Solvimus MBUS-PU3 User manual

MBUS-PU3 -USER MANUAL
solvimus GmbH –Ratsteichstr. 5 –98693 Ilmenau –Deutschland
Telefon: [phone] –Fax: [phone] –E-Mail: [e-mail]
...wir lösen. www.solvimus.de
MBUS-PU3
USB LEVEL CONVERTER FOR
PORTABLE APPLICATIONS
Version 1.10
Datum: 2018-01-24
Author:
Remo Reichel
solvimus GmbH
Ratsteichstr. 5
98693 Ilmenau
Germany

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Table of contents
1General hints and conventions....................................................................................................................................4
1.1 About this document.............................................................................................................................................4
1.2 Legal bases .................................................................................................................................................................4
1.2.1 Copyright ..........................................................................................................................................................4
1.2.2 Personnel qualifications .............................................................................................................................4
1.2.3 Technical condition of specified devices............................................................................................4
1.3 Symbols........................................................................................................................................................................4
1.4 Font conventions.....................................................................................................................................................5
1.5 Number notation.....................................................................................................................................................5
1.6 Safety guidelines......................................................................................................................................................5
1.7 Scope.............................................................................................................................................................................6
1.8 Abbreviations............................................................................................................................................................6
1.9 Versions........................................................................................................................................................................6
2General information .........................................................................................................................................................7
2.1 Device variants..........................................................................................................................................................7
2.2 Connectors .................................................................................................................................................................8
2.3 State LEDs....................................................................................................................................................................8
3Use of the device................................................................................................................................................................9
3.1 Driver installation.....................................................................................................................................................9
3.2 Configuration of the logical bus master..................................................................................................... 10
3.3 Signaling at the M-Bus........................................................................................................................................ 11
4Troubleshooting.............................................................................................................................................................. 12
4.1 Hardware errors..................................................................................................................................................... 12
4.1.1 The device does not respond................................................................................................................ 12
4.1.2 The device does not get enumerated by the host system ...................................................... 12
4.2 Error in meter reading ........................................................................................................................................ 12
4.2.1 The TX LED does not light up................................................................................................................ 12
4.2.2 The RX LED does not light up................................................................................................................ 12
5Technical data .................................................................................................................................................................. 13
5.1 General characteristics ....................................................................................................................................... 13
5.1.1 Physical dimensions / Weight............................................................................................................... 13
5.1.2 Installation / Storage................................................................................................................................. 13
5.2 Electrical characteristics..................................................................................................................................... 13
5.2.1 Power supply................................................................................................................................................ 13
5.2.2 Meter interfaces........................................................................................................................................... 13
5.2.3 Communication interfaces..................................................................................................................... 13
5.2.4 Galvanic isolation........................................................................................................................................ 13

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1General hints and conventions
1.1 About this document
This manual provides guidance and procedures for a fast and efficient installation and start-up of
the units described in this manual. It is imperative to read and carefully follow the safety guidelines.
1.2 Legal bases
1.2.1 Copyright
This manual, including all figures and illustrations, is copyright-protected. Any further use of this
manual by third parties that violate pertinent copyright provisions is prohibited. Reproduction,
translation, electronic and photo-technical filing/archiving (e.g. photocopying) as well as any
amendments require the written consent of solvimus GmbH.
Non-observance will involve the right to assert damage claims.
The solvimus GmbH reserves the right to provide for any alterations or modifications that serve to
increase the efficiency of technical progress. All rights arising from the granting of patents or from
the legal protection of utility patents are owned by the solvimus GmbH. Third-party products are
always mentioned without any reference to patent rights. Thus, the existence of such rights cannot
be excluded.
1.2.2 Personnel qualifications
The use of the product described in this manual requires special personnel qualifications. All
responsible persons have to familiarize themselves with the underlying legal standards to be
applied, i. e.:
Valid standards
Handling of electronic devices
The solvimus GmbH does not assume any liability whatsoever resulting from improper handling
and damage incurred to both, solvimus own and third-party products, by disregarding detailed
information in this manual.
1.2.3 Technical condition of specified devices
The supplied components are equipped with hardware and software configurations, which meet
the individual application requirements. Changes in hardware, software and firmware are permitted
exclusively within the framework of the various alternatives that are documented in the specific
manuals. The solvimus GmbH will be exempted from any liability in case of changes in hardware or
software as well as to non-compliant usage of components.
Please send your request for modified and new hardware or software configurations directly to the
solvimus GmbH.
1.3 Symbols
Danger: Always observe this information to protect persons from injury.
Warning: Always observe this information to prevent damage to the device.
Attention: Marginal conditions that must always be observed to ensure smooth and
efficient operation
ESD (Electrostatic Discharge): Warning of damage to the components through electrostatic
discharge. Observe the precautionary measure for handling components at risk of
electrostatic discharge.
Note: Make important notes that are to be complied with so that a trouble-free and efficient
device operation can be guaranteed.

