Modbus protocol human presence counting sensor product manual

I. Product Overview

Core Functions: Real time detection of human presence and counting of the number of people (up to 10 people) through local AI video analysis, without the need for internet connection, ensuring privacy and security.
Technical Features:

• Offline Processing: Embedded AI Chip Local Computing, No Image Storage/Transmission
• Dual Protocol Compatibility: Supports Standard Modbus RTU and Custom Communication Protocol
• Multi Dimensional Output: Human Status Signal, Real time Person Count, Programmable Voice Broadcast, Dry Contact Control (Optional)

II. Technical Specifications

3, Detailed explanation of core functions

1. Human body detection

• Based on computer vision algorithms, recognize human body contours and output the presence status (0=unmanned/1=manned) and accurate number of people.
• Accuracy limitationHead obstruction may lead to missed detections; Multiple people need to keep their heads and shoulders non overlapping.

1. Voice broadcasting system Trigger logic Voice bank typical scenarioSomeone detected 9 preset welcome prompts, security warnings, area reminders, etc. No one detected 5 preset departure reminders, safety confirmations, job duty, etcBroadcast mode4 options for single/loop broadcasting (supporting combination triggering of states)
2. Visual indication

• Tri color LED status light:
  • Red: No human body detected
  • Green: Human body detected
  • Blue: Configuration mode activated

1. Control signal output

• Dry contact output (customized version):
  • Maintain mode: Someone closes/No one disconnects
  • Pulse mode: Width adjustable (0.1-25.5 seconds)
• Digital signal outputReal time upload of JSON format data packets via RS485

4, Installation configuration refers to

electrical connection

电源+ ──► 12-24V DC  
电源- ──► GND  
信号+ ──► RS485 A线  
信号- ──► RS485 B线  

Safety Specifications:

• The power must be cut off before operation!
• Use a non-contact voltage detector to verify power failure
• It is strictly prohibited to operate in humid environments

Wireless configuration process

1. Activation configuration mode: Trigger the remote control setting button 5 times continuously within 5 seconds (all three lights are on)
2. Key parameter settings:

• Detection delay: 1-7200 seconds (affecting unmanned state determination)
• Device address: 1-254 (unique identifier when multiple devices are networked)
• Voice strategy: Independently set manned/unmanned broadcast content

1. Save mechanism:

• Success: Green light flashes once
• Failure: Red light flashes once

Shortcut command:

• Device inspection: single press the query key to obtain the address
• Emergency restart: press the settings key 5 times within 5 seconds
• Factory recovery: press the settings key 10 times within 10 seconds

V. Communication protocol architecture

Modbus register mapping table

Communication Instance

1. Read Human Body Status(Device Address 0x01)

   TX: 01 03 00 00 00 01 84 0A  
   RX: 01 03 02 00 01 79 84  // 00 01表示检测到人体

2. Set 10 Second Delay

   TX: 01 06 00 02 00 0A 28 0F  
   RX: 01 06 00 02 00 0A 28 0F  // 回声验证

VI. Typical Application Scenarios

• Intelligent Lighting ControlDynamically adjust the light intensity based on the number of people
• Security monitoring system: Dangerous Area Voice Warning (such as "No Entry" Broadcast)
• Energy Management System: Automatic shutdown of air conditioning/equipment power in unmanned areas
• Space utilization analysis: Statistics of pedestrian flow in commercial places

7. Technical support

• Physical packaging:
• Single box content: Sensor x 1, manual, warranty card
• Transportation specifications: 50 pieces/box (net weight 10kg, size 45 × 45 × 25cm)
• Quality assurance: 12-month limited warranty (non-human damage)