EpiSensor ZHM-20 Bedienungsanleitung
User Guide
Wireless M-Bus Interface
Applies to: ZHM-20, ZHM-21
EPI-085-00
© EpiSensor
Table of Contents
Safety Information 4
Electrical Installation 4
Intended Use 6
Related Documents 6
Introduction 6
M-Bus Communications 6
Configuration 7
Scanning 7
Preset Settings 7
Valid Baud Rates 7
Connection 7
Reading Data 7
Valve Control 8
User Interface 9
Status LED 10
Alt LED 11
Mode Button 11
Install Mode 11
Electrical Installation 12
Mechanical 13
Enclosure & Label Material 13
Mounting Instructions 13
Opening the Enclosure 13
Tamper Evident Seals 14
Compliance 14
Wireless Communications 15
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Safety Information
Please read these instructions carefully before trying to install, operate, service or maintain the ZHM. The
following special notes may appear throughout the user guide (or on the equipment labels) to warn of potential
hazards or to call attention information that clarifies or simplifies a procedure for users.
Symbol
Description
The addition of either symbol to a “Danger” or “Warning” safety label indicates that an
electrical hazard exists which will result in personal injury if the instructions are not
followed.
This is the safety alert symbol. It is used to alert you to potential personal injury hazards.
Obey all safety messages that follow this symbol to avoid possible injury or death.
Electrical Installation
Electrical equipment should be installed, operated, serviced and maintained only by qualified personnel. No
responsibility is assumed by EpiSensor for any consequences arising out of the use of this material.
A qualified person is one who has skills and knowledge related to the construction, installation, and operation of
electrical equipment and has received safety training to recognize and avoid the hazards involved.
Installation, wiring, testing and service must be performed in accordance with all local and national electrical
codes.
HAZARD OF ELECTRIC SHOCK, EXPLOSION, OR ARC FLASH
➔NEVER work alone.
➔Use appropriate personal protective equipment (PPE) and follow safe electrical work practices.
➔Only qualified electrical workers should install this equipment. Such work should be performed only
after reading the entire set of installation instructions.
➔If the equipment is not used in a manner specified by EpiSensor, the protection provided by the
equipment may be impaired.
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➔Before performing visual inspections, tests, or maintenance on this equipment, disconnect all sources
of electric power. Assume that all circuits are live until they have been completely de-energized,
tested, and tagged. Pay particular attention to the design of the power system. Consider all sources of
power, including the possibility of backfeeding.
➔Turn off all power supplying the ZHM and the area in which it is installed before working on it.
➔Always use a properly rated voltage sensing device to confirm that all power is off.
➔Before closing all covers and doors, inspect the work area for tools and objects that may have been
left inside the equipment or panel.
➔When removing or installing metering or other equipment, do not allow it to extend into an energised
bus.
➔The successful operation of this equipment depends upon proper handling,
➔Neglecting fundamental installation requirements may lead to personal injury as well as damage to
electrical equipment or other property.
➔Before performing Dielectric (Hi-Pot) or Megger testing on any equipment in which the energy meter
is installed, disconnect all input and output wires to the ZHM.
➔High voltage testing may damage electronic components contained in the ZHM.
➔Failure to follow these instructions will result in death or serious injury.
Installation & Safety Notes
➔EpiSensor equipment should be installed, operated, serviced and maintained only by qualified
personnel. EpiSensor does not assume any responsibility for any consequences arising out of the use
of this equipment.
➔Fuse for neutral terminal is required if the source neutral connection is not grounded.
➔Clearly label the device’s disconnect circuit mechanism and install it within easy reach of the operator.
➔The fuses / circuit breakers must be rated for the installation voltage and sized for the available fault
current.
➔The ZHM should be installed in a well ventilated location
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Intended Use
Do not use this device for critical control or protection applications where human or equipment safety relies on
the operation of the control circuit. Failure to follow these instructions can result in death, serious injury, or
equipment damage.
Related Documents
Related installation and configuration documents are listed in the following table:
Document
Reference No.
EpiSensor ZHM Datasheet
EPI-066-00
Install Sheet for ZHM-21
EPI-086-00
Install Sheet for ZHM-20
EPI-087-00
Gateway API User Guide
ESE-009-08
Introduction
EpiSensor’s ZHM Wireless M-Bus Interface is designed to make it easy to collect data from a wide range of
heating, cooling and other energy meters using the M-Bus wired communications standard. The ZHM-21 also
includes a relay output that can control a valve, allowing remote shut-off via the API on the EpiSensor Gateway.
The ZHM reports report data through the wireless sensor network to the Gateway, which then manages
bi-directional communications to various compatible software and IoT platforms.
M-Bus Communications
For a full description of the M-Bus specification please see http://www.m-bus.com/. Some specific details that
pertain to the ZHM devices are included here.
