iSMA iSMA-B-W0202 User manual

www.ismacontrolli.com
DMP263en | 1st Issue rev. 3 | 05/2022
iSMA-B-W0202
User Manual
Wireless Modbus RTU/ASCII



iSMA-B-W0202 User Manual
www.ismacontrolli.com
DMP263en | 1st Issue rev. 3 | 05/2022
page 2 of 41
Table of Contents
1 Introduction ........................................................................................................................... 4
1.1 Revision History............................................................................................................................. 5
2 Safety Rules............................................................................................................................ 6
3 Technical Specification ........................................................................................................ 7
4 Hardware Specification ....................................................................................................... 9
4.1 Dimensions .................................................................................................................................... 9
4.2 Power Supply................................................................................................................................. 9
4.2.1 DC Voltage................................................................................................................................ 9
4.2.2 AC Voltage ................................................................................................................................ 9
4.3 Front Panel...................................................................................................................................10
4.4 RS485 Communication..............................................................................................................10
4.4.1 Grounding and Shielding....................................................................................................10
4.4.2 Network Termination...........................................................................................................11
5 Inputs and Outputs............................................................................................................12
5.1 Special Inputs ..............................................................................................................................12
5.1.1 Voltage Measurement (0-10 V).......................................................................................... 12
5.1.2 Temperature Measurement ..............................................................................................12
5.1.3 Dry Contact ............................................................................................................................13
5.2 Digital Outputs ............................................................................................................................13
5.2.1 Solenoid Valve .......................................................................................................................13
5.2.2 Resistive Load........................................................................................................................14
6 Configuration.......................................................................................................................15
6.1 Communication...........................................................................................................................15
6.2 Special Inputs ..............................................................................................................................15
6.3 Digital Outputs ............................................................................................................................16
6.4 Radio Settings..............................................................................................................................16
6.5 Radio Status.................................................................................................................................17
7 Modbus Registers...............................................................................................................18
7.1 Configuration Registers.............................................................................................................18
7.1.1 Firmware Version and Module Type (30001)................................................................. 18
7.1.2 Counter of Received Messages (30004)..........................................................................18
7.1.3 Counter of Error Messages (30006).................................................................................18
7.1.4 Counter of Sent Messages (30008)..................................................................................18
7.1.5 Up Time (30012) ................................................................................................................... 18
7.1.6 Device Actions (40001)........................................................................................................19

iSMA-B-W0202 User Manual
www.ismacontrolli.com
DMP263en | 1st Issue rev. 3 | 05/2022
page 3 of 41
7.1.7 Modbus Protocol Type (40134)......................................................................................... 19
7.1.8 Modbus Address (40135) ................................................................................................... 19
7.1.9 Baud Rate (40136)................................................................................................................19
7.1.10 Stop Bits (40137) ..................................................................................................................20
7.1.11 Data Bits (40138) ..................................................................................................................20
7.1.12 Parity Bit (40139) .................................................................................................................. 20
7.1.13 Response Delay Time (40140)...........................................................................................21
7.1.14 Watchdog Time (40141)...................................................................................................... 21
7.2 Radio Configuration Registers.................................................................................................21
7.2.1 Radio TX Power (40242)......................................................................................................21
7.2.2 Radio Channel (40243)........................................................................................................ 22
7.2.3 Radio Baud Rate (40244) .................................................................................................... 22
7.2.4 Radio AESKEY (40249-40256)............................................................................................23
7.2.5 Radio Received Frames Counter (40257) ....................................................................... 24
7.2.6 Radio ERROR Frames Counter (40259)........................................................................... 24
7.2.7 Radio Transmitted Frames Counter (40261) ................................................................. 24
7.2.8 Wireless Device Status (40263-40390)............................................................................ 24
7.3 Special Inputs Registers ............................................................................................................25
7.3.1 Status of Special Inputs Working as Digital Inputs (30017)........................................25
7.3.2 Special Input Voltage Measurement 1-2 (30071, 30073) ........................................... 25
7.3.3 Special Input Temperature Measurement 1-2 (30072, 30074) ................................26
7.3.4 Special Input Resistance Measurement 1-2 (30103-30104, 30105-30106) .......... 26
7.3.5 Fast Counter (40023-40024, 40025-40026) .................................................................. 26
7.3.6 Resetting Counters Values (40022)..................................................................................26
7.3.7 Special Input Configuration 1-2 (40151-40152)............................................................ 27
7.3.8 Filter Time of Special Input 1-2 (40159-40160)............................................................. 27
7.4 Digital Outputs Registers ..........................................................................................................28
7.4.1 State of Digital Outputs (40018) ....................................................................................... 28
7.4.2 Default State of Digital Outputs (40143).........................................................................28
7.5 Special Application Modes .......................................................................................................28
7.5.1 Operation Mode Registers (40176,40180).....................................................................29
7.5.2 Command Register (40020) ............................................................................................... 32
7.5.3 Block Inputs Register (40021)............................................................................................33
7.5.4 Setpoint Registers (40178, 40182) ................................................................................... 33
7.5.5 Differential Registers (40179, 40183) .............................................................................. 33
8 List of Modbus Registers ..................................................................................................34

