TSH300v3
Modbus RTU humidity and temperature sensor Version 1.14/November 2023
USER MANUAL
Short description
TSH300v3 (successor of TSH300) is a humidity and temperature sensor with an RS-485 interface.
It supports the Modbus RTU protocol. The device doesn’t need an external power supply, it is powered through the interface.
The humidity and temperature sensor integrate basic elements plus signals processing and provides a fully calibrated digital output. A unique capacitive element is used for measuring relative humidity while the temperature is measured by a band gap sensor. Both sensors are seamlessly coupled to a 12-bit analog to digital converter. This results in superior signal quality. The sensor is delivered with one-meter standard patch cable with RJ45 connectors.
Features
- RS-485 interface carrying up to 32 nods;
- LED indicator for status of communication;
- Changeable bitrate and another communication parameters;
- Firmware update via the interface.
Applications
- Server room and data centers humidity and temperature logging
- Environmental quality monitoring and assessment
- Humidity and temperature monitoring in building management systems
- Humidity and temperature logging for mobile operator facilities, vineyards, greenhouses, etc.
Specifications
- Physical characteristics
Dimensions: 85 x 35.1 x 23.5mm
Weight: 40g - Environmental limits
Operating temperature range: -20 to 60°C
Operating relative humidity range: 10 to 90% (non-condensing)
Recommended operating range is 20% to 80% RH (non-condensing) over –10 °C to 60 °C
Prolonged operation beyond these ranges may result in a shift of sensor reading, with slow recovery time Long term drift typical: ±0.25%RH/year, ±0.05°C/year Storage temperature range: -20 to 60°C Higher drift might occur due to contaminant environments with vaporized solvents, adhesives, packaging materials, etc.
Storage relative humidity range: 10 to 90% (non-condensing) Ingress protection: IP20 - Power requirements
Operating voltage range (including -15/+20% according to IEC 62368-1): 4.5 to 26VDC Current consumption: 5mA@5VDC - Humidity measurements
Accuracy (min): ±3.0%RH (in 20 to 80 %RH range) Accuracy (max): ±5.0%RH (in 10 to 90 %RH range) Resolution: 0.1%RH - Temperature measurements Accuracy (min): ±0.4°C (in -10 to +60°C range) Accuracy (max): ±0.6°C (in -20 to +60°C range) Resolution: 0.1°C
- Interface
Response time ≤ 50ms Master response time-out ≥ Response time + Answer time The answer time depends on the number of bits and the baud rate - Warranty
Warranty period: 3 years
Pinout
 |
Pin | Description | UTP wires color |
| 1 | not connected (most right) | Orange/White Tracer | |
| 2 | not connected | Orange | |
| 3 | not connected | Green/White Tracer | |
| 4 | RS485- (B-) | Blue | |
| 5 | RS485+ (A+) | Blue/White Tracer | |
| 6 | not connected | Green | |
| 7 | +VDD | Brown/White Tracer | |
| 8 | GND | Brown |
Installation
A daisy-chained (linear) topology for multiple sensors should be used. UTP/FTP cables with RJ-45 connectors are used for interconnection. The popular ANSI/TIA/EIA T568B wiring is used. Standard patch LAN cables are recommended.
Attention:
The last sensor in the chain should have a 120 ohm terminator installed on the free RJ-45 socket.
The terminator is delivered with the module.
Installation tips
The location and the mounting position of the sensor have a direct effect on the accuracy of the measurement. The tips below will ensure good measuring results:
- Sensor shall be installed about 1.2-1.4 m above the floor;
- To avoid solar radiation, the sensor should not be installed next to windows or directly in the sunlight;
- Sensors shall be installed in a place with sufficient air circulation.
- Sensors shall be wall mounted with vent holes up/down to ensure air circulation.
Status indicator
The status of the device is shown by single LED, located on the front panel:
- If the LED blinks on period of 1 second, sensor works properly;
- If the LED blinks on period of 3 seconds, there isn‘t communication with the controller;
- If LED doesn‘t blink, there isn‘t a power supply.
Factory default settings
Disconnect the sensor from the bus (switch off the power supply).
Press and hold the “config” button. Don’t release the button, connecting the sensor to the bus (switch on the power supply).
The “status” LED will be ON for 3 seconds and after this will flash for 7 seconds. After the 10 second the LED will be ON.
Release the button. The sensor will restart with factory default settings.
Firmware update
The firmware of the sensor can be updated with a Teracom controller which supports MODBUS RTU or MBRTU-Update software. For more details ask your dealer. th
Modbus address table
|
Register name |
R/W | FC | PDU Address (Decimal) |
Logical Address (Decimal) |
Offset (Decimal) |
Data size | Default |
Valid values |
| RS-485 address | R/W | 03/06 | 10 | 40011 | 40001 | 16-bit uns. integer | 1 | 1-247 |
| Baud rate* | R/W | 03/06 | 11 | 40012 | 40001 | 16-bit uns. integer | 19200 | 2400, 4800, 9600, 19200, 38400, 57600 |
| Parity, data, stop bits * | R/W | 03/06 | 12 | 40013 | 40001 | 16-bit uns. integer | 1 | 1=E81, 2=081, 3=N81 |
| Data order | R/W | 03/06 | 13 | 40014 | 40001 | 16-bit uns. integer | 1 | 1=MSWF (MSW, LSW) 2=1.SWF (LSW, MSW) |
| Device code | R | 03 | 14 | 40015 | 40001 | 16-bit uns. integer | Ox00CD | |
| FW version | R | 03 | 15 | 40016 | 40001 | 16-bit uns. integer | ||
| Vendor URL | R | 03 | 18 | 40019 | 40001 | 64 bytes UTF-8 | teracomsystems.com | |
| Float test value (MSWF) | R | 03 | 82 | 40083 | 40001 | 32-bit float | -9.9(0xC11E6666) | |
| Float test value (LSWF) | R | 03 | 84 | 40085 | 40001 | 32-bit float | -9.9(0xC11E6666) | |
| Signed integer test value | R | 03 | 86 | 40087 | 40001 | 16-bit sig. integer | -999(0xFC19) | |
| Signed integer test value (MSWF) | R | 03 | 87 | 40088 | 40001 | 32-bit sig. integer | -99999(OxFFFE7961) | |
| Signed integer test value (LSWF) | R | 03 | 89 | 40090 | 40001 | 32-bit sig. integer | -99999(0OFFE7961) | |
| Unsigned integer test value | R | 03 | 91 | 40092 | 40001 | 16-bit uns. integer | 999(0x03E7) | |
| Unsigned integer test value (MSWF) | R | 03 | 92 | 40093 | 40001 | 32-bit uns. integer | 99999(0x0001869F) | |
| Unsigned integer test value (LSWF) | II | 03 | 94 | 40095 | 40001 | 32-bit uns. integer | 99999(0x0001869F) | |
| Temperature ‘C | R | 03 | 100 | 40101 | 40001 | 32-bit float | ||
| Humidity %RH | R | 03 | 102 | 40103 | 40001 | 32-bit float | ||
| Dew point ‘C | R | 03 | 104 | 40105 | 40001 | 32-bit float | ||
| Temperature ‘F | R | 03 | 200 | 40201 | 40001 | 32-bit float | ||
| Humidity %RH | R | 03 | 202 | 40203 | 40001 | 32-bit float | ||
| Dew point °F | R | 03 | 204 | 40205 | 40001 | 32-bit float | ||
| Temperature ‘C x 100 | R | 03 | 400 | 40401 | 40001 | 16-bit sig. integer | ||
| Humidity %RH x 100 | R | 03 | 401 | 40402 | 40001 | 16-bit uns. integer | ||
| Dew point ‘C x 100 | R | 03 | 402 | 40403 | 40001 | 16-bit sig. integer | ||
| Temperature ‘F x 100 | R | 03 | 500 | 40501 | 40001 | 16-bit sig. integer | ||
| Humidity %RH x 100 | R | 03 | 501 | 40502 | 40001 | 16-bit uns. integer | ||
| Dew point °F x 100 | II | 03 | 502 | 40503 | 40001 | 16-bit sig. integer | ||
| Temperature multiplier” | R/W | 03/16 | 2101 | 42102 | 40001 | 32-bit float | 1.000 | |
| Temperature offset °C “ | R/W | 03/16 | 2103 | 42104 | 40001 | 32-bit float | 0.000 | |
| Temperature offset ‘F “ | R | 03 | 2105 | 42106 | 40001 | 32-bit float | 0.000 | |
| Humidity multiplier ‘• | R/W | 03/16 | 2111 | 42112 | 40001 | 32-bit float | 1.000 | |
| Humidity offset” | R/W | 03/16 | 2113 | 42114 | 40001 | 32-bit float | 0.000 |
The shown logic decimal addresses are calculated with offsets 40001 (holding registers).
MSWF – Most significant word first – (bits 31 … 16), (bits 15 … 0); LSWF – Least significant word first – (bits 15 … 0), (bits 31 … 16);
PDU address – Actual address bytes used in a Modbus Protocol Data unit
When a floating-point value is not available, the returned value is “NaN” (e.g. in case of measurement error).
When a 16-bit signed integer value is not available, the returned value is “-32768” (e.g. in case of measurement error).
* The settings will take effect after restarting the device by power-off, power-on.
** Measured sensor values can be corrected by employing a multiplier and an offset.
The corrections are the results of the following calculations:
Corrected Temperature (°C) = Measured Temperature (°C) × Temperature Multiplier + Temperature Offset (°C)
Corrected Humidity = Measured Humidity × Humidity Multiplier + Humidity Offset
Using a multiplier and an offset allows precise adjustments to the sensor readings, ensuring accurate temperature and humidity values.
It’s crucial to emphasize that the multiplier and offset are applicable exclusively in degrees Celsius. After obtaining the corrected temperature in Celsius, it can then be converted to Fahrenheit.
Documents / Resources
 |
TERACOM TSH300v3 Humidity And Temperature Sensor [pdf] User Manual TSH300v3 Humidity And Temperature Sensor, TSH300v3, Humidity And Temperature Sensor, Temperature Sensor, Sensor |