E+E Elektronik EE771 Series - Modbus RTU; Data Transmission; Addressing

15
Secondary addressing
In addition to primary addressing, the EE77x transmitter provides the option of secondary addressing. The
fields of identification number, manufacturer, version and medium are used together as the secondary
address. The exact sequence of the secondary addressing is described in detail in the M-Bus Standard: http://
www.m-bus.com/files/MBDOC48.PDF.
4.2.2. Modbus RTU
The measured values are stored as a 32 Bit float value. Depending on the measurement unit selected, the
measurements are saved in SI or US/GB units. The measurement unit can be changed using the configuration
software.
For resetting the MIN/MAX-Values write 0 to the corresponding write register.
For Modbus protocol setting please see Application Note AN0103 (www.epluse.com/EE771).
Modbus Map:
Register Protocol-
Address
Measuring Value SI-Unit US/GB-Unit
Read Registers (Function Code 0x03 / 0x04) / 32Bit float Value
30026 19 Standardized Flow Nm/s SFPM
30028 1B Standardized Volumetric Flow Nm
3
/h SCFPM
30030 1D Temperature °C °F
30032 1F Massflow kg/h kg/h
30034 21 Consumption reading m
3
ft
3
30036 23 Pressure bar psi
30261 104 MIN-Value Standardized Flow Nm/s SFPM
30263 106 MAX-Value Standardized Flow Nm/s SFPM
30265 108 MIN-Value Standardized Volumetric Flow Nm
3
/h SCFPM
30267 10A MAX-Value Standardized Volumetric Flow Nm
3
/h SCFPM
30269 10C MIN-Value Temperature °C °F
30271 10E MAX-Value Temperature °C °F
30273 110 MIN-Value Massflow kg/h kg/h
30275 112 MAX-Value Massflow kg/h kg/h
30277 114 MIN-Value Pressure bar psi
30279 116 MAX-Value Pressure bar psi
Write Registers (Function Code 0x06) / 16Bit integer Value
60261 104 Reset MIN/MAX-Value Standardized Flow
60262 105 Reset MIN/MAX-Value Standardized Volumetric Flow
60263 106 Reset MIN/MAX-Value Temperature
60264 107 Reset MIN/MAX-Value Massflow
60265 108 Reset MIN/MAX-Value Pressure
4.2.3. Data Transmission
Factory Setting
M-Bus
Factory Setting
Modbus
Adjustable Values
M-Bus Modbus RTU
Baud Rate 2400 9600 600...9600 9600...57600
Data Bits 8 8 8 8
Parity EVEN EVEN None, Odd, Even None, Odd, Even
Stop Bits 1 1 1 or 2 1 or 2
Slave-Address 1 1 0...254 1...247
4.2.4. Addressing
The flow meters are factory-set to address 1. The slave address can be set via switches on the PCB.
1 2 3 4 5 6 7 8
1 - ON
0 - OFF
1 2 3 4 5 6 7 8
1 - ON
0 - OFF
1 2 3 4 5 6 7 8
1 - ON
0 - OFF
1 2 3 4 5 6 7 8
1 - ON
0 - OFF
1 2 3 4 5 6 7 8
1 - ON
0 - OFF
1 2 3 4 5 6 7 8
1 - ON
0 - OFF
Factory Setting:
Slave-Address = 1
Slave-Address = 255
The address set using
the configurator software
is used.
Dip-Switch for address setting