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Additional information: References to additional literature, manuals, data sheets and
internet pages.
1.4 Font conventions
Names of paths and data files are marked in italic-type. According to the system, Slashes or
Backslashes are used.
i. e.: D:\Data\
Menu items are marked in italic-type, bold letters.
i. e.: Save
Sub-menu items or navigation steps within a web browser are marked by using an arrow between
two menu items or tabs.
i. e.: File → New
Pushbuttons or input fields are marked with bold letters.
i. e.: Input
Keys are marked with bold capital letters within angle brackets.
i. e.: <F5>
The print font for program codes is Courier.
i. e.: END_VAR
Names of variables, designators and configuration fields are marked in italic-type.
i. e.: Value
1.5 Number notation
Numbers are noted according to this table:
Number code
Example
Note
Decimal
100
Normal notation
Hexadecimal
0x64
C Notation
Binary
'100'
in quotation marks
'0110.0100'
nibbles separated with dot
Table 1: Numbering systems
1.6 Safety guidelines
All power sources to the device must always be switched off before carrying out any
installation, repair or maintenance work.
Replace any defective or damaged devices/modules (i.e. in the event of deformed contacts), as the
functionality of the devices cannot be ensured on a long-term basis.
The components are not resistant against materials having seeping and insulating characteristics.
Materials like e.g. aerosols, silicones, triglycerides (found in some hand creams) belong to this group.
If it cannot be ruled out that these materials appear in the component environment, then the
components must be installed in an enclosure that is resistant against the above mentioned
materials.
Clean tools and materials are generally required to operate the device/module.
Only use a soft, wet cloth for cleaning. Soapy water is allowed. Pay attention to ESD.
Do not use solvents like alcohol, acetone etc. for cleaning.
Do not use contact sprays, which could possibly impair the functioning of the contact area
and may cause short circuits.

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Components, especially OEM modules, are designed for the mounting into electronic
housings. Those devices shall not be touched when powered or while in actual operation.
The valid standards and guidelines applicable for the installation of switch cabinets shall be
adhered to.
The devices are equipped with electronic components that may be destroyed by
electrostatic discharge when touched. It is necessary to provide good grounding to
personnel, working environment and packing. Electroconductive parts and contacts should
not be touched.
1.7 Scope
This manual describes the devices mentioned in the title, supplied by solvimus GmbH, Ilmenau.
1.8 Abbreviations
Abbreviation
Description
DIN
Deutsches Institut für Normung (German standardization body)
ESD
ElectroStatic Discharge
FTP
File-Transfer Protocol
HTTP
HypertextTransfer Protocol
ID
Identifier
LED
Light-Emitting Diode
M-Bus
Meter-Bus (EN 13757,Part 2 - 3)
MUC
Multi Utility Communication,MUC-Controller
OEM
Original Equipment Manufacturer
PID
Product ID
UART
Universal Asynchronous Receiver Transmitter
UL
Unit load,equal to 1.5 mA current draw per UL
UTC
Coordinated Universal Time
VID
Vendor ID
VCP
Virtual COM port
wM-Bus
Wireless Meter-Bus (EN 13757,Part 3 - 4)
Table 1: Abbreviations
1.9 Versions
Version
Datum
Editor
Veränderungen
1.00
2017-05-22
Remo Reichel
Initial Version
1.10
2017-05-20
Sven Ladegast
Added technical data of the USB interface
Added hint of maximum load of 3 UL
Added M-Bus line identifiers to the product figure
Table 2: Versions of this document

