Xylem Sensus Modbus RTU User manual

User Manual
Modbus RTU
Option module for PolluTherm
M H 6123 INT, page 1
1. Use of the option module
The Modbus RTU option module is used to connect the PolluTherm heat meters
to Modbus RTU network using EIA-485 channel.
Picture 1: Modbus RTU module
The module is based on Modbus RTU Slave protocol which is realized according to newest specifications
published by Modbus. The module EIA-485 network interface is compliant to TIA/EIA-485 standard.
1.1. Power supply
The Modbus RTU module should be powered by AC or DC (polarity insensitive) SELV power supply only.
SELV Power Supply Voltage 12-24 V AC/DC ±10%
Power Supply Terminals 60 and 61 (polarity insensitive)
Power Consumption max. 0.6 W
Typical Supply Current 32 mA @12 V DC
1.2. Communication interface
Connection to Modbus RTU network is realized by using galvanic isolated EIA-485 network interface.
Communication Protocol Modbus RTU
Network Polarity 90 (non-inverting, +) and 91 (inverting, -)
Transmission Speed/Baud Rate (bits per second) 1200, 2400, 4800, 9600, 14400, 19200,
38400, 56000, 57600, 115200
Data Format 8E1 (8 data bits, even parity bit, 1 stop bit),
8O1 (8 data bits, odd parity bit, 1 stop bit),
8N1 (8 data bits, none parity bit, 1 stop bit),
8N2 (8 data bits, none parity bit, 2 stop bits)
Galvanic Isolation between Network and Option Module 299 V
RMS (0-60 Hz)
Number of Devices per EIA-485 Segment Channel Up to 256 (⅛UL)
EIA-485 Network Topology Bus Topology
EIA-485 Segment Channel Length 1200 m
The default communication parameters are: 9600 bps baud rate, 8N1 data format, Modbus Slave ID – 1.
Use only the dedicated two terminators on both ends of EIA-485 network channel segment. In case of any
question, please contact technical support.
1.3. Environmental requirements
Operating Temperature (ambient) +5 to +50°C
Storage Temperature -10 to +65°C
Operating and Storage Humidity 25 to 90 % RH @50°C, non-condensing

User Manual
Modbus RTU
Option module for PolluTherm
M H 6123 INT, page 2
2. Safety instructions
The installation, electrical connection and commissioning the module should be made
by qualified specialists only.
The Modbus RTU option modules may only be used for the PolluTherm meters
otherwise the modules or the heat meter could be damaged.
The included lithium battery and the meter battery must not be recharged,
short-circuited, put in contact with water or exposed to temperatures of more than 80°C.
Battery and module waste may only be disposed at suitable collection centers
for professional waste disposal.
The communication modules are delivered in the form of circuit board. Is highly
recommended that normal static precautions be taken in handling and assembly of this
module to prevent damage and/or degradation which may be induced by ESD. Failure
to observe proper handling and installation procedures can cause damage. ESD
damage can range from subtle performance degradation to complete device failure.
3. Installation the option module in the Modbus RTU network
3.1. Status LED and Status Button functionality
The placement of the Status LED and Status Button is shown on the picture below.
Picture 2: Status Button and Status LED placement on the Modbus RTU option module
Status LED is signalizing every Modbus RTU communication event. Status LED is blinking on during request
receiving and response sending.
Press the button, then power on the module and hold the button pushed longer than 15 seconds to reset
device to factory settings (set Modbus Slave ID to default value 1, the Update Rate parameter to default
value 10 min and the communication interface to the defaults parameters – 9600 bps baud rate and 8N1
data format).
Status Button Status LED

