This document is applied for the following products

STHC-ISG02DB HW Ver. 3.3 FW Ver. 3.4
WS433-CL-04 HW Ver. 2.3 FW Ver. 1.9.3
Item Code

STHC-ISG02DB-WS433-CL-04 iConnector 3G Dual Band*, internal GSM antenna, integrated wireless co-ordinator with 0 dbi external antenna, M12 male connector, RS485 ModbusRTU

1. Functions Change Log

  HW Ver. FW Ver. Release Date Functions Change
Gateway 3.3


Co-odinator 2.3 1.9.3 NOV-2019  

2. Introduction

STHC is a Smart IoT Gateway, aka iConnector, a main component in any IoT application. iConnector has a role to connect the real World's things like sensors, meters, , server system for data logging, data analytics, monitoring & controls... This iConnector is build-in a wireless co-ordinator in a wireless sensor network, a high-performance type to facilitate remote configuration and diagnostics, as well as remote monitoring and control via any IIoT platform. It is able to configure the parameters for all end nodes in the network. By the Sub-Ghz technology from Texas Instruments, it is easy to establish multiple networks in same area without interference or channel conflict. One co-ordinator can handle maximum of 40 end nodes in its network. LOS transmission distance up to 6000m. The installation and configuration is very simple. Setting up a wireless sensor network has never been this easy.


3. Specification

Host Communication Cellular type Dual band (2100/900)/3G, internal GSM antenna, integrated wireless co-ordinator
Fieldbus communcation ModbusRTU x 01 port
Data speed Up to 50kbps
Tranmission distance LOS 6000m @ 50 kpbs (antenna height is 4m minimum)
Antenna Standard external antenna 0 dbi, option 3dbi, 6dbi, 9dbi
Power supply 7..48VDC, avg 200mA, peak 1.5A
On-board memory & sensors 2MB Flash, PCB temperature sensor
Electrical connector M12-female, 4-pin A-coding
Buzzer Internal buzzer
Back-up battery Lithium Super Capacitor
RF frequency band Free license ISM 433.92Mhz (for others 868, 915, 920Mhz, refer related datasheets)
Ready to comply ETSI EN 300 220, EN 303 204 (Europe) FCC CFR47 Part15 (US), ARIB STD-T108 (Japan)**
Vietnam Type Approval Certification QCVN 73:2013/BTTTT, QCVN 96:2015/BTTTT (DAVITEQ B00122019)
Security Standard AES-128
Operating temperature -40oC..+85oC
SIM slot 01 x micro-SIM
Housing Aluminum + Polycarbonate, IP67
Included accessories Mounting bracket for wall mount
Product dimension H106 x W73x D42 mm (excluded antenna)
Net weight 190 grams
Box dimension W160 x D150 x H100 mm
Gross weight < 300g

4. Product Pictures

STHC-ISG02DB-WS433-CL-04-H1.png STHC-ISG02DB-WS433-CL-04-H2.png
STHC-ISG02DB-WS433-CL-04-H3.png STHC-ISG02DB-WS433-CL-04-H4.png
STHC-ISG02DB-WS433-CL-04-H5.png STHC-ISG02DB-WS433-CL-04-H6.png
STHC-ISG02DB-WS433-CL-04-H7.png STHC-ISG02DB-WS433-CL-04-H8.png

5. Operation Principle

After the power supply will have 5 minutes to add nodes (value enb_auto_add_sensors = 1 in 5 minutes then = 0), push button function and hall sensor are only available in the first 5 minutes

Push Button or Hall sensor for the first 5 minutes when power is available:

  • Press and hold the push button or bring the magnet near the Hall sensor for 2s => see the LED blink once or the buzzer will ring 1 Beep => release the push button or take the magnet to set Data rate RF 50kbps
  • Press and hold the push button or bring the magnet near the Hall sensor for 5s => see the LED blink twice or the buzzer beep 2 Beep => release the push button or take the magnet to set Data rate RF 625bps
  • Press and hold the push button or bring the magnet near the Hall sensor for 10s => see the LED blinking 3 times or the buzzer buzzes 3 Beep => release the push button or take the magnet to perform the User factory reset (User factory reset = reset frequency number, RF transmit power, data rate, Node ID of 40 WS, Modbus operating parameters, compare time for data status)
  • If it takes more than 30 seconds, the button will be deactivated

5.1 Add Sensor Node

 Add Sensor Node ID automatically



  • Step 1: After supplying power the iConnector via M12 connector, the Node ID must be registered within the first 5 minutes, up to 40 WS.

    Step 2: Bring the wireless sensor closer to the iConnector's antenna then take off the wireless sensor battery, wait for 5s then insert the battery again. If:

    • Buzzer plays 1 peep sound, LED blink 1 time, that means registering Node ID on iConnector successfully.
    • Buzzer plays 2 peep sounds, LED blink 2 times, that this Node ID is already registered.

If you do not hear the "Peep" sound, please disconnect the power the iConnector, wait a few minute and try again.

Node id added in this way will be written to the smallest node_id_n address which is = 0.

Set Rssi_threshold (see RF MODE CONFIG (in the Modbus Memmap of WS433-CL), default -25): The case if Co-ordinator is on high position and need to add node sensor. We set the sensor as close as possible and set the Rssi_threshold to -80, -90 or -100 to increase the sensitivity to allow iConnector can add sensors at a longer distance. After that, perform 2 steps of adding sensors and then reset Rssi_threshold = -25.

Enb_auto_add_sensors configuration (see RF MODE CONFIG (in the Modbus Memmap of WS433-CL)): In case you do not want to turn off the power iConnector, you can set Enb_auto_add_sensors = 1, this way we have 5 minutes to add nodes (add up to 40 nodes) . After 5 minutes Enb_auto_add_sensors will automatically = 0.


