Humidity and Temperature Transmitter Specification modbus EN V1.0.pdfThe temperature is below 0 o C...

USR-HTW User Manual www.usr.so

Jinan USR IOT Technology Limited 1 / 20 [email protected]

Humidity and Temperature Transmitter

Specification

USR-HTW(Modbus) Version: V1.0

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Content

1. Product Introduction ....................................................................................................................... 3

1.1 Product Description ................................................................................................................... 3

1.2 Details .................................................................................................................................... 3

1.3 Indicator and Key Function.......................................................................................................... 4

2. Instructions for Use ........................................................................................................................ 4

2.1 Connect to local router ............................................................................................................... 5

2.2 How to communicate with HTW ................................................................................................... 8

2.2.1 communication in the same local area network ........................................................................ 8

2.2.2 communication in the wide area network ............................................................................. 14

3. Modbus protocol .......................................................................................................................... 15

3.1 MODBUS Addressing rules ....................................................................................................... 15

3.2 MODBUS frame description ...................................................................................................... 16

3.3 Data Encoding ........................................................................................................................ 16

3.4 communication examples .......................................................................................................... 17

3.5 MODBUS exceptional response.................................................................................................. 18

4. ASCII code command ................................................................................................................... 19

READ .................................................................................................................................. 19

AUTO.................................................................................................................................. 19

STOP .................................................................................................................................. 19

Contact Information ............................................................................................................................ 19

Disclaimer ........................................................................................................................................ 20

Update History ................................................................................................................................... 20

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1. Product Introduction

1.1 Product Description

USR-HTW(Modbus) is wireless temperature and humidity transmitter, which supports Modbus

RTU mode protocol. This product uses high-quality capacitive digital temperature and humidity sensor,

which features high accuracy, strong immunity from interference, high reliability and stability.

Multiple devices (up to 247 devices) can be connected to one monitor software through virtual

serial software just like Modbus protocol realized over real serial line（RS232 or RS485）, which

reduces the complexity of system building, increases the communication distance.

1.2 Details

Table.1 USR-HTW Parameter

Mechanical

Dimensions

86*86*28mm（L*W*H）

Working voltage

range

DC 5-24V

Power consumption Typical：1W Max: 2W

Working temperature -20-70°C

Working humidity 0～99.9%RH (Non-condensing)

Temperature

measuring range

-40-80°C

Temperature

measuring accuracy

±0.4℃

Temperature

measuring resolution

0.1℃

Humidity measuring

range

0~99.9%RH

Humidity measuring

accuracy

±2%RH （25℃）

Humidity measuring

resolution

0.1%RH

Installation wall mounting type

Preservation

environment

temperature : 10-40°C

Humidity: <60%RH

Packing List USR-HTW*1

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Table.2 Default settings

Network Mode AP

AP SSID USR-HTW

AP Password null

Device Name USR-HTW

Device Password admin

Webpage address in AP mode 10.10.100.254

Account / Password of Webpage Account : admin

Password: the same to Device

Password

Typical applications:

Communication base stations, archives, warehouses, labs, factories, workshops, machine

rooms, museums, libraries, hospitals, hotels, restaurants, houses and so on.

1.3 Indicator and Key Function

A. Indicator

Red indicator : On when the USR-HTW works nomally;

Blinks when press on refresh key for a long time, indicates for what action is doing with

different frequencies;

Blue indicator : Network connection status indicator.

B. Refresh key

Short Press(0~3s): Refresh the value of humidity and temperature.

Long press(5s-10s):

Release the key when the red indictor light blinks slowly, the device will return to

default factory settings. After 10s about, it will work again.

Long press(5s-10s):

Release the key when the red indictor light blinks quickly, slave’s ID(unique address)

will display on the screen.

C. Temperature max:

Display the max value in last 1 hour after you press it.

D. Temperature min:

Display the min value in last 1 hour after you press it.

E. Humidity max:

Display the max value in last 1 hour after you press it.

F. Humidity min:

Display the min value in last 1 hour after you press it.

2. Instructions for Use

Supply the USR-HTW with a DC power 5V, up to 24V.

Note : ‘+’ represents positive, ‘-’ represents negative i.e. ground.

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2.1 Connect to local router

Connect with the wireless router via Webpage configuration. Other computer operating systems refer to this

process. The configuration requires a wireless network card on computer.

1. AP mode is default work mode. After the HTW work, click wireless network button to get the

wireless list.

2. Find “USR-HTW” and connect.

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3. Open the Webpage of HTW, IP address: 10.10.100.254.

4. Input the account and password, default: admin, admin.

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5. Click Scan router to get the router information list, and then select the router you want to connect,

click OK。

6. Input router passwords, save .

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7. Restart HTW.

HTW will connect to the router automatically after restart, the blue indicator will light up.

2.2 How to communicate with HTW

2.2.1 communication in the same local area network

After you operate following section 2.1, HTW has joined the local router, now be sure your computer is

in the same router.

1. Users should set IP of your computer to static IP.

2. Install virtual serial port software.

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3. Open the virtual serial port software. click on “add com”button, popup dialog box,

choose an com port that not used by other devices. Net protocol select TCP server, local port input

8899,click OK. It is not necessary to care about baud rate. The software can deal with it. The

software just tranfer date transparently no matter what baud rate it uses, no matter what checking

pattern it uses, no matter how many stop bits it uses.

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4. Open USR-HTW configuration tools, product application mode select Modbus, target server address

or domain input computers static IP address, target server port input 8899, click search button, click

the HTW you want to set, then click set target server button. If you set successfully, it will return ok.

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By the way, if you have done this configuration, you can’t use it by LonHand software, if you want

use LonHand software again ,just reset it.

Now you can see the HTW device have connect to computer by virtual COM5. You can add up to

247 devices(depending on the modbus slave address range) to this COM5 port.

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5. Set USR-HTW ID i.e. slave address. Because our product have been set ID 17 when it is produced,

if you need more than on device to build your own monitor system of humidity and temperature, you

need change this default ID,1-247 except 17 will be fine. The command format should conform to

Modbus protocol, which is introduced in section 3.4. You also need an assistant tool supplied by our

company.

Portnum choose COM5 you have set by virtual serial port software, other parameters default. Click

open button. Send options you should select send as Hex, as shown above. For example , we set ID

as 80(0x50). Don’t forget CRC checking code.

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You can monitor data communication by virtual serial port softeware, for example we obtain data of

humidity and temperature constantly by sending commands through serial port. Just click monitor

button on the tool colum.

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2.2.2 communication in the wide area network

If your computer and device(HTW) are in different network segment that in wide area net work, you need

map your computer out by local router. Thus your router should support virtual servers setting or NAT setting.

And you also need another laptop to set the USR-HTW just as bellow. This laptop is in the same router with

HTW. Product application mode column select Modbus, target server address or domain set column input

your computer IP, target server port input server port. NOTE: you must pay attention to server port, which is

allocated by your router, and to local port which is allocated by your computer. You must distinguish this two

ports.60000 is sever port and 8899 is local port.

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3. Modbus protocol

3.1 MODBUS Addressing rules

The MODBUS addressing space comprises 256 different addresses.

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The Address 0 is reserved as the broadcast address. All slave nodes must recognise the broadcast

address.

The MODBUS Master node has no specific address, only the slave nodes must have an address. This

address must be unique on a MODBUS serial bus.

3.2 MODBUS frame description

The MODBUS protocol defines a simple protocol data unit (PDU) independent of the underlying

communication layers.

The mapping of MODBUS protocol on a specific bus or network introduces some additional fields

on the Protocol Data Unit. The client that initiates a MODBUS transaction builds the MODBUS PDU,

and then adds fields in order to build the appropriate communication PDU.

For more informations, please visit http://www.modbus.org. Our product supports Modbus RTU

mode.

USR-HTW supports function codes as bellow:

‘0x03’,’0x04’: read data of humidity and temperature(optional humidity&temperature or humidity

or temperature)

‘0x06’: set the slave address (ID).

‘0x6E’: customized function code. When master send this function code by broadcast (address 0),

the device will reset ID to factory Default setting (17).

Table Internal Registers address mapping

Register name address

humidity 0x0000

temperature 0x0001

reserved 0x0002-0x0005

Device ID 0x000A

3.3 Data Encoding

MODBUS uses a ‘big-Endian’ representation for addresses and data items. This means that when a

numerical quantity larger than a single byte is transmitted, the most significant byte is sent first. So for

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http://www.modbus.org/



example

Register size value

16 – bits 0x1234 the first byte sent is 0x12 then 0x34

3.4 communication examples

Read value of humidity and temperature

Request: 0x11 0x03 0x00 0x00 0x00 0x02 0xC6 0x9B

Master send Content Byte count comment

Slave ID 0x11 1

Function code 0x03 1 Read Registers

Starting Address 0x0000 2 High half-word first

Quantity of Registers 0x0002 2 High half-word first

CRC check 0xC69B 2 High half-word first

Response: 0x11 0x03 0x04 0x01 0xF2 0x00 0xF2 0xCA 0x78

Slave send Content Byte count comment

Slave ID 0x11 1


Byte count 0x04 1 Return byte count of registers

Register 0 0x01F2 2 Humidity value

Register 1 0x00F2 2 Temperature value

CRC check 0xCA78 2

The temperature is below 0 o

C if the MSB of temperature value is 1, great than 0 o

C if the MSB of

temperature value is 0. The obtained value is 10 times of real value. For example, humidity’s value

0x01F2, that is 498 in decimal. The real humidity is 49.8%RH. Temperature’s value is 0x00F2, that is

242 in decimal. The real temperature is 24.2 o

C.

Read value of humidity

Request: 0x11 0x03 0x00 0x00 0x00 0x01 0x86 0x9A


Slave ID 0x11 1




CRC check 0x869A 2 High half-word first

Response: 0x11 0x03 0x02 0x01 0xF2 0xF9 0x92


Slave ID 0x11 1



Register 0 0x01F2 2 Humidity value

CRC check 0xF992 2

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Read value of temperature

Request: 0x11 0x03 0x00 0x01 0x00 0x01 0xD7 0x5A


Slave ID 0x11 1




CRC check 0xD75A 2 High half-word first

Response: 0x11 0x03 0x02 0x00 0xF2 0xF8 0x02


Slave ID 0x11 1



Register 1 0x00F2 2 Temperature value

CRC check 0x F802 2

Set ID

We save slave’s address in internal register at address 0x000A.

Request: 0x11 0x06 0x00 0x0A 0x00 0x02 0x2A 0x99


Slave ID 0x11 1

Function code 0x06 1 Write Registers

Starting Address 0x000A 2 High half-word first

New ID 0x0002 2 High half-word first

CRC check 0x2A99 2 High half-word first

Response: 0x02 0x06 0x00 0x0A 0x00 0x02 0x28 0x3A


Slave ID 0x02 1

Function code 0x06 1 Write Registers



CRC check 0x283A 2 High half-word first

Reset ID

Request: 0x00 0x6E 0x00 0x0A 0x00 0x11 0x09 0x DC


Broadcast address 0x00 1

Function code 0x6E 1 Write Registers



CRC check 0x09DC 2 High half-word first

3.5 MODBUS exceptional response

1. ILLEGAL FUNCTION

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Request: 0x 11 0x01 0x00 0x00 0x00 0x02 0xBF 0x5B

Response: 0x11 0x81 0x01 0x54 0xA0

Slave return exception code 0x01 because our product do not function code 0x01.

2. ILLEGAL DATA ADDRESS

Request: 0x 11 0x04 0x00 0x01 0x00 0x02 0x22 0x9B

Response: 0x11 0x84 0x02 0xC3 0x04

Slave return exception code 0x02 because master want to read two registers from starting address.

Because register address 0x0002 is reserved, there is no value.

3. ILLEGAL DATA VALUE

Request: 0x 11 0x06 0x00 0x00 0x00 0x00 0x8B 0x5A

Response: 0x11 0x86 0x03 0x03 0xA4

Slave return exception code 0x03 because master can’t set slave’s ID as 0 which is used as broadcast

address.

4. ASCII code command

USR-HTW also support self-defined command.

READ

Read temperature and humidity once.

Instruction format: READ(ASCII code)

Return data format: 29.8,56.5%(ASCII code)

AUTO

Return current temperature and humidity every 2 seconds.

Instruction format: AUTO(ASCII code)

Return data format: 29.8,56.5%(ASCII code)

STOP

Stop returning current temperature and humidity.

Instruction format: STOP

Contact Information

-----------------------------------------------------------------------------------

Company: Jinan USR IOT Technology Limited

Address: 1-728, Huizhan Guoji Cheng, Gaoxin Qu, Jinan, Shandong, China

Tel: 86-531-55507297 86-531-88826739-803

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Web: http://en.usr.cn

Email: [email protected], [email protected]

-----------------------------------------------------------------------------------

Disclaimer

This document provides information about USR-HTW, this document does not grant any license to

intellectual property rights. Except the responsibility declared in the product sale clause, USR does

not assume any other responsibilities. In addition, USR does not make any warranties for the sale

and use of this product, including the suitability of the product for a particular purpose,

merchantability or fitness for any patent, copyright or other intellectual property infringement, etc.

USR may make changes to specifications and product descriptions without notice.

Update History

V 1.0 11-28-2014. First Version

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Humidity and Temperature Transmitter Specification modbus EN V1.0.pdfThe temperature is below 0 o C...

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