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2General information
The M-Bus (Meter-Bus) is an established and well known interface for automated meter reading.
Especially the ease of installation (simple two-wire system with powering by the bus) and the
robustness are important features. These are also special attributes that are of interest for use in
industrial environments.
The M-Bus is defined in the standard EN 13757. There is an own physical layer as well as an own
protocol. For connecting it to other systems a translation is necessary.
The transmission of data bits on the physical layer of the M-Bus protocol is equal to a standard UART
interface. The data will be transmitted with a common timing. Simply the voltage and current levels
are designative for the M-Bus physical layer. A high clearance between low and high signal levels
makes the M-Bus a very robust interface and enables a continuous power supply of the connected
devices (slaves) through the M-Bus master.
By simply converting the signal level to the M-Bus levels, any UART interface will be M-Bus-enabled.
By the use of a level converter every standard PC with a serial interface can become a (physical)
M-Bus master. These level converters do translate the physical layer of the serial interface to the
physical layer of the M-Bus.
Usually there are a lot of M-Bus level converters for RS-232 interfaces on the market. But certainly
the distribution of these RS-232 interfaces is regressive. Modern mobile equipment such as
notebooks or tablet PCs often do not offer a RS-232 interface at all.
USB has replaced the RS-232 interfaces almost completely. Therefore it is useful to offer a level
converter with a direct USB interface to connect to these devices and also modern PCs. The M-Bus
logical layer is then mapped by PC software. This enables easy readout and configuration of M-Bus
devices through a PC.
The MBUS-PU3 is a very compact and self-powered USB level converter. It is specially designed for
field-use by service technicians to configure single devices or readout very small M-Bus networks.
The very compact footprint makes it a versatile tool for portable and stationary use.
The MBUS-PU3 supports the operation of up to 3 UL on its M-Bus interface. The device is mounted
within a standard USB stick housing and can be connected directly to a USB type A sockets of the
terminal device. All necessary voltages to supply the M-Bus are generated at the MBUS-PU3 directly
from the USB power supply. There is no need for any additional external power supply.
2.1 Device variants
Das MBUS-PU3 is a compact self-powered USB to M-Bus level converter.
Variant
Ordner number
M-Bus interface
MBUS-PU3
500358
Max.3 UL
Table 3: Device variants

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2.2 Connectors
The interfaces and connectors of the MBUS-PU3 are available on different sides of the device.
The following figure shows the device:
Figure 1: MBUS-PU3
The MBUS-PU3 is equipped with the following connectors:
Connector
Marking
Pinning
Remark
USB connector type A
USB
VUSB: Positive power supply
D-: Data line Data-
D+: Data line Data+
GND: Negative power supply
USB-Stecker,Typ A,USB 1.1/2.0/3.0
Full-Speed (12 MBps)
M-Bus terminals
MBUS+,MBUS-
MBUS+: Positive bus terminal
MBUS-: Negative bus terminal
Removable connector with spring
terminals
Connecting cable ≤1,5mm²
Table 4: Connectors
2.3 State LEDs
Within the translucent housing there are three state LEDs which show the operational state of the
device:
LED
Color
Description
Power
Rot
The device is powered by the USB bus
Transmit
Gelb
Data is transmitted from the MBUS-PU3 to the slaves
Receive
Grün
Data is received by the MBUS-PU3 from the slaves
Table 5: State LEDs of the MBUS-PU3

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3Use of the device
After connecting the MBUS-PU3 to the host system via an USB interface the device will be ready for
operation instantly. The red power LED shows correct operation.
Figure 2: Typical use case scenario for the MBUS-PU3
There are no steps needed on the device side to bring the MBUS-PU3 into service. All additional
steps must be carried out at the host system (for e.g. a notebook).
3.1 Driver installation
The MBUS-PU3 is based upon the USB serial converter CP2104 by Silicon Laboratories. Drivers need
to be installed possibly depending on the operating system version.
The driver installation files can be obtained from the manufacturer’s website:
http://www.silabs.com/products/development-tools/software/usb-to-uart-bridge-vcp-
drivers
The driver installation is started by executing the installer executable:
Figure 3: Dialog of the driver installer
It is best practice to install the driver before connecting the MBUS-PU3 to the host system
the first time.
USB
MBUS-PU3
Host

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Figure 4: Driver installation upon first connect of the MBUS-PU3 to the host system
Once driver installation is complete, the MBUS-PU3 is ready for operation with any software that can
utilize a standard COM port of the host system.
3.2 Configuration of the logical bus master
The VCP driver creates an individual (virtual) COM port for each MBUS-PU3 that is connected to the
host system. This COM port can be used as every standard COM port by any M-Bus software.
When using Microsoft Windows™, the assigned COM port number can be easily found by the use of
the device manager.
Figure 5: Windows™ device manager showing CP210x USB to UART Bridge at COM14
Additional interface parameters of the serial interface are normally configured by the
communication software itself. These settings are normally inherited for the M-Bus. The following
table shows the standard parameters used at the M-Bus:
Parameter
Value
Remarks
Baud rate
2400 bps
300,2400 and 9600bps are common,2400bps is the standard baud rate
Data bits
8
The M-Bus uses 8 data bits
Parity
Even
The M-Bus uses even parity
Stop bits
1
The M-Bus uses 1 stop bit
Table 6: Parameters of the COM port interface
Please ask your software distributor how to configure your particular software product.