  • Protocol: Modbus RTU
  • Address: 1 - 247
  • Baud rate: 9600 , 19200
  • Parity: none, even, odd
  • Stop bits: 1

Memmap resgisters

You can download Modbus Memmap of WS433-CL-FW_V2.0 with the following link:

5.2 Check after configuring the iConnector

First, you need to prepare


Step 1: Open Modbus tool on PC

  • You can download Daviteq Modbus Configuration Tool Version 1.4 with the following link:

  • Unzip and run file application "Daviteq Modbus Configuration Tool Version"


  • Choose COM Port (the Port which is USB cable plugged in)
  • Set the BaudRate: 9600, Parity: none


  • Click “ Connect “ untill the Status displays “disconnected” to “connected“. It means the WS433-CL-04 is being connected with computer;
  • Next, we need to import the configuration file for WS433-CL-04 by importing the csv file: Go to MENU: FILE / Import New / => select the file with name Template_WR433_V1.6.csv. This file is attached in the zip file.


Step 2: Check information of sensor after adding S/N of each sensor

5.3 SIM configuration

iConnector 3G uses micro-SIM and needs to be configured to use the data network

  1. Open iConnector cover and install the SIM cardSTHC-ISG02DB-WS433-CL-04-H16.png
  2. Based on the information of the mobile carrier that provides the SIM card, we configure data such as APN, username, password on the 2G/3G tabSTHC-B-H18.png

How to use iConnector config tool (Click Here)

5.4 Reset sensor and iConnector sensor node

Step 1: Connect Antenna, RS485 - configuration cable and power supply co-ordinator

STHC-ISG02DB-WS433-CL-04-H10.png STHC-ISG02DB-WS433-CL-04-H11.png
STHC-ISG02DB-WS433-CL-04-H12.png STHC-ISG02DB-WS433-CL-04-H13.png

Step 2: Put the magnet closer to the icon on iConnector until you hear "peep" 3 times to reset (2 times for 625 kps option)

Step 3: Take off the sensor cover and press the button until you see LED flashes 3 times to reset (2 times for 625 kps option)

6. Installation

6.1 Mounting bracket installation

The mounting bracket is made from hard metallic material. Following to these steps as the below picture


6.2 Installation location

To maximize the distance of transmission, the ideal condition is Line-of-sight (LOS) between the two modules. In real life, there is no LOS condition. However, the two modules still communicate each other, but the distance will be reduced significantly.

Therefore, to maximize the transmission distance, please pay attention to the following conditions:

  • DO NOT install the wireless module inside a complete metallic box or housing. The signal can not pass through metallic wall;
  • This wireless module would be installed a semi-metallic box, because the RF signal can pass through the non-metal wall/are;
  • The best case is to install the wireless module inside or Non-metallic box;

Some non-metallic materials: plastic, glass, wood, leather, concrete, cement…

6.3 IO Wiring & Sensor installation

STHC-ISG02DB-WS433-CL-04-H15.png STHC-ISG02DB-WS433-CL-04-H2.png
STHC-ISG02DB-WS433-CL-04-H3.png STHC-ISG02DB-WS433-CL-04-H4.png

7. Troubleshooting

No. Phenomena Reason Solutions
1 Cannot read modbus
  • No power supply, the power cord is incorrectly connected
  • Modbus connection pin A, B is loose or wrong
  • Configuration slave address, baudrate, parity is not correct
  • Reading the wrong command, wrong address register
  • Check the power connection
  • Check the connection modbus A, B
  • Check the configuration of slave address, baudrate, parity
  • iConnector only supports modbus 3, 4, and 16. Check if the value of modbus status returned by 2 or 3 is an incorrect address reading.
2 Failed to add auto sensor
  • When the first 5 minutes are up, the sensor cannot be added
  • Node needs to be added further away from WS433-CL
  • The iConnector and the node are configured to run at 2 different RF frequencies, or different data rates
  • Unplug, wait 10 seconds, plug in again to enable automatic add or write to modbus Enb_auto_add_sensors = 1
  • Bringing nodes and iConnector together or temporarily setting the smaller Rssi_threshold can add sensors farther (then return the old values)
  • Check the RF frequency, data rate of iConnector and the node
3 Read modbus normal health values but read the data of the node, all are 0
  • The modbus 4 command only supports FW 1.9, old FWs can't read command 4
  • Check the FW of WS433-CL in iConnector if it is older than 1.9 then use command 3 to read data and other registers
4 The node's data has no data of prm1 and prm2
  • The sensor attached to the node is loose
  • For the WS433-M12F node, if the sensor is attached after the battery is attached to the node, the sensor type may be different so the data cannot be read.
  • Attach the sensor to the node firmly
  • Attach the sensor to the WS433-M12F node first. Then remove the node pin, wait for 10 seconds, re-attach to the node to re-identify the sensor
5 Status led of iConnector doesn’t light
  • No power supply
  • Check if the power cable is disconnected
  • Check if the connector of iConnector is loose or disconnected
6 Mobus led of iConnector doesn’t light
  • No RS485 connection
  • Check if the signal cable is loose or disconnected
7 Network led of iConnector doesn’t light
  • No network connection
  • Check if the power cable is disconnected
  • Check if the connector of iConnector is loose or disconnected

8. Support contacts



Daviteq Technologies Inc
No.11 Street 2G, Nam Hung Vuong Res., An Lac Ward, Binh Tan Dist., Ho Chi Minh City, Vietnam.
Tel: +84-28-6268.2523/4 (ext.122)

Email: |


Distributor in Australia and New Zealand


Templogger Pty Ltd

Tel: 1800 LOGGER