INTRODUCTION
CMa30 is a USB M-Bus master specifically designed for mobile
use. In combination with a laptop, it is suitable for installation and
troubleshooting of M-Bus slaves. CMa30 is also suitable for fast and
easy reading of small M-Bus systems. Drivers for CMa30 and more
information about M-Bus can be downloaded from the Elvaco website,
www.elvaco.com.
OVERVIEW
CMa30
USB M-Bus master
1. USB port
2. PWR LED green
3. ERR LED red
4. RX LED yellow
5. TX LED yellow
6. M-Bus connection
INSTALLATION
Drivers for CMa30 have to be installed on the computer before using
CMa30. Drivers are available for download at www.elvaco.com
(http://www.elvaco.com/en/download/31160)
Start the installation guide and follow the instructions.
Connect the CMa30 to the USB port in the computer and check which
COM port number the device received in the device manager. See the
Troubleshooting section for more information.
M-BUS 2-WIRE BUS
M-Bus is a multi-drop 2-wire bus with no polarity. Connect the wiring
to terminal (6). CMa30 handles up to 30 slaves. Overloading the bus
will turn on the ERR LED and turn off the M-Bus bus. All connected
M-Bus slave devices must have unique primary or secondary addresses
depending on addressing mode.
LED INDICATIONS
Green PWR LED
PWR LED indicates mains supply.
Mode Description Visual
Permanently on Mains power
connected
Permanently off No mains power
connected
Red ERR LED
ERR LED indicates M-Bus 2-wire bus status.
Mode Description Visual
Permanently on Short circuit of the
M-Bus 2-wire bus
Permanently off Normal mode, Idle
Short flash every
second
No M-Bus slaves
connected
Flashing for 1
second
M-Bus slave
collision
Yellow RX LED
RX LED indicates communication from M-Bus slave to computer.
Mode Description Visual
On/Flashing M-Bus slave is
transmitting data
Off M-Bus slave is not
transmitting data
Yellow TX LED
TX LED indicates communication from computer to M-Bus slaves.
Mode Description Visual
On/Flashing Computer is
transmitting data
Off Computer is not
transmitting data
© 2016, Elvaco AB. All rights reserved. The documentation and product are provided on an “as is” basis only and may contain deficiencies or
inadequacies. Elvaco AB takes no responsibility for damages, liabilities or other losses by using this product. No part of the contents of this
manual may be transmitted or reproduced in any form by any means without the written permission of Elvaco AB. Printed in Sweden.
CMa30 Quick manual A4 English
Document id: 1090071
Version: 3.0
Mechanics
Protection class IP41
Dimensions 98x57x26 mm
Weight 95 g
Connection M-Bus Pluggable screw terminal
0.25-2.5 mm²
Mounting Desktop
Cable USB type A-B 0.6 m
Electrical
Power supply USB type B 5 V 500 mA
Power consumption at 1 T 160 mA
Environmental
Operating temperature
range
-20 °C to +55 °C
Storage temperature range -40 °C to +85 °C
Pollution Degree 2
Operating altitude 0-2000 m
M-Bus
M-Bus standard EN 13757
M-Bus baud rate 300, 2400 Bit/s
Maximum connected M-Bus
loads
30 (one load is 1.5 mA)
Maximum cable length 1000 m
Maximum load capacitance 1.5 uF
Nominal voltage 28 VDC
IR interface No
Pass through No
Compatibility All standard M-Bus slaves
Approvals
EMC EN 61000-6-2, EN 61000-6-3
Product Part number Description
CMa30 1050103 USB M-Bus master
ORDERING INFORMATION
CONTACT INFORMATION
Elvaco AB Technical support:
Phone: +46 300 434300
E-mail: support @elvaco.com
Online: www.elvaco.com
TECHNICAL SPECIFICATIONSTROUBLESHOOTING
Green PWR LED is permanently off
Make sure that CMa30 is connected to an active USB port.
Green PWR LED is on but CMa30 is not working
Make sure that the drivers for CMa30 are correctly installed (Windows).
1. Click on ”Start”
2. Right click on ”Computer” and properties.
3. Click on ”Device manager”
4. Expand the tab under Ports (COM & LPT)
5. Check if there is a port called ”Silicon Labs CP210X USB to UART
Bridge”. The line ends with the COM port the device has been
assigned.
6. To ensure which port is used, the USB cable should be plugged
out. The port will then disappear from the list. When reconnecting
the USB cable the port appears in the list again.
7. If the device is not found in the list, the drivers for the device need
to be installed/reinstalled. Download the drivers on http://www.
elvaco.com/en/download/31160
NOTE! The steps 1-3 may look different depending on which version
of Windows you are using. The keyboard shortcut Windows key + R
with the command devmgmt.msc can also be used to start the device
manager. (Press the Windows key and R simultaneously and type
devmgmt.msc in the box that appears.)
CMa30 is working but no slaves are found
1. Make sure that the yellow TX LED is flashing when the scan is
started from the M-Bus software. This is a confirmation that the
correct COM port is selected.
2. Check if the red ERR LED is flashing. This indicates error on the
bus.
3. Check if the red ERR LED is permanently on. This indicates short
circuit or overload of the bus (more than 30 M-Bus loads).
4. Make sure that scanning/reading is made with the correct baud
rate.
SAFETY
The warranty does not cover damage to the product caused by usage
in any other way than described in this manual. Elvaco AB can not be
liable for personal injury or property damage caused by usage in any
other way than described in this manual.
Products:
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