iSMA-B-W0202 User Manual
www.ismacontrolli.com
DMP263en | 1st Issue rev. 3 | 05/2022
page 4 of 41
•
•
•
1 Introduction
The iSMA-B-W0202 has been built as an extension of Modbus serial bus by using wireless
technology, wherever the use of network cable is impossible or unprofitable. Using two
iSMA-B-W0202 modules allows to build a wireless 'bridge' for the RS485 by building
wireless remote island (one or more) for devices, which communicate via Modbus RTU/
ASCII, e.g., iSMA-B-MIX18 or iSMA-B-MIX38.
The iSMA-B-W0202 (in addition to the RS485 port and wireless port) is equipped with 2
special inputs and 2 digital outputs (max. 230 V AC/30 V DC, 3 A). It allows to use the
device as an I/O module or light controller communicating with Modbus RTU/ASCII.
Algorithm implemented in the processor allows the user to choose one of the three
different modes:
Modbus Bridge;
Modbus Bridge and I/O module (digital outputs work independent to special inputs);
Modbus Bridge and light controller (digital output states depend on assigned special
inputs). There are different operating modes available (see Special Application Modes
section).
The iSMA-B-W0202 is also equipped with a micro USB port, which allows to configure the
device without the use of an external power supply (the device is powered through the
USB port). This solution gives the user an easy way, using 2 laptops, to carry out the tests
within the existing facility.
Figure 1. iSMA-B-W0202 wireless module

iSMA-B-W0202 User Manual
www.ismacontrolli.com
DMP263en | 1st Issue rev. 3 | 05/2022
page 5 of 41
•
•
•
•
•
•
•
1.1 Revision History
Rev. Date Description
1.0 28 Apr 2015 First edition
1.1 29 Dec 2016 New HVAC functions Heating and Cooling based on output
thermostatic control with a setpoint and differential value
setting;
Added new input mode Time Relay NC [ms], Time Relay
NO and NC in seconds, Input Forwarding;
Added new input mode: Ordinary IO, Monostable Relay,
Bistable Relay, Time Relay NO and NC [ms], Time Relay NO
and NC in seconds, Input Forwarding, Heating, Cooling with
corresponding Modbus registers;
Added reset output to default after input mode change;
Added power Led flashing after I/O watchdog triggered;
Changed I/O watchdog reset after read/write registers
through USB;
Added immediately detecting sensors short circuit and
disconnection regardless of filter settings on universal
inputs.
1.2 17 Dec 2018 Added watchdog functionality for the Radio, if the radio does not
receive the correct packet for 180 seconds, the radio module will
restart.
1.3 25 May 2022 Rebranded
Table 1. Revision history

