Table of Contents
Advertisement
Modbus RTU wiring diagram
If you want to read the data of several devices using a browser, connect the devices to the RTU bus. You can bring bus
devices up to Ounet using the M-Link. We recommend that you connect a maximum of 10 devices to the RTU bus.
Terminal resisstor
120 ohm
TE (PE)
Datajamak
2 x (2+1) x 0.24
All participants of the network must have the same baud rate, data bits, stop bits and paritity. EH-
100/EH-200 devices has follow settings: data bits 8, stop bits 1 and paritity "None".Be sure that de-
vices have unique slave address. The address of EH-200/EH-105 devices will be set by DIP switches
3 and 4.
Modbus-100/200
Terminal resistor
120 ohm
Master device
-M-Link (A,B)
- C203 (A1,B1)
- H23 (A, B)
- S203 (A, B)
A
- Ouflex M BA (A1, B1)
B
Ouflex M
-
(A1, B1) or
- WL-Base (A, B)
C203-slave
(all versions)
23 B1
22 A1
21 BG
S203 or H23 -slave
(all versions)
6 B
3 A
Ouflex M or Ouflex M BA -slave
6 BG
7 B1
8 A1
Modbus device
(All Ouman devices
B
and also third party
A
devices, which have
MB-RTU support)
WL-BASE
B
A
EH-105/EH-200
MC-
C
C
A
A
MA+
24~
24VAC
(Take a supply voltage of the Modbus-100/200
device from the regulator (strip connector 41)
C
B
A
EH-100/EH-200
Attention! Ouman Ouflex C devices have the following fac-
tory default settings:
Modbus slave address 10
Baud rate
9600
Data bits
8
Stop bits
1
Paritity
None
If the Modbus-RTU bus has multiple devices, the Modbus
slave addresses must be unique.
Do changes to the controller:
Systen settings-> Network settings-> Modbus RTU settings.
A twisted pair cable must be used for network cabling, e.g.,
Datajamak 2x(2+1)x0.24. The network must be like a chain,
with the cable going from one device to the next and stubs are
not recommended (max. length of stub 0.5m). The maximum
length of the whole network is 1200m. 120 ohm terminating
resistors are connected to both ends of the network.
The twisted pair cable' s protective shield can be connected
if needed in to protective earth in order to eliminate inter-
ference. The connection is made only from the other end of
the protective shield, e.g., always from the cable leaving the
controller.
Modbus-100-DIN/
EH-100/EH-200
Modbus-200-DIN
Modbus-100/Modbus-200
6
DIP1 DIP2 Biasing resistors
0
0
Not in use
1
0
In use
If EH-200/EH-100 is the first
or last device in the bus, bi-
asing resistor must be taken
into use
DIP3 DIP4 Baud rate
0
0
4800
1
0
9600
0
1
19200
1
1
38400
DIP switches, 1 = ON
DIP 5
DIP 9 = Address
1 0 0 0 0 = 1
0 1 0 0 0 = 2
1 1 0 0 0 = 3
0 0 1 0 0 = 4
1 0 1 0 0 = 5
... ... ... ... ... ... ...
1 1 1
1
1 =
31
Advertisement
Table of Contents