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3.3 Signaling at the M-Bus
The M-Bus utilizes voltage and current modulation for transmission of data on its physical layer.
The following figure shows how the communication works:
Figure 6: Signaling on the M-Bus
Because there is no detection of the M-Bus idle current carried out at the MBUS-PU3, the
maximum bus load shall not exceed 4 UL (4.5 mA bus current). In this way, safe recognition
of the space signal within response packets of the M-Bus slaves is ensured.

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4Troubleshooting
In case the MBUS-PU3 does not work as described in this document, it is useful to locate the
malfunction in order to resolve the issue and to recover the full functionality again.
4.1 Hardware errors
4.1.1 The device does not respond
The device does not show any reaction after connecting it to the host system. No LEDs are lighting
up and the device does not get enumerated by the host.
Please check the USB connector if it is defective or if it is activated at all.
If errors could not be resolved, please contact our customer support:
email: [e-mail]
4.1.2 The device does not get enumerated by the host system
The red power LED is lighting up but there is no corresponding COM part available at the host
system.
Please check the host system for the correct device driver:
Is there a driver installed for the CP2104?
Is there an additional USB device with VID = 0x10C4 and PID = 0xEA60 ?
Is the USB connector defective or activated at all?
Please also try to connect the MBUS-PU3 to another USB port of the host system.
If errors could not be resolved, please contact our customer support:
email: [e-mail]
4.2 Error in meter reading
4.2.1 The TX LED does not light up
Please check the USB connector at the host system.
If errors could not be resolved, please contact our customer support:
email: [e-mail]
4.2.2 The RX LED does not light up
Please check the bus cable between the MBUS-PU3 and the M-Bus slave device. Exchange any
defective cables.
Measure the voltage across the terminals MBUS+ and MBUS-. There must be a DC voltage of about
32 VDC present at these terminals.
If there is no such 32 VDC voltage, please check the M-Bus for any shorts:
Detach the M-Bus from the device and measure the DC voltage between MBUS+ and
MBUS- again.
If the voltage is now about 32 VDC, the internal fuse may have switched off the bus caused
by bus overload.
If possible, please measure the current draw on the M-Bus
If no data is received, the problem may also originate from the protocol processing within the PC
software. Please check all settings that have an influence on the protocol processing.
If errors could not be resolved, please contact our customer support:
email: [e-mail]

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5Technical data
5.1 General characteristics
5.1.1 Physical dimensions / Weight
The housing has the following dimensions (including connector):
Width: 19 mm
Height: 15 mm
Depth: 79 mm
Weight: approx. 15 g
5.1.2 Installation / Storage
The device is intended for portable use:
Storage temperature: -20 –70 °C
Operating temperature: 0 –50 °C
Humidity: 10 –95 % relH, non-condensing
Protection class: IP20
5.2 Electrical characteristics
5.2.1 Power supply
The device is a self-powered USB device:
Voltage: 5 V(DC) ± 5 %, USB connector, type A
Power consumption: <0.1 W (idle state), max. 0.5 W
Safety: Over voltage protection (transient)
5.2.2 Meter interfaces
The device is equipped with an M-Bus interface (pin assignment according to section 2.2):
Compliant to EN 13757-2, Uspace = 32 V, Umark = 20 V, Spring terminals (≤1,5 mm²)
Max. bus load: 3 UL
Max. current draw (continuously): approx. 30 mA
Max. baud rate: 9600 bps
5.2.3 Communication interfaces
The device is equipped with an USB communication interface (pin assignment according to section
2.2):
USB device: CP2104 by Silicon Laboratories
USB connector: USB connector type A, compliant to USB 1.1, 2.0 and 3.0
USB speed: Full-Speed (12 MBps)
USB Vendor-ID (VID): 0x10C4
USB Product-ID (PID): 0xEA60
5.2.4 Galvanic isolation
The M-Bus interface and the USB interface are not galvanically isolated.