking via MODBUS. Conntection at:
“
A
(D+)
”
,
“
B (D-)
”
and
“
GND
”
.
The address must be set in the
“
IO Setup
”
menu.
Information
A maximum of 64 members can be directly connected to one another, and another 63 members via a
repeater.
5.13.2
RS-485 - network design and interface parameter
Please ensure the correct connection; i.e. "A (D+)" must always be connected to "A (D+)" of the
next devices. 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).
G
N
D
D
+
D
-
G
N
D
D
+
D
-
16.04.2008
v_modbus_geraete_anschluss.vsd
general example for MODBUS device connection
The data line must be connected 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.
Examples for MODBUS connection
Recommended wire types
1. CAT5 / CAT7 cables
2. J-Y (St) 2x2x0.6 (telephone wire)
3. AWG22 (2x2 twisted pair)
When using telephone
fl
ex with four cable cores, we recommend the following allocation:
“
A (D+)
”
= red,
“
B (D-)
”
= black,
“
GND
”
= white
Information
•
Pay attention to suf
fi
cient distance from powerlines and motor wires (min. 20 cm)
•
Do not use wire shield
•
Except the data link "A (D+)", "B (D-)" and "GND"- connection may no further cable cores
of the data line be used.
•
Max. allowed wire length 1000 m (CAT5/7 500 m)
Default interface parameter
Baudrate
=
19200
Bits
=
8
Parity
=
Even (None, exception of devices agriculture)
Stop bits
=
1
Handshake
=
none
Operating Instructions
Fcontrol
–
model series FKDM..-C
Electrical installation
L-BAL-E057-GB 1304 Index 009
Part.-No. 00163327-GB
14/74