User Manual
Modbus RTU
Option module for PolluTherm
M H 6123 INT, page 3
4. Modbus data register list
Designation Modbus
Register
Modbus
Register Type
Modbus
Address
Data Value
Range
Unit
1
Read only (RO)
Read/write (R/W)
Firmware
Version
2
30001 or 40001 Input or Holding 0 Uint16 - RO
Energy 30002 or 40002 Input or Holding 1 Int32
kWh, MWh,
MJ, GJ
RO
Energy
(Unit factor)
30004 or 40004 Input or Holding 3 UInt16 RO
Energy (Unit) 30005 or 40005 Input or Holding 4 4 char ASCII RO
Energy (Float) 30007 or 40007 Input or Holding 6 IEEE754 RO
Volume 30009 or 40009 Input or Holding 8 Int32
l (dm
3
), m
3
RO
Volume
(Unit factor)
30011 or 40011 Input or Holding 10 UInt16 RO
Volume (Unit) 30012 or 40012 Input or Holding 11 4 char ASCII RO
Volume (Float) 30014 or 40014 Input or Holding 13 IEEE754 RO
Flow 30016 or 40016 Input or Holding 15 Int32
l/h, m
3
/h
RO
Flow
(Unit factor)
30018 or 40018 Input or Holding 17 UInt16 RO
Flow (Unit) 30019 or 40019 Input or Holding 18 4 char ASCII RO
Flow (Float) 30021 or 40021 Input or Holding 20 IEEE754 RO
Power 30023 or 40023 Input or Holding 22 Int32
W, kW
RO
Power
(Unit factor)
30025 or 40025 Input or Holding 24 UInt16 RO
Power (Unit) 30026 or 40026 Input or Holding 25 4 char ASCII RO
Power (Float) 30028 or 40028 Input or Holding 27 IEEE754 RO
Inlet
temperature
(Fixed)
30030 or 40030 Input or Holding 29 Int16 0.01°C RO
Inlet
temperature
(Float)
30031 or 40031 Input or Holding 30 IEEE754 °C RO
Outlet
temperature
(Fixed)
30033 or 40033 Input or Holding 32 Int16 0.01°C RO
Outlet
temperature
(Float)
30034 or 40034 Input or Holding 33 IEEE754 °C RO
Temperature
difference
(Fixed)
30036 or 40036 Input or Holding 35 Int32 0.001°C RO
Temperature
difference
(Float)
30038 or 40038 Input or Holding 37 IEEE754 °C RO
Tariff Energy 30040 or 40040 Input or Holding 39 Int32
kWh, MWh,
MJ, GJ
RO
Tariff Energy
(Unit factor)
30042 or 40042 Input or Holding 41 UInt16 RO
Tariff Energy
(Unit)
30043 or 40043 Input or Holding 42 4 char ASCII RO
Tariff Energy
(Float)
30045 or 40045 Input or Holding 44 IEEE754 RO
Cooling Energy 30047 or 40047 Input or Holding 46 Int32
kWh, MWh,
MJ, GJ
RO
Cooling Energy
(Unit factor)
30049 or 40049 Input or Holding 48 UInt16 RO
Cooling Energy
(Unit)
30050 or 40050 Input or Holding 49 4 char ASCII RO
Cooling Energy
(Float)
30052 or 40052 Input or Holding 51 IEEE754 RO
Fabrication
Number
30054 or 40054 Input or Holding 53 Int32 - RO

User Manual
Modbus RTU
Option module for PolluTherm
M H 6123 INT, page 4
Designation Modbus
Register
Modbus
Register Type
Modbus
Address
Data Value
Range
Unit
1
Read only (RO)
Read/write (R/W)
Fabrication
Number
30056 or 40056 Input or Holding 55 8 char ASCII - RO
Customer
Location
30060 or 40060 Input or Holding 59 Int32 - RO
Customer
Location
30062 or 40062 Input or Holding 61 8 char ASCII RO
Modbus
Slave ID
3,4
41001 Holding 1000 UInt16 - R/W
Update Rate
Data from
Meter
5
41002 Holding 1001 UInt16 100 ms R/W
Baud Rate 41003 Holding 1002 UInt32 - R/W
Data Bits
6
41005 Holding 1004 UInt16 - R/W
Parity
6,7
41006 Holding 1005 UInt16 - R/W
Stop Bits
6
41007 Holding 1006 UInt16 - R/W
1
Units for Energy, Volume, etc. are available in (Unit) registers and apply to (Float) values as well as
integer values multiplied by (Unit factor).
Example on Energy registers - assume Energy = 43, Energy (Unit factor) = 100, Energy (Unit) = “Wh”,
Energy (Float) = 4300, then:
Energy register * Energy (Unit factor) register in Energy (Unit) register = 43 * 100 Wh = 4300 Wh
Energy (Float) register in Energy (Unit) register = 4300 Wh
2
Higher byte of the register is major number of firmware version (0x##00). Lower byte of the register is
minor number of firmware version (0x00##).
3
Lower byte of this register is Modbus address of the module in the range 1-247 (01-F7 hex).
4
If the higher byte is set to 1, the Modbus address will be updated to the heat meter M-Bus address.
If the higher byte is set to 0, the Modbus address is static.
5
Default Update Rate Data from Meter is 4 seconds. Value in Modbus register is 40 because 40 * 100
ms gives 4 seconds.
6
The registers should be set only the values represent data format on the EIA-485 serial interface
described in chapter Communication interface above.
7
This register is set by the ASCII char value – ‘E’ for Even parity (69 dec, 45 hex), ‘O’ for Odd parity
(79 dec, 4F hex) and ‘N’ for None parity (78 dec, 4E hex).
More details about Modbus communication and data decoding you find in Modicon Modbus Protocol
Reference Guide and MODBUS over Serial Line - Specification and Implementation Guide documents.

User Manual
Modbus RTU
Option module for PolluTherm
M H 6123 INT, page 5
5. Installation the option module in the calculators
The option module would be installed in the rear socked in the opened meter.
5.1. Opening of the meter
Remove the user seal from the housing of the meter
Open the housing cover
PolluTherm: Press both closing clips on the lower edges of the housing cover and open cover
upwards
Previous versions: Fold away the black locking latch and open housing cover
5.2. PolluTherm
The module has to be plugged in carefully
in the rear socket with the six contacts.
Please make sure that the four pins
of the module are plugged in the four
right contacts of the socket.
The two left contacts remain unused.
Picture 3: installed option module option module in current version of meter
For connection of cables first take the particular rubber form part from the calculator housing and pierce a
hole with a small screw driver. Then take the relevant cable, put it through the hole and cause a strain relief
with a cable strap (supplied). Connect the wires with the related terminals and put the rubber form part back
in the housing.
Close calculator enclosure afterwards and seal it with the supplied selflock-seal.
5.3. Previous versions of PolluTherm
The module has to be plugged in carefully
in the rear socket with the four contacts.
Picture 4: installed option module in previous version of meter
Each cable has to be put through a free cable gland and connected with the related terminals of the module.
Close the calculator housing afterwards and seal it with the supplied selflock-seal.
R
e
Rear socket, usage of the four right contacts
Rear socket

User Manual
Modbus RTU
Option module for PolluTherm
M H 6123 INT, page 6
6. Option module firmware changes list
Firmware version Description
2.1 Fixed readout timeouts when Slave ID based on heat meter M-Bus address option
was turned on.
Fixed lack of communication with the module when Slave ID based on heat meter
M-Bus address option was turned on.
Fixed always setting Slave ID based on heat meter M-Bus address option to on,
after restartin
g
the power suppl
y
.
2.0 Added support to update Baud Rate and Data Format (Data Bits, Parity, Stop Bits).
Added support to read Customer Location and Fabrication Number as numbers.
Added support to set Slave ID based on heat meter M-Bus address.
Changed Temperature Difference (Fixed) precision to 0.001°C.
Changed the default Update Rate from 15s to 4s.
Changed the default EIA-485 interface data format to 8N1 (8 data bits, none parity bit,
1 stop bit).
1.0 Initial version.
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Edition: 002 • 09-2018 (030-0005-01A)
Subject to changes without notice
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