Flush-mounting microprocessor sensors for ambient temperature and humidity measurement baud rate 19200

Use cases

• Monitor room temperature and humidity on a live cloud dashboard for residential or commercial buildings.
• Set up alerts when humidity exceeds a threshold, helping prevent mold or condensation issues.
• Remotely adjust calibration offsets for temperature and humidity without an on-site visit.
• Log historical temperature and humidity data per room to verify HVAC system performance over time.
• Compare climate conditions across multiple zones by deploying several MB-TH-SXX sensors on one RS-485 bus.

Installation

1. 1Wire the MB-TH-SXX sensor to the RS-485 port (A and B terminals) of your ModbusCloud gateway (MCG or MLP series), observing correct polarity.
2. 2Set a unique Modbus slave address on each MB-TH-SXX sensor, choosing a value between 1 and 255 that does not conflict with other devices on the bus.
3. 3Configure the gateway RS-485 port to match the sensor communication parameters: 19200 baud, no parity, 8 data bits, 1 stop bit.
4. 4Import the SETECNA EPC MB-TH-SXX template from the ModbusCloud library and assign it to the correct slave address in your project.
5. 5Verify that actual temperature and actual relative humidity readings appear on the ModbusCloud dashboard, and check that values are plausible for the current room conditions.
6. 6If readings require fine-tuning, use the temperature calibration offset and humidity calibration offset controls in the template to apply corrections.

Things to watch for

01

No data appears after connecting the sensor. What should I check?

Verify that the RS-485 wiring polarity (A and B) is correct and that the gateway port is set to 19200 baud, no parity, 8 data bits, 1 stop bit. Also confirm the slave address in the template matches the address configured on the sensor.

02

Can I mix MB-TH-SXX sensors with other Modbus RTU devices on the same bus?

Yes, as long as all devices share the same baud rate (19200) and communication settings (N, 8, 1), and each device has a unique slave address.

03

How do the calibration offset registers work?

Writing a value to the temperature or humidity calibration offset register shifts the reported reading by that amount. This allows you to compensate for minor measurement deviations without physical access to the sensor.

04

What is the maximum number of sensors I can connect on one RS-485 bus?

The slave address range is 1 to 255. The practical limit depends on the RS-485 driver capability of your gateway and total cable length. Using a bus termination resistor at both ends is recommended for longer runs.

Registers (4)

4 read / 2 write

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