iSMA-B-W0202 User Manual
www.ismacontrolli.com
DMP263en | 1st Issue rev. 3 | 05/2022
page 6 of 41
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
2 Safety Rules
Improper wiring of the product can damage it and lead to other hazards. Make sure
that the product has been correctly wired before turning the power on.
Before wiring or removing/mounting the product, make sure to turn the power off.
Failure to do so might cause an electric shock.
Do not touch electrically charged parts such as power terminals. Doing so might cause
an electric shock.
Do not disassemble the product. Doing so might cause an electric shock or faulty
operation.
Use the product only within the operating ranges recommended in the specification
(temperature, humidity, voltage, shock, mounting direction, atmosphere, etc.). Failure
to do so might cause a fire or faulty operation.
Firmly tighten the wires to the terminal. Failure to do so might cause a fire.
Avoid installing the product in close proximity to high-power electrical devices and
cables, inductive loads, and switching devices. Proximity of such objects may cause an
uncontrolled interference, resulting in an instable operation of the product.
Proper arrangement of the power and signal cabling affects the operation of the entire
control system. Avoid laying the power and signal wiring in parallel cable trays. It can
cause interferences in monitored and control signals.
It is recommended to power controllers/modules with AC/DC power suppliers. They
provide better and more stable insulation for devices compared to AC/AC transformer
systems, which transmit disturbances and transient phenomena like surges and bursts
to devices. They also isolate products from inductive phenomena from other
transformers and loads.
Power supply systems for the product should be protected by external devices limiting
overvoltage and effects of lightning discharges.
Avoid powering the product and its controlled/monitored devices, especially high
power and inductive loads, from a single power source. Powering devices from a single
power source causes a risk of introducing disturbances from the loads to the control
devices.
If an AC/AC transformer is used to supply control devices, it is strongly recommended
to use a maximum 100 VA Class 2 transformer to avoid unwanted inductive effects,
which are dangerous for devices.
Long monitoring and control lines may cause loops in connection with the shared
power supply, causing disturbances in the operation of devices, including external
communication. It is recommended to use galvanic separators.
To protect signal and communication lines against external electromagnetic
interferences, use properly grounded shielded cables and ferrite beads.
Switching the digital output relays of large (exceeding specification) inductive loads can
cause interference pulses to the electronics installed inside the product. Therefore, it
is recommended to use external relays/contactors, etc. to switch such loads. The use
of controllers with triac outputs also limits similar overvoltage phenomena.
Many cases of disturbances and overvoltage in control systems are generated by
switched, inductive loads supplied by alternating mains voltage (AC 120/230 V). If they
do not have appropriate built-in noise reduction circuits, it is recommended to use
external circuits such as snubbers, varistors, or protection diodes to limit these effects.

iSMA-B-W0202 User Manual
www.ismacontrolli.com
DMP263en | 1st Issue rev. 3 | 05/2022
page 7 of 41
3 Technical Specification
Power Supply Voltage 24 V AC/DC ± 20%
Power consumption 2 W at 24 V DC; 4.5 VA at 24 V AC
Special Inputs Number of inputs 2
Temperature input Measurement with attached RTDS
Accuracy ±0.1˚C at 25˚C
Voltage input Voltage measurement from 0 to 10 V
Input impedance 100 kΩ
Measurement accuracy ±50 mV
Resistive input Measurement of resistance from 0 to
1000 kΩ
Resistance measurement
method
Voltage divider
Dry contact input Output current ~1 mA
Measurement resolution 12-bits
Fast counters 50 Hz/100 Hz
Digital Outputs (Relays) Number of outputs 2
Resistive load 3 A at 230 V AC or 3 A at 30 V DC
Inductive load 75 VA at 230 V AC or 30 W at 30 V DC
Interface Mini USB For power up and configuration
RS485 Up to 128 devices
Communication protocol Modbus RTU, Modbus ASCII
Baud rate From 1200 to 115200 bits/s
Address 0 to 127
Radio Frequency 868 MHz
Max output power +20 dBm (100 mW)
Sensitivity -120 dBm
Radio channels 1÷8
Encryption AES-128
Baud rate From 1200 to 200000 bits/s

iSMA-B-W0202 User Manual
www.ismacontrolli.com
DMP263en | 1st Issue rev. 3 | 05/2022
page 8 of 41
External antenna SMA socket
Ingress Protection IP IP40
Temperature Storage -40˚C to +85˚C
Operating -10˚C to +50˚C
Humidity Relative 5 to 95%
Connectors Type Rising clamp
Maximum cable size 2.5 mm2
Dimension Width 17 mm
Length 56 mm
Height 90 mm
Table 2. Technical specification

