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Advantech Wireless I O Module 4 Channels Wireless Modbus RTU 4-20mA Wireless Signal Transfer

I am pleased with them. It was a good choice for our small application. It is a robust device even it has a cheap price. I will use them in our further applications when we should use remote control. Thank you for your support.

—— Codreanu from Romania

Great news! We successfully performed the installation of the two units and transmitted our 4-20mA signal with both antennae. Even the smaller antenna suffices to transmit the signal without any losses whatsoever. So you can understand that we are very happy :) .

—— Kekarios from Greek

I believe you and your products. Sunny is very responsible. The RF modules are really strong and stable. Engineer's suggestions are useful to me. The most important is module's program can updrade on-line by myself. For some special projects, they can customize according my requirements. Thank you for your support all the time.

—— Singh from India

First of all I'd like to thank you for you're prompt service. The system now works perfectly. I left a positive response on your web site. I hope it attracts more customers for you.

—— Peter from Australia

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Advantech Wireless I O Module 4 Channels Wireless Modbus RTU 4-20mA Wireless Signal Transfer

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Product Details:
Place of Origin: China
Brand Name: Lensen
Model Number: LS-RAO04
Payment & Shipping Terms:
Minimum Order Quantity: 2pcs
Price: Negotiation
Packaging Details: standard carton
Delivery Time: 2-8days
Payment Terms: T/T, Western Union
Detailed Product Description
Power Output: 1W Frequency: 433MHz
Distance: 2km Output: 4 Outputs
Application: Wireless Sensor Signal: 0-5V Or 4-20mA
High Light:

remote i o module


remote io system

LS-RAO04 wireless analog acquisition module


LS-RAO04 Modbus RTU is a 1W I/O module, 4 analog outputs, 1 RS485 (wireless RS485 customizes). Wireless control 2km-3km. Use for sensor and PLC/HMI wireless communication.

  • Transparent I/O System
  • Not need internet, no third party cell, no monthly fees
  • You have full control over your own carrier
  • Real time status feedback from the remote site
  • Fast installation and easy setup


Frequency 433MHz or 450MHz or 470MHz
Power output 1W
Products 4AO
Input type 4-20mA or 0-5V or 0-10V
Output type 4-20mA or 0-5V or 0-10V
Resolution ratio 24 bit
Accuracy ±0.02%
Power supply 9-36V DC usually use 24V DC
Interface RS-485
Channel No. 15ch default, can program via DIP switch
Antenna Sucker antenna with 1.5m cable
Working temperature -35 °C~+75 °C industrial
Working humidity 10%-90% relative humidity, no condensation
Dimension 115×90×40(mm)
Fix way Standard 3.5 inch industrial DIN guild rail


Advantage of wireless solution

- No wires to bury or maintain, no need to drill holes on wall

- Reliable communication in all direction,any terrain, regardless of hills, walls, trees

- Cost saving in installation and maintenance

- Radio/Lora based, no need internet and monthly fee, full ownership of the system

- 4G based, high speed, no distance limit


Lensen Wireless RTU features

- Portable device, DIN-rail mounting for easy installation

- Isolated inputs

- LEDs for power supply, communication, input, output status

- Flexible networking, point to point or point to multipoints

- DIP to change different modes

- Different types of I/O, DI, DO, AI, AO are available

- I/O expandable

- Short delay time

- Easy handing on RS485 network, support Modbus RTU protocol

- Support on-line upgrade. Can configure by customer in setting mode



Modbus RTU communication and corresponding value

Register types:

Register types Read command

Write command

(Control command)

Power off Function
Hold register 0x01

Input --not support


Not keep Can read input value


A. Hold register

1. Analog input value: 0x0008~0x000B

2. Analog output value: 0x0048~0x004B


B: How to read

Hold register: can read 4 analog input or control 4 analog output at one time


Register control way





Function ID items support
No. IC Type PLC ID Modbus ID
AI1 Hold register 40009 8 Read 03 2AI/4AI
AI2 Hold register 40010 9 Read 03
AI3 Hold register 40011 10 Read 03 4AI
AI4 Hold register 40012 11 Read 03
AO1 Hold register 40073 72 Read/write 03/06 2AO/4AO
AO2 Hold register 40074 73 Read/write 03/06
AO3 Hold register 40075 74 Read/write 03/06 4AO
AO4 Hold register 40076 75 Read/write 03/06


About value calculation

Analog input

Our analog module’s max measure range value is : 0X7FFF

1. Directly measure current and voltage

Exact value=value you read/0x7FFF*max range

For example: to read the 1st passage of module’s (with max range of 0-20mA) input value

Register 0x0008(analog input of the 1st passage)

Feedback: 0x3801

Current value: (0x3801/0x7FFF)*20mA=8.7509mA


2. To measure sensor’s value(4-20mA, 0-6 meter level sensor)

If feedback value is less than 6554, level value is 0

If feedback value is bigger than 6554, level value=(value read-6554)/(32767-6554)*measure ranges

For example: feedback value is 0X3801, then corresponding level value is: ((0X3801-6554)/26213)*6 meter=1.7815 meter


Analog output

Analog module’s max measure range is: 0x7FFF

Directly control output current and voltage

Write register value=current or voltage value/measure range*0x7FFF

For example: to control the 1st passage of analog module whose max measure range is 0-20mA

Register 0x0048 (analog output of the 1st passage)

To write register value:(8.75/20mA)*0X7FFF =14336=0x3800


Advantech Wireless I O Module 4 Channels Wireless Modbus RTU 4-20mA Wireless Signal Transfer 0


Advantech Wireless I O Module 4 Channels Wireless Modbus RTU 4-20mA Wireless Signal Transfer 1

Contact Details
Shenzhen Qianhai Lensen Technology Co., Ltd

Contact Person: Sunny

Tel: +8613826574847

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