The ZHM-2x can be configured to either scan for Slave devices or communicate with a particular device (ZHM-21
only). The ZHM devices will then communicate with one Slave only on the M-Bus network. Depending on how
the ZHM is configured, this will be either the first Slave that the ZHM finds through the scan procedure, or the
device that it has been configured for.
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Configuration
Scanning
The ZHM-2x node scans for devices at Baud Rate 2400 starting at address 1 and proceeding to address 250. If
none are found, it tries all addresses again at Baud 9600 and finally Baud 300. The process restarts and
continues until a slave device is found.
Preset Settings
The ZHM-21 can be pre-configured through the Gateway if either the Baud or Address of the M-Bus device are
known. If one parameter is provided, the other will be scanned - so if a Baud Rate is provided, the 250 addresses
will be scanned at that baud rate only, or if the address is provided it will be scanned across baud rates 2400,
9600 and 300. When both are provided, no scanning is done.
Valid Baud Rates
When preconfiguring the settings on the ZHM-21, the following Baud Rates can be configured; 300, 600, 1200,
2400, 4800 and 9600. Of these, only 300, 2400 and 9600 are listed as recommended.
PARITY is always EVEN and STOP BITS are always 1 for M-Bus communication.
Connection
The connection to the M-Bus slave is done using a 2-core cable. The bus interfaces of the slaves are polarity
independent: that is, the two bus lines can be interchanged without affecting the operation of the slaves.
Besides protection aspects, this also results in simplified installation of the bus system.
Reading Data
The ZHM requests data from the Slave device using the M-Bus REQ_UD2 (Request for Class 2 Data). When the
RSP_UD (Data Transfer from Slave to Master after Request) has been received is it parsed by the ZHM which
then maps particular M-Bus “Value Information Fields” to EpiSensor Sensor IDs. It also converts from value
specific data types to EpiSensor data types.
The mapping is as follows;
M-Bus VIF
Description
Sensor ID
Description
E000 0nnn
Energy, 10(nnn-3) Wh, 0.001Wh to 10000Wh
370
Energy (KWH)
E010 1nnn
Power, 10(nnn-3) W, 0.001W to 10000W
376
Power (W)
E011 1nnn
Volume Flow, 10(nnn-6) m3/h, 0.001l/h to
10000l/h
377
Volume Flow (Litres per Hour)
E101 10nn
Flow Temperature, 10(nn-3)oC, 0.001oC to 1oC
371
Heat Celsius Out (C)
E101 11nn
Return Temperature, 10(nn-3) oC, 0.001oC to 1oC
372
Heat Celsius In (C)
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E110 00nn
Temperature Difference, 10(nn-3) K, 1mK to
1000mK
373
Heat Delta T (Kelvin)
E001 0nnn
Volume, 10(nnn-6) m3, 0.001l to 10000l
374
Volume 1 (litres)
E110 1110
Units for H.C.A. - dimensionless
375
Volume 2
Delta T (Kelvin) is not available from some manufacturers (e.g. Sontex) and is calculated as “Heat Delta T = Heat
Out - Heat In”. Volume 2 is also not available from some manufacturers (e.g. Sontex, Sensus or Kamstrup) and is
ignored.
The M-Bus communications terminals and polarity are shown on the following diagram:
Valve Control
This section of the document has information on the switching capability of the ZHM-21. The relay on the
ZHM-21 can be controlled remotely with a command sent from the Gateway’s web interface, or by sending an
API request to the Gateway.
Connecting a Valve to the Relay
There is a single-channel relay output available on the ZHM-21. This output is designed for remotely controlling
a cut-off valve, and is not intended for switching large electrical loads. The location of the valve control
terminals are shown on the diagram below.
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The switching capability of the ZHM relay is 0.1A at 250V (~ 25 Watts). There is one ‘normally open’ and one
‘normally closed’ connection option. For additional technical information on the relays, like rated voltages,
currents, and type - please check the ZHM datasheet.
User Interface
There are two LED’s and one button on the front panel of the ZHM product range that are used to show the
status of the product and to issue commands. This section describes how to interact with user interface and
what each state means.
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A node must be in “command mode” before users can interact with the product. To put the node in Command
Mode, press and hold the “MODE” button for 2 seconds, then release. At this point, a battery powered node will
switch the LED On Solid, while a mains powered node will flicker the LED and then switch the LED On Solid.
Status LED
The red status LED will flash in different sequences depending on the current state of the ZHM. This table below
lists all possible LED flash sequences and their meaning.
Flash Sequence
Description
Diagram
Heartbeat
The node is operating correctly and has
successfully joined a wireless network.
Inverse Heartbeat
The node is has received valid security keys, but
is not connected to a Gateway.
Square Wave
The node is operating correctly but has lost
contact with the Gateway.
On Solid, or Off
If the LED is On Solid, the node is searching for a
Gateway to join. If it is Off, the node may not be
powered, or there is a problem with the node.
Check the power supply, and if the problem
persists, contact EpiSensor support.
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