iSMA-B-W0202 User Manual
www.ismacontrolli.com
DMP263en | 1st Issue rev. 3 | 05/2022
page 9 of 41
4 Hardware Specification
4.1 Dimensions
Figure 2. iSMA-B-W0202 dimensions
4.2 Power Supply
4.2.1 DC Voltage
Figure 3. DC voltage
4.2.2 AC Voltage
Figure 4. AC voltage

iSMA-B-W0202 User Manual
www.ismacontrolli.com
DMP263en | 1st Issue rev. 3 | 05/2022
page 10 of 41
•
•
•
•
•
•
•
4.3 Front Panel
Figure 5. Front panel
The power LED (ON) is on (green) if the module is running properly;
The communication LED (TX) is on (orange) for 20 ms after sending each message. If
the module receives/sends a lot of messages, the LED can be lit continuously;
LEDs indicating the status of special inputs (S1-S2) are lit (green) if resistance
connected to the input is less than 1 kΩ (dry contact input is active);
LEDs indicating the status of digital outputs (O1-O2) are lit (orange) if the output is
enabled.
4.4 RS485 Communication
Figure 6. RS485 connection
4.4.1 Grounding and Shielding
In most cases controllers are installed in enclosures along with other devices, which
generate electromagnetic radiation (for example, relays, contactors, transformers, motor
invertors, etc.). Such electromagnetic radiation can induce electrical noise into both
power and signal lines, as well as direct radiation into the controller, causing negative
effects on the system. For this reason, an appropriate grounding, shielding, and other
protective steps should be taken at the installation stage to prevent negative
electromagnetic radiation effects, for example:
control cabinet grounding;
cable shield grounding;
using protective elements for electromagnetic switching devices;
WARNING!
The LED also lights up if voltage connected to the input has a very low potential.

iSMA-B-W0202 User Manual
www.ismacontrolli.com
DMP263en | 1st Issue rev. 3 | 05/2022
page 11 of 41
•
•
•
proper wiring;
consideration of cable types and their cross sections;
and other.
4.4.2 Network Termination
Transmission line effects often present problems for data communication networks.
These problems include reflections and signal attenuation.
To eliminate the presence of reflections of signal from the end of the cable, the cable
must be terminated at both ends with a resistor across the line adequate to its
characteristic impedance. Both ends must be terminated since the propagation is
bidirectional. In case of an RS485 twisted pair cable this termination is typically 120 Ω.

iSMA-B-W0202 User Manual
www.ismacontrolli.com
DMP263en | 1st Issue rev. 3 | 05/2022
page 12 of 41
•
•
5 Inputs and Outputs
The iSMA-B-W0202 module is equipped with:
2 special inputs;
2 digital outputs.
5.1 Special Inputs
5.1.1 Voltage Measurement (0-10 V)
Figure 7. A special input voltage connection
5.1.2 Temperature Measurement
Figure 8. A special input temperature connection

iSMA-B-W0202 User Manual
www.ismacontrolli.com
DMP263en | 1st Issue rev. 3 | 05/2022
page 13 of 41
5.1.3 Dry Contact
Figure 9. A special input dry contact connection
5.2 Digital Outputs
5.2.1 Solenoid Valve
Figure 10. A solenoid valve connection

iSMA-B-W0202 User Manual
www.ismacontrolli.com
DMP263en | 1st Issue rev. 3 | 05/2022
page 14 of 41
5.2.2 Resistive Load
Figure 11. A resistive load connection

iSMA-B-W0202 User Manual
www.ismacontrolli.com
DMP263en | 1st Issue rev. 3 | 05/2022
page 15 of 41
6 Configuration
The iSMA-B-W0202 can be configured using Modbus registers or directly by USB
connection and iSMA Configurator software. The iSMA Configurator can be downloaded
from ismacontrolli.com. If the module is connected, it appears in the hierarchy tree
window (left part of the screen). The next step is to read module configuration using the
Read Module button or to read configuration from a file using the Load From File button.
To save changes in the module, use the Write Module button. This command writes all
parameters to the module.
6.1 Communication
The screen below shows configuration options for RS485 bus.
Figure 12. Communication options
6.2 Special Inputs
The screen below shows configuration options for special inputs.
WARNING!
Radio settings only take effect after the module restarting.

