elvaco CMa30 USB M-Bus Master User Guide

: September 19, 2024
: elvaco

Table of Contents

CMa30 USB M-Bus Master
Specifications:
Product Usage Instructions:
Installation:
LED Indications:
Troubleshooting:
- Frequently Asked Questions (FAQ):
Q: How many M-Bus slaves can CMa30 handle?
Q: Where can I download drivers for CMa30?

CMa30 USB M-Bus Master

Specifications:

Product Name: CMa30 USB M-Bus master
Designed for mobile use
Supports up to 30 M-Bus slaves
M-Bus 2-wire bus with no polarity

Product Usage Instructions:

Installation:

Download drivers for CMa30 from
here.
Install the drivers on the computer.
Connect CMa30 to the USB port on the computer.
Check the COM port number assigned to the device in the device
manager.

LED Indications:

Green PWR LED: Indicates mains supply
status.
Red ERR LED: Indicates M-Bus 2-wire bus
status.
Yellow RX LED: Indicates communication from
M-Bus slave to computer.
Yellow TX LED: Indicates communication from
computer to M-Bus slaves.

Troubleshooting:

If Green PWR LED is permanently off, ensure CMa30 is connected
to an active USB port.
If Green PWR LED is on but CMa30 is not working, check if
drivers are correctly installed:
Click on Start.
Right-click on Computer and select Properties.
Click on Device Manager.
Expand the Ports (COM & LPT) tab.
Check for a port called Silicon Labs CP210X USB to UART Bridge
to find the COM port assigned to the device.
If not found, download drivers from here.

Frequently Asked Questions (FAQ):

Q: How many M-Bus slaves can CMa30 handle?

A: CMa30 can handle up to 30 M-Bus slaves.

Q: Where can I download drivers for CMa30?

A: Drivers for CMa30 can be downloaded from the Elvaco Knowledge
Base at https://support.elvaco.com/hc/en-us.

CMa30
USB M-Bus master
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 Knowledge Base, https://support.elvaco.com/ hc/en- us.
OVERVIEW
1. USB port 2. PWR LED green 3. ERR LED red 4. RX LED yellow 5. TX LED yellow 6. M-Bus connection

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

INSTALLATION
Drivers for CMa30 have to be installed on the computer before using CMa30. Drivers are available for download at https://support.elvaco.com/hc/en-us/ articles/17439477128221-Installing-drivers.
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.

Short flash every No M-Bus slaves

second

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

TROUBLESHOOTING
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.

ORDERING INFORMATION

Product CMa30

Part number 1050103

Description USB M-Bus master

CONTACT INFORMATION
Elvaco AB Technical support:
E-mail: support @elvaco.com Online: www.elvaco.com

TECHNICAL SPECIFICATIONS

Mechanics Protection class Dimensions Weight Connection M-Bus
Mounting Cable Electrical Power supply Power consumption at 1 T Environmental Operating temperature range Storage temperature range Pollution Operating altitude M-Bus M-Bus standard M-Bus baud rate Maximum connected M-Bus loads Maximum cable length Maximum load capacitance Nominal voltage IR interface Pass through Compatibility Approvals EMC

IP41 98x57x26 mm 95 g Pluggable screw terminal 0.25-2.5 mm² Desktop USB type A-B 0.6 m
USB type B 5 V 500 mA 160 mA
-20 °C to +55 °C
-40 °C to +85 °C Degree 2 0-2000 m
EN 13757 300, 2400 Bit/s 30 (one load is 1.5 mA)
1000 m 1.5 uF 28 VDC No No All standard M-Bus slaves
EN 61000-6-2, EN 61000-6-3

Elvaco AB, Kabelgatan 2T, S-43437 Kungsbacka, Sweden

© 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: 3.1