35mm Cut-Out PIR Ceiling Mount Corridor Occupancy Sensor with RS-485 Protocol
Compact 35mm cut-out PIR ceiling mount occupancy sensor featuring RS-485 protocol communication, designed specifically for corridor and toilet motion detection applications.
Key Features
- Advanced PIR motion detection technology
- Super mini case with planar Fresnel lens
- RS485 protocol output for system integration
- Ambient light detection capability
- Configurable daylight threshold and reporting modes
- Maximum detection range: 8-10 meters diameter
- Ideal for hallway and restroom applications
- Remote configuration of detection area, hold time, and device ID
- Concealed, recessed installation design
- Ultra-small size for seamless ceiling integration
Technical Specifications
| Input/Output Parameters |
| Input Voltage |
12-24V DC |
| Rated Voltage |
12/24V DC |
| Working Current |
20mA maximum |
| Power Consumption |
≤0.5W @12/24V DC |
| Output Signal |
RS485 |
| Sensor Parameters |
| Function |
PIR motion detection + daylight sensor |
| Detection Area |
MH18 remote/RS485 setting: 100%/75%/50%/25% |
| Hold Time |
MH18 remote/RS485 setting: 2s/30s/1min/3min/5min/10min/30min |
| Daylight Sensor Threshold |
MH18 remote/RS485 setting: 5lux/15lux/30lux/50lux/100lux/150lux/Disable |
| Radius Detection Range |
Tangential moving at 3m height: 4-5m @25℃ (radial moving detection range shorter) |
| Remote Control |
Available |
| Mounting Height |
2.5-4m (typical: 3m) |
| Application Environment |
| Drill Hole |
Φ35mm |
| Working Temperature |
-25℃ to +50℃ (detection range varies with temperature) |
| Storage Temperature |
-40℃ to +80℃ |
| Warranty |
3 years (for product quality issues in indoor applications) |
| Wire Standard |
Wire diameter: 0.2-2.5mm, Stripping length: 7-8mm |
| Certification Standards |
| Certificate |
CE Compliant |
| Environmental Requirements |
RoHS Compliant |
| IP Rating |
IP20 |
Product Dimensions
Wiring Diagram
Detection Radiation Pattern
Detection Signal Information
The sensor detects human moving signals within the detection area, specifically optimized for significant human movement such as walking.
Remote Control (MH18)
RS485 Protocol Specifications
| Baud Rate |
9600 |
| Data Bit |
8 |
| Stop Bit |
1 |
| Communication Data Type |
HEX TX/RX |
| Data Command Interval |
>210ms |
Protocol Command Structure
| DATA0 |
DATA1 |
DATA2 |
DATA3 |
DATA4 |
DATA5/DATA6/DATA7 |
DATA8 |
| Frame Header |
ID High Bit |
ID Low Bit |
Data Length |
Function |
Value |
Check Code |
Protocol Commands Reference
| Command |
Function |
Data Range |
R/W |
Default Value |
| 0x00 |
Read Command Value |
- |
w |
- |
| 0x03 |
Presence/Absence Report |
1-2 |
w/r |
01 |
| 0x05 |
Detection Area Setting |
0-100 |
w/r |
100% |
| 0x07 |
Blocking Time |
0-FFFFFF |
w |
0 |
| 0x08 |
Indicator Activation |
0-1 |
w/r |
01 |
| 0x09 |
Daylight Value Report |
0-1200lux |
r |
- |
| 0x0A |
Daylight Difference Value Setting |
10-100 |
w/r |
10Lux |
| 0x0D |
Hold Time Setting |
3-7200 |
w/r |
30s |
| 0x17 |
Firmware Version |
0.0.0-100.0.0 |
r |
Current Version |
| 0x18 |
Setting Device ID |
0x0000-0xFFFF |
w/r |
0xFFFF |
| 0x20 |
Setting Daylight Compensation |
0x01-0x64 |
w/r |
0x0a |
| 0x21 |
Edit Device ID |
0-1 |
w |
0x00 |
| 0x22 |
Report or Reading Mode |
0-1 |
w/r |
01 |
| 0x23 |
Status Flip |
1 |
w |
1 |
| 0x25 |
Daylight Threshold Function |
0-1200lux,65535 |
w/r |
65535 |
| 0x26 |
Sensor Function Activation |
0-1 |
w/r |
0 |
| 0x30 |
Recover Factory Setting |
1 |
w |
- |
Installation Guidelines
- Installation must be performed by a qualified electrician with power disconnected
- Maximum 4m height for indoor use only, away from temperature-sensitive areas
- Ensure no large objects obstruct the detection area (sensor cannot detect through objects)
- Avoid placement near strong-reflecting objects, wifi routers, or microwave ovens
- Detection range optimized for 25℃ environment - performance varies with temperature
- Detection optimized for tangential movement - radial movement detection is shorter
Product Disclaimer
Due to product technology complexity and application environment differences, this specification serves as reference only. We reserve the right to modify product specifications without notification and make no legal commitments or guarantees. Users are encouraged to supplement or modify specification contents based on their product experience.
For detailed technical specifications and protocol documentation, please consult the manufacturer directly.
