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6. Mounting
Power down the equipment
Mount the module on standard rail (TH35 per IEC 60715 in
junction boxes and/or on distribution panels).
Installation
Electric installation and device termination shall be done by
qualified persons only, by respecting all applicable
specifications and regulations.
Plug in the terminal block for bus connection
1
2
Connect the cable for bus supply
5 mm
3
4
Mounting in series
5
6
• The module can be aligned without interspace. Use the jumper
plug to connect bus and supply voltage when the modules are
mounted in series.
The maximum quantity of modules connected in line is limi-
ted to 15 or to a maximum power consumption of 2 Amps
(AC or DC) per connection to the power supply. For any simi-
lar block of additional modules a separate connection to the
power supply is mandatory.
METZ CONNECT | Im Tal 2 | 78176 Blumberg | Germany | Phone +49 7702 533-0 | Fax +49 7702 533-433
Distributed by RIA CONNECT GmbH and BTR NETCOM GmbH
Mounting instruction see www.metz-connect.com
7. Bit rate and Parity setting
The bit rate and parity can be set in the programming mode when
ajumper is plugged behind the front cover of the module. This
jumper is removed in normal mode. A connection to the bus is
not required during bit rate setting.
The bit rate of the modules can be set in the following way:
1. remove the front cover of the module;
2. plug a jumper to the two middle pins of the 4 pole header
between the red and green LED (Á);
3. set the desired parity and bit rate with the address switches
(Â) in accordance to the chart below.
43
44
33
34
24V
24V
+24V
+24V
GND
GND
x10
�
B +
B+
x1
-
-
A
A
ERROR
BUSY
Jumper below
�
1
the faceplate
A
O
MR-TO4
MODBus RTU
13
23 24
14
4. switch on the supply voltage of the module; it is now per-
manently saving the bit rate in an EEPROM;
5. switch off the supply voltage of the module;
6. remove the jumper from the header and place the front
cover.
Switch
1
2
3
x10
Parity
even odd none
Switch
1
2
3
4
5
6
7
x1
Bitrate
1200 2400 4800 9600 19200 38400 57600 115200
(Bit/s)
If the settings differ from the settings specified in the chart the
factory setting applies.
Factory setting: 19200 Bd Even
8. Connection examples
Electro thermic valve actuators
N
24 V AC /
230 V AC
/
L
43
44
24V
+24V
GND
x10
B +
x1
-
A
ERROR
BUSY
1
2
3
1
A
O
MR-TO4
MODBus RTU
13
14
9. Software description
9.1 I/O Commands
„01 (0x01) Read Coils"
Request
Valid Starting Address
0 .. 7
Valid Quantity of Outputs
1 .. 8
Response
Byte Count
1
Output Status
Bit0 .. Bit7
Bit
Information
8
0 = Status relay 1 off
0
1 = Status relay 1 on
0 = Status relay 2 off
1
1 = Status relay 2 on
0 = Status relay 3 off
2
1 = Status relay 3 on
0 = Status relay 4 off
3
1 = Status relay 4 on
0 = relay 1 switched via bus
4
1 = relay 1 switched via manual control
0 = relay 2 switched via bus
5
1 = relay 2 switched via manual control
0 = relay 3 switched via bus
6
1 = relay 3 switched via manual control
0 = relay 4 switched via bus
7
1 = relay 4 switched via manual control
Continuation Software Description
"05 (0x05) Write Single Coil"
Request
Valid Output Address
Valid Output Value
Response
Echo of the request
"15 (0x0F) Write Multiple Coils"
33
34
Request
Valid Starting Address
Valid Quantity of Outputs
24V
Valid Byte Count
Output Value
+24V
GND
Bit
Information
B+
-
0 = Status relay 1 off
A
0
1 = Status relay 1 on
0 = Status relay 2 off
4
1
1 = Status relay 2 on
0 = Status relay 3 off
2
1 = Status relay 3 on
0 = Status relay 4 off
3
23 24
1 = Status relay 4 on
Response
Function Code, Starting Adress, Quantity of Outputs
"03 (0x03) Read Holding Registers"
Request
Valid Register Starting Address 0..1 or 66
Valid Quantity of Registers
Response
Function Code, Byte Count, Register Values
Bit
Information
0 = Status Triac 1 off
0
1 = Status Triac 1 on
0 = Status Triac 2 off
1
1 = Status Triac 2 on
0 = Status Triac 3 off
2
1 = Status Triac 3 on
0 = Status Triac 4 off
3
1 = Status Triac 4 on
0 = Triac 1 switched via bus
4
1 = Triac 1 switched via manual control
0 = Triac 2 switched via bus
5
1 = Triac 2 switched via manual control
0 = Triac 3 switched via bus
6
1 = Triac 3 switched via manual control
0 = Triac 4 switched via bus
7
1 = Triac 4 switched via manual control
0 .. 3
0x0000 or 0xFF00
0 .. 3
1 .. 4
1
0 or 1 in Bit0 .. Bit3
2 or 1
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