Kara Systems BACnet:M-Bus User manual

User’s Manual
Kara BACnet Gateway Page 1
BACnet:M-Bus
BACnet:Modbus
Gateway
User’s M ANUAL
Kara Systems
www.karasystems.eu
Version: 2.2.23

User’s Manual
Kara BACnet Gateway Page 2
USER'S MANUAL
TABLE OF CONTENTS
1 GENERAL INFORMATION .............................................................................................................4
1.1 M-Bus .........................................................................................................................................4
1.2 Modbus.......................................................................................................................................4
1.3 BACnet.......................................................................................................................................4
1.4 Kara BACnet Gateway.............................................................................................................4
1.5 Scenario......................................................................................................................................6
2 Hardware M-Bus and Modbus (Tcp/IP)............................................................................................7
2.1 Ethernet Port .............................................................................................................................7
2.2 Serial Port ..................................................................................................................................8
3 Hardware with RS-485 (optional) ......................................................................................................8
3.1 Dip Switch..................................................................................................................................9
3.2 Serial Ports.................................................................................................................................9
4 Installation.........................................................................................................................................10
4.1 3.1 Ethernet LAN.....................................................................................................................10
4.2 3.2 BACnet Configuration......................................................................................................13
4.2.1 BACnet Device Instance:.....................................................................................................................13
4.2.2 BACnet Broadcast Management Device (BBMD)..............................................................................14
4.3 BACnet Objects.......................................................................................................................14
4.4 M-Bus Configuration..............................................................................................................14
4.4.1 Enable Baud rates for M-Bus:..............................................................................................................15
4.4.2 Serial Port Name:.................................................................................................................................15
4.4.3 Enable consumption:............................................................................................................................15
4.4.4 RS485 Interface ...................................................................................................................................15
5 Meter Readings..................................................................................................................................16
5.1 4.1 Export to Excel ..................................................................................................................17
5.2 4.2 Scanning Meters ................................................................................................................17
5.3 4.3 Meter Configuration .........................................................................................................18
5.3.1 Reading Interval:..................................................................................................................................18
5.3.2 Record No:...........................................................................................................................................18
5.3.3 Delete Meter: .......................................................................................................................................18
5.4...........................................................................................................................................................19
5.5 4.4 Meter Records....................................................................................................................19
5.6 4.5 Edit Records.......................................................................................................................19

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5.6.1 To BACnet Object...............................................................................................................................19
5.6.2 Unit......................................................................................................................................................20
6 MODBUS...........................................................................................................................................20
6.1 Adding Modbus Objects.........................................................................................................20
7 The BACNET Browser......................................................................................................................20
8 Recovery.............................................................................................................................................21
9 BACnet Specifications ......................................................................................................................21
6.1 BACnet Object Name..............................................................................................................23
9.1 6.2 BACnet Services Supported.............................................................................................23
9.2 6.3 BACnet specific Object Properties..................................................................................24

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Kara BACnet Gateway Page 4
1 GENERAL INFORMATION
1.1M-Bus
M-Bus (Meter-Bus) is a European standard (EN 13757-2 physical and link layer, EN 13757-3 application
layer) for the remote reading of gas or electricity meters. M-Bus is also usable for other types of
consumption meters. The M-Bus interface is made for communication on two wires, making it very cost
effective.
The M-Bus was developed to fill the need for a system for the networking and remote reading of utility
meters, for example to measure the consumption of gas or water in the home. This bus fulfills the special
requirements of remotely powered or battery driven systems, including consumer utility meters. When
interrogated, the meters deliver the data they have collected to a common master, such as a hand-held
computer, connected at periodic intervals to read all utility meters of a building.
1.2Modbus
Modbus is a serial communications protocol published by Modicon in 1979 for use with its
programmable logic controllers (PLCs). It has become a de facto standard communications protocol in
industry, and is now a commonly available means of connecting industrial electronic devices.
Modbus allows for communication between many devices connected to the same network, for example a
system that measures temperature and humidity and communicates the results to a computer. Modbus
supports communication over EIA-485, EIA-232 and Ethernet TCP/IP
1.3BACnet
BACnet is a communications protocol for building automation and control networks. It is an ASHRAE,
ANSI, and ISO standard protocol.
BACnet was designed to allow communication of building automation and control systems for
applications such as heating, ventilating, and air-conditioning control, lighting control, access control,
and fire detection systems and their associated equipment. The BACnet protocol provides mechanisms
for computerized building automation devices to exchange information, regardless of the particular
building service they perform.
1.4Kara BACnet Gateway
The Kara BACnet gateway is a 2 in 1 gateway for BACnet. It integrates M-Bus meters and Modbus
devices sensors into BACnet. It represents a BACnet Device and several BACnet objects. M-Bus meters

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Kara BACnet Gateway Page 5
are converted to BACnet Analog Inputs. Modbus Input discrete and Coils are converted to BACnet
Binary inputs and outputs respectively and Modbus Input/Holding Registers and converted to BACnet
Analog input and output objects.
The gateway supports both BACnet/IP and BACnet/Ethernet
The connection to BACnet is done over Ethernet LAN BACnet/IP or BACnet/Ethernet. To connect the
gateway to M-Bus you need a Level Convertor to convert the EIA-232( optional EIA-485) connection to
M-Bus physical Bus.

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1.5Scenario
The scenario shows an overview of the involved components. USB-Hub is only required if you connect
more than one bus to the device.

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2 HARDWARE M-BUS AND MODBUS (TCP/IP)
The Gateway runs on a high quality Industrial Linux computer.
The Device is based on a 32 Bit ARM processor running at 1.2Ghz.
Features:
•One 10/100 Mbps Ethernet
•One RS-232
•Integrated Power Supply
•Integrated Power Plug
•Power Type 50 – 60Hz 100 – 240 V
•Ultra-low power consumption, less than 5 Watts
•System cooling: passive
Dimensions: 68.5 x 110 x 48.5 mm
Regulation: CE Class A, FCC Class A
Operation Temperature: 0 to 70C(32 to 158F)
2.1Ethernet Port
The Ethernet Port use RJ45 connector
Pin Signal
1 ETx+
2 ETx-
3 ERx+
6 ERx-

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2.2Serial Port
The RS-232 comes with a DB9 Jack.
Pinning of DB9
connectors: Pin Jack Usage
2 RXD Receive from Level
convertor
3 TXD Send to Level Convertor
4
-
Unused
5 GND Ground potential
7 RTS Handshake unused
8
CTS
Always active
The RS-2332 cable can be connected directly to a Level Convertor such as PW20 from www.relay.de.
3 HARDWARE WITH RS-485 (OPTIONAL)
The Gateway runs on a high quality Industrial Linux computer.
The Device is based on a 32 Bit ARM processor running at 200 Mhz.
Features:
·ARM920T ARM Thumb Processor with 200MIPS at
·180MHz, Memory Management Unit
·One 10/100 Mbps Ethernet
·One 3-in-1 RS-232/422/485 ports and three RS-232 ports
·9 to 48 VDC Power input
·3 USB
·Two USB 2.0 full speed (12 Mbps) Host Ports
·Optional DIN RAIL mounting adaptor
·Ultra-low power consumption, less than 3 Watts
Dimensions: 78 x 108 x 24mm
Regulation: CE Class A, FCC Class A
Operation Temperature: 0 to 70C(32 to 158F)

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3.1 Dip Switch
The four keys DIP switch is used to configure serial port interface for Port 1. Key 1 and 2 are used to
configure the RS-232/422/485 mode of serial port P1 and Key3 and Key 4 are connected to GPIO and
they are reserved for the gateway software.
Switch
1
2
3
4
RS
-
232
ON
ON
RS
-
422
OFF
ON
RS
-
485
OFF
OFF
3.2 Serial Ports
The four serial ports use RJ45 connector and the pin assignment are shown as following table.
Pin RS-232 RS-422 RS-485
1
DSR
---
--
2
RTS
TXD+
Data+
3
GND
GND
GND
4
TX
D
TXD
-
Data
-
5
RXD
RXD+
---
6
DCD
RXD
-
---
7
CTS
---
---
8
DTR
---
---
The Names of the serial ports are:
Port 1 = ttyS1
Port 2 = ttyS2
Port 3 = ttyS3
Port 4 = ttyS4
Port 1: RS-232/422/485 (switch selection)
RS-232: RXD,TXD,RTS,CTS,GND
RS-422: TXD+, TXD-,RXD+,RXD-,GND
RS-485: DATA+,DATA-,GND
Port 2: RS-232: RXD, TXD, RTS, CTS, DSR, DTR, DCD, GND
Port 3: RS-232: RXD, TXD, RTS, CTS, GND
Port 4: RS-232: RXD, TXD, RTS, CTS, GND

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4 INSTALLATION
4.13.1 Ethernet LAN
Before connecting the Kara BACnet Gateway to your target LAN you have to configure the Network
Configuration of the device by connecting the device to an install network see Step 1.
Step 1:
Connect the gateway with an Ethernet cable direct to a Workstation and set the workstation IP number to
192.168.2.1.
Step 2:
Open the browser on the workstation and enter the following URL:
http://192.168.2.127
The Kara BACnet Gateway configuration is protected with a user name and password, so you will be
prompt a dialog to enter the user name and password.
The user name is admin .
The default password is password .
Please change the default password!
You will stay logged in till you close the browser.