Table of Contents
Advertisement
4.2.
Bus Output (optional)
4.2.1.
M-Bus (Meter-Bus)
The M-Bus (Meter-Bus) is a field bus for recording consumption data. The transmission is carried out serially on a reverse
polarity protected two-wire line.
The following measurements are transmitted:
Standardized volumetric flow [Nm
Mass flow [kg/h]
Temperature [°C]
Consumption reading [m
The flowmeter as M-Bus slave requires a separate supply voltage!
There is no specific topology (phase or star) prescribed for the cabling. Normal telephone cable of type J-Y(St)Y Nx2x0.8
mm can be used. A maximum of 250 meters is permitted per segment.
4.2.2.
Modbus RTU
The measured values are stored as a 32Bit float value between 0x19 and 0x21. Depending on the measurement unit
selected, the measurements are saved in SI or US/GB units. The measurement unit can be changed using the configura-
tor software.
Modbus Map:
Register Address Protocol Address Measuring Value
30026
30028
30030
30032
30034
4.2.3.
Data Transmission
Factory Setting
Baud Rate
9600
Data Bits
8
Parity
NONE
Stop Bits
1
Slave-Address
1
4.2.4.
Addressing
The flowmeters are factory-set to address 1. The slave address can be set via switches on the PCB.
Dip-Switch for address setting
/h]
3
]
3
19
Standardized Flow
1B
Standardized Volumetric Flow Nm
1D
Temperature
1F
Massflow
21
Consumption reading
Adjustable Values
M-Bus
600...9600
8
None, Odd, Even None, Odd, Even
1 or 2
0...254
1 - ON
1 - ON
0 - OFF
0 - OFF
1 - ON
1 - ON
0 - OFF
0 - OFF
1 - ON
1 - ON
0 - OFF
0 - OFF
SI-Unit
Nm/s
/h
3
°C
kg/h
m
3
Modbus RTU
9600...57600
8
1 or 2
1...247
1
2
3
4
5
6
7
8
1
2
3
4
5
6
7
8
1
2
3
4
5
6
7
8
1
2
3
4
5
6
7
8
1
2
3
4
5
6
7
8
1
2
3
4
5
6
7
8
14
US/GB-Unit
SFPM
SCFPM
°F
kg/h
ft
3
Factory Setting:
Slave-Address = 1
Slave-Address = 255
The address set using
the configurator software
is used.
Advertisement
Table of Contents
