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Power-Up
Power the sensor connecting power supply the VCC and GND terminals.
After power-up, the sensor briefly displays the configured baud rate and RS-485
address, and then switches displaying the measured temperature and humidity
values.HW-group.
Each UNI3-compatible sensor has:
- standard Modbus RTU address (primary address)
- factory-assigned secondary address (serial number)
During automatic detection, Perseus communicates with sensors using the secondary
address via the HWg UNI3 protocol extension.
The UNI3 extension allows Perseus to:
- detect compatible RTU sensors the RS-485 bus
- identify available sensor variables
- automatically add sensors the system
- automatically configure detected variables
- remotely update sensor firmware.
Automatic Detection RTU Sensors Perseus
HWg Perseus devices support automatic detection group Modbus RTU sensors
equipped with the UNI3 extension.
For UNI3 communication:
- Modbus/RTU address 240 reserved the RS-485 bus
- supported baud rates are 4800, 9600, and 19200 Bd
- standard Modbus RTU device with address 240 may present the bus
UNI3-compatible sensors can also operate standard Modbus RTU devices without
automatic detection.
