TST300v3 Precision Temperature Sensor User Manual

: August 23, 2024
: TST

TST300v3 Precision Temperature Sensor 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

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 Higher drift might occur due to contaminant environments with vaporized solvents, adhesives, packaging materials, etc.
Storage temperature range: -20 to 60°C 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: 7mA@5VDC
Temperature measurements Accuracy (min