Modbus-RTU

Datasheet

 

IQ Home Modbus-RTU Master

MB-RTU-01 Datasheet


Contents

​1.​ Introduction  3

​1.1.​ Typical usage  3

​2.​ Product models  4

​2.1.​ Key features  4

​3.​ Specifications  5

​4.​ Dimensions and Setup  6

​4.1.​ Add or remove device from the RF network  7

​4.1.1.​ Add device to the RF network (Bonding)  7

​4.1.2.​ Remove device from the RF network with user button (Unbonding)  7

​4.2.​ RS-485  8

​4.2.1.​ RS485 communication specification  8

​4.2.3.​ Typical Connections  9

​4.2.3.1.​ One device  9

​4.2.3.2.​ More devices  9

​4.3.​ Mount on DIN Rail  10

​5.​ For your safety  11

​5.1.​ WARNINGS  11

​5.2.​ Notices  12

​6.​ Contact Us  12


​1.​ Introduction

IQ Home ModBus-RTU master device enable to access ModBus-RTU slave devices over IQRF Network. Using Modbus-RTU master device user are able to send Modbus RTU request and receive Modbus RTU responses. The Modbus-RTU master device bridge the IQRF Network and the RS-485 communication Modbus-RTU network. The device implements slave role on IQRF Network side and Master role on RS-485 Modbus-RTU network side. ModBus-RTU master device can handle up to 31 slave devices on RS-485 Modbus-RTU network side.

​1.1.​ Typical usage

With IQ Home ModBus-RTU master device the user can access and control ModBus-RTU devices from cloud.

Typical request data flow:

Cloud Software ➡️ [Internet connection / MQTT protocol] ➡️ IQ Home Gateway ➡️ [IQRF Network] ➡️ IQ Home ModBus RTU Master ➡️ [Modbus RTU on RS485] ➡️ Modbus slave device

Typical response data flow:

Modbus slave device ➡️ [Modbus RTU on RS485] ➡️ IQ Home ModBus RTU Master ➡️ [IQRF Network] ➡️ IQ Home Gateway ➡️ [Internet connection / MQTT protocol] ➡️ Cloud Software

Next pictures show the typical usage architecture:

[a]

​2.​ Product models

Model ID

Product name

RS-485

MB-RTU-01

ModBus-RTU master device

​2.1.​ Key features

  • Modbus-RTU device calculates and checks the CRC-16 error check fields. Users don’t need to care about it.
  • Modbus-RTU master device can address up to 31 slave devices. From slave device address 0x01 to 0x1F.
  • Modbus-RTU master device can send broadcast message. Broadcast address is 0x00.
  • Automatic Time-Out control. Modbus-RTU master device generate time-out response, if the device don’t receives any response from slave device.
  • Automatic Request resend mechanism. Modbus-RTU master device automatically re-sends the Modbus-RTU request, if the device don’t receives any response or receives corrupted response from slave device.
  • Modbus-RTU master device communicate with two different mode:
  • default: 1 start bit 8 data bits  -> least significant bit sent first ->

1 bit for Even parity -> 1 stop bit

  • 1 start bit -> 8 data bits -> least significant bit sent first -> 2 stop bits (no parity)
  • Modbus-RTU master device can communicate with different Baud rates. Supported Baud rates:
  • 1200, 2400, 4800, default: 9600, 19200, 38400, 57600, 115200

​3.​ Specifications

RF Specification

Communication technology

IQRF - DPA

Communication module

DCTR-76DA

IQRF-OS version

4.02D

Antenna

Internal, PCB

Local state feedback

Power on

PWR is lighting

Active RS-485 communication

CMD is blinking

Active RF communication

RF is blinking

Environmental conditions

Storage temperature

from -40°C to +85°C

Operation temperature

from -40 °C to +85 °C

Relative humidity

from 10 % to 85 %

Electrical specification

Input voltage - AC

85-265 VAC (47-63 Hz) or 120-370 VDC

Galvanic isolation

Main power is galvanic isolated from RS-485 bus

Power consumption

<0.5W

[b]

Mechanical and enclosure specification

Product dimension (outline)

Box 33,5mm(W) x 65,2mm(D) x 90mm(H)

Mount type

Din Rail mountable

Enclosure material

ABS

Body colour

Light gray

Product weight

90 g

Enclosure protection level

IP35

All setup should be examined by a qualified technician!


​4.​ Dimensions and Setup

​4.1.​ Add or remove device from the RF network

The device can be add/remove from network with the PAIR button.

​4.1.1.​ Add device to the RF network (Bonding)    

To use DPA, all Nodes in the network must be bonded to the Coordinator.

In case the Node is already bonded the red LED once shortly flashes after power on.

If the node is not bonded the red LED is flashing continuously.

To bond node during bond period press the user pushbutton and the node going to bond.

​4.1.2.​ Remove device from the RF network with user button (Unbonding)

  1. Push the pair button and hold it.
  2. The CMD led is lighting and the RF led is flashing.
  3. You have to hold it until the CMD led turn off for the second time.
  4. Release the button and the device is unbonding.


​4.2.​ RS-485

120 Ohm termination resistor is mounted in the device.

​4.2.1.​ RS485 communication specification

Bus type

RS485

Protocol

MODBUS RTU with 16 bit CRC

Baud rate

1200, 2400, 4800, 9600 (default)

Address range

0-47 user settable

Maximum bus load

60 meters per bus*

Range

≤1000m

*Note that the maximum number of meters is dependent on the converter, baud rate (the higher the baud rate the smaller the number of meters which can be used) and the circumstances under which the meters are installed.


​4.2.3.​ Typical Connections

​4.2.3.1.​ One device

​4.2.3.2.​ More devices


​4.3.​ Mount on DIN Rail

Mount as shown in figure only, with input terminals down, or else sufficient cooling will not be possible.

Admissible DIN rail:TS35/7.5 or TS35/15

For rail fastening:

  1. Tilt the unit slightly rearwards.
  2. Fit the unit over top hat rail.
  3. Slide it downward until it hits the stop.
  4. Press against the bottom for locking.
  5. Shake the unit slightly to check the locking action.


​5.​ For your safety

To prevent damage to your product or injury to yourself or to others, read the following safety precautions before using this equipment. Keep these safety instructions where all those who use the product will read them.

​5.1.​ WARNINGS


​5.2.​ Notices

This symbol indicates that this product is to be collected separately.

This symbol on the battery indicates that the battery is to be collected separately.

  • This product is designated for separate collection at an appropriate collection point. Do not dispose of as household waste.
  • For more information, contact the retailer or the local authorities in charge of waste management.

  • All batteries whether marked with this symbol or not, are designated for separate collection at an appropriate collection point.
  • Do not dispose of as household waste. For more information, contact the retailer or the local authorities in charge of waste management.

 

​6.​ Contact Us

IQ HOME Kft.

Address: 1139 Budapest, Forgách utca 32. 5. ép. 3. em. 312., Hungary

Email: info@iqhome.org

Website: www.iqhome.org

©2018 IQHome Kft

www.iqhome.org

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[a]Az új képet be kell rakni.

[b]Relés Modul kevesebb mint 1.5W