TST300V3/V4
Modbus RTU temperature sensor
Version 1.12 / June 2023
USER MANUAL
Short description
TST300v3/v4 (successors of TST300) is a high accuracy temperature sensor with an RS-485 interface. The device doesn’t need external power supply, it is powered through the interface.
The temperature sensor integrates a band-gap temperature sensor element plus signals processing and provides a fully calibrated digital output. The temperature sensors are factorycalibrated.
The calibration data is stored in the non-volatile memory. This ensures fully interchangeable of the sensors without any extra efforts.
The sensor is delivered with one meter standard patch cable with RJ45 connectors. A 19” rack mount kit can be ordered separately.
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 temperature monitoring and logging.
- High precision temperature monitoring and logging for food and drug storages.
- Environmental quality monitoring and assessment.
- Temperature monitoring in building management systems.
Specifications
The device has following 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: 5 to 85% (non-condensing)
Storage temperature range: -20 to 60°C
Storage relative humidity range: 5 to 85% (non-condensing)
Ingress protection: IP20 - Power requirements
Input Voltage: 4.5 to 26VDC
Input Current: 7mA@5VDC - Temperature measurements
Accuracy (min): ±0.13°C (in +20 to +60°C range)
Accuracy (max): ±0.25°C (in -20 to +60°C range)
Resolution: 0.1°C - Interface
Number of bus transceivers: up to 32
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 1 not connected (most right) 2 not connected 3 not connected 4 RS485- 5 RS485+ 6 not connected 7 +VDD 8 GND |
Corresponding UTP wires color Orange/White Tracer Orange Green/White Tracer Blue Blue/White Tracer Green Brown/White Tracer 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 sensors has a direct effect on the accuracy of monitoring the room humidity and temperature. The tips below will ensure good measuring results:
- Sensor shall be installed about 1.2-1.4 m above the floor;
- Sensor should not be installed next to windows to avoid solar radiation;
- 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 power supply.
Factory default settings
Disconnect the sensor from the bus (switch off the power supply).
Press and hold “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-the 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 Teracom controller which supports MODBUS RTU or MBRTU-Update software. For more details ask your dealer.
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=LSWF (LSW, MSW) |
| Device code TST300v3 | R | 3 | 14 | 40015 | 40001 | 16-bit uns. integer | OxOOCB | |
| Device code TST300v4 | R | 3 | 14 | 40015 | 40001 | 16-bit uns. integer | Ox0100 | |
| FW version | R | 3 | 15 | 40016 | 40001 | 16-bit uns. integer | ||
| Vendor URL | R | 3 | 18 | 40019 | 40001 | 64 bytes UTF-8 | teracomsystems.com | |
| Float test value (MSWF) | R | 3 | 82 | 40083 | 40001 | 32-bit float | -9.9(0xC11E6666) | |
| Float test value (LSWF) | R | 3 | 84 | 40085 | 40001 | 32-bit float | -9.9(0xC11E6666) | |
| Signed integer test value | R | 3 | 86 | 40087 | 40001 | 16-bit sig. integer | -999(0xFC19) | |
| Signed integer test value (MSWF) | R | 3 | 87 | 40088 | 40001 | 32-bit sig. integer | -99999(OxFFFE7961) | |
| Signed integer test value (LSWF) | R | 3 | 89 | 40090 | 40001 | 32-bit sig. integer | -99999(OxFFFE7961) | |
| Unsigned integer test value | R | 3 | 91 | 40092 | 40001 | 16-bit uns. integer | 999(0x03E7) | |
| Unsigned integer test value (MSWF) | R | 3 | 92 | 40093 | 40001 | 32-bit uns. integer | 99999(0x0001869F) | |
| Unsigned integer test value (LSWF) | R | 3 | 94 | 40095 | 40001 | 32-bit uns. integer | 99999(0x0001869F) | |
| Temperature °C (MSWF/LSWF) | R | 3 | 100 | 40101 | 40001 | 32-bit Float | ||
| Temperature °F (MSWF/LSWF) | R | _ 03 | _ 200 | 40201 | 40001 | 32-bit Float |
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
A “NaN” value is returned for unavailable floating-point values (e.g. in case of measurement error)
* The settings will take effect after restart of the sensor by power on reset.
Recycling
Recycle all applicable material.
Do not dispose of with regular household refuse.
TST300v3/v4_R1.12 – June 2023
www.teracomsystems.com
Documents / Resources
 |
TERACOM TST300v3 Modbus RTU Temperature Sensor [pdf] User Manual TST300v3 Modbus RTU Temperature Sensor, TST300v3, Modbus RTU Temperature Sensor, RTU Temperature Sensor, Temperature Sensor, Sensor |
