8. Connection examples
Connection examples 1 and 2
11
44
C1
C1
C1
C1
12
12
22
22
22
33
C1
C1
C1
C1
1111
21
21
14
14
24
24
11
22
33
44
24V
24V
24V
24V
+24V
+24V
GND
GND
+24V
+24V
GND
GND
ERROR
ERROR
B +
B +
A
A --
MR-DIO4/2
MR-DIO4/2
B +
B +
A
A --
BUSY
BUSY
x1
x1
x10
x10
MODBus RTU
MODBus RTU
A1 (24 V
A1 (24 VA
AC/DC)
C/DC)
N
N
LL
Jumper unter
Jumper unter
der Blende
der Blende
Connection example 3
A2 (GND)
A2 (GND)
N
N
LL
11
44
C1
C1
C1
C1
12
12
22
22
22
33
C1
C1
C1
C1
1111
21
21
14
14
24
24
11
22
33
44
24V
24V
24V
24V
+24V
+24V
GND
GND
+24V
+24V
GND
GND
ERROR
ERROR
B +
B +
A
A --
MR-DIO4/2
MR-DIO4/2
B +
B +
A
A --
BUSY
BUSY
x1
x1
x10
x10
MODBus RTU
MODBus RTU
Jumper unter
Jumper unter
der Blende
der Blende
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 limited
to 15 or to a maximum power consumption of 2 Amps (AC or
DC) per connection to the power supply. For any similar block
of additional modules a separate connection to the power
supply is mandatory.
Mounting in series
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.
4. switch on the supply voltage of the module; it is now perma-
nently 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.
If the settings differ from the settings specified in the chart the
factory setting applies.
Factory setting: 19200 Bd Even
1
1
44
C1
C1
C1
C1
12
12
22
22
22
33
C1
C1
C1
C1
1111
21
21
14
14
24
24
1
1
22
33
44
24V
24V
24V
24V
+24V
+24V
GND
GND
+24V
+24V
GND
GND
ERROR
ERROR
B +
B +
A
A --
MR-DIO4/2
MR-DIO4/2
B +
B +
A
A --
BUSY
BUSY
x1
x1
x10
x10
MODBus RTU
MODBus RTU
JJ
+24V
+24V
GND
GND
Jumper below
Jumper below
the faceplate
the faceplate
Á
Á
Â
Â
Switch
x1
0
1
2
3
4
5
6
7
Bitrate
(Bit/s) 1200 2400 4800 9600 19200 38400 57600 115200
Switch
x10
0
1
2
Parity even odd none
9. Software description
9.1 I/O Commands
"01 (0x01) Read Coils"
Request
Valid Starting Address 0 .. 3
Valid Quantity of Outputs 1 .. 4
Response
Byte Count 1
Output Status Bit0 .. Bit3 (Bit 4 .. 7=0)
Bit
Information
0
0 = Status relay 1 off
1 = Status relay 1 on
1
0 = Status relay 2 off
1 = Status relay 2 on
2
0 = relay 1 switched via bus
1 = relay 1 switched via manual control
3
0 = relay 2 switched via bus
1 = relay 2 switched via manual control
"02 (0x02) Read Discrete Inputs"
Request
Valid Starting Address 0 .. 3
Valid Quantity of Inputs 1 .. 4
Response
Byte Count 1
Input Status Bit0 .. Bit3 ( Bit 4 .. 7 = 0 )
Information
1= Status input closed
0= Status input open
“05 (0x05) Write Single Coil”
Request
Valid Output Address 0 .. 1
Valid Output Value 0x0000 or 0xFF00
Response
Echo of the request
“15 (0x0F) Write Multiple Coils”
Request
Valid Starting Address 0 .. 1
Valid Quantity of Outputs 1 .. 2
Valid Byte Count 1
Output Value 0 or 1 in Bit0 .. Bit1
Bit
Information
0
0 = Status relay 1 off
1 = Status relay 1 on
1
0 = Status relay 2 off
1 = Status relay 2 on
Response: Function Code, Starting Adress,
Quantity of Outputs
BTR NETCOM GmbH
Im Tal 2
78176 Blumberg
Germany
Phone +49 7702 533-0
Fax +49 7702 533-189
Mounting instruction see
www.metz-connect.com
2
1
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
4
3
5 mm
Connect the cable for bus supply