iSMA-B-W0202 User Manual
www.ismacontrolli.com
DMP263en | 1st Issue rev. 3 | 05/2022
page 16 of 41
Figure 13. Special inputs configuration
6.3 Digital Outputs
The screen below shows configuration options for digital outputs.
Figure 14. Digital outputs configuration
6.4 Radio Settings
The screen below shows configuration options for radio.

iSMA-B-W0202 User Manual
www.ismacontrolli.com
DMP263en | 1st Issue rev. 3 | 05/2022
page 17 of 41
Figure 15. Radio settings
6.5 Radio Status
The screen below shows radio status for all devices working in the same group.
Figure 16. Radio status

iSMA-B-W0202 User Manual
www.ismacontrolli.com
DMP263en | 1st Issue rev. 3 | 05/2022
page 18 of 41
7 Modbus Registers
This section outlines all Modbus registers available in the iSMA-B-W0202 wireless module.
7.1 Configuration Registers
7.1.1 Firmware Version and Module Type (30001)
The register contains type and firmware version of module.
Low byte contains information about the type of module in accordance with the table
below:
Value Type
8010 (0x5016) iSMA-B-W0202
Table 3. Firmware version and module type
High byte contains the module firmware version multiplied by 10.
For example:
In the 30001 register the number is 2049010 = 0x500A16. It means that it is a module
iSMA-B-W0202 (0x50) with firmware in version 1.0 (0x0A16 = 1010).
7.1.2 Counter of Received Messages (30004)
The 32-bit register with the number of valid Modbus messages received by the module
from the last power up. The value is reset after a power cycle or after changing
transmission parameters (baud rate, stop bits, parity, etc.).
7.1.3 Counter of Error Messages (30006)
The 32-bit register with the number of error Modbus messages received by the module
from last power up. The value is reset after a power cycle or after changing transmission
parameters (baud rate, stop bits, parity, etc.).
7.1.4 Counter of Sent Messages (30008)
The 32-bit register with the number of Modbus messages sent by the module from last
power up. The value is reset after a power cycle or after changing transmission
parameters (baud rate, stop bits, parity, etc.).
7.1.5 Up Time (30012)
The 32-bits register contains module working time in seconds from last power up or
module reset.
WARNING!
Changing parameters concerning the transmission configuration will only take effect
after restarting the module or reload settings–register (40001).

iSMA-B-W0202 User Manual
www.ismacontrolli.com
DMP263en | 1st Issue rev. 3 | 05/2022
page 19 of 41
7.1.6 Device Actions (40001)
Setting the 40001 register according to the table below enables 1 of 3 available actions:
reset module, reload settings, and set to default.
Value Type of Action
0x01FF Reset of device
0x02FF Reload settings (RS485, Radio)
0x03FF Set device to default
Table 4. Device actions
7.1.7 Modbus Protocol Type (40134)
The register contains parameters, which define the Modbus protocol type (RTU or ASCII).
Value Protocol Type
0 (default) Modbus RTU
1 Modbus ASCII
Table 5. The Modbus Protocol Type register
7.1.8 Modbus Address (40135)
The register contains information about the Modbus address of the module. The default
address is 1.
7.1.9 Baud Rate (40136)
The register contains information about the baud rate.
Particular register value determines the baud rate in accordance with the table below.
Value Baud Rate
0 1200
1 2400
2 4800
3 9600
4 19200
5 38400
6 57600

iSMA-B-W0202 User Manual
www.ismacontrolli.com
DMP263en | 1st Issue rev. 3 | 05/2022
page 20 of 41
Value Baud Rate
7 115200 (default)
Table 6. Baud rate
7.1.10 Stop Bits (40137)
The value of the register determines the number of stop bits in accordance with the
following table:
Value No. of Stop Bits
1 (default) 1
2 2
Table 7. Stop bits
Figure 17. Modbus frame
7.1.11 Data Bits (40138)
The value of the register determines the number of data bits transmitted in a single byte
according to the following table:
Value No. of Data Bits
7 7
8 (default) 8
Table 8. Data bits
7.1.12 Parity Bit (40139)
Each byte of data being transferred may be additionally protected with a parity bit added
before stop bit (bits).
The method of calculating parity bit is determined according to the following table:
Register Value Type of Parity Bit
0 (default) None
1 Odd (number of all ones in a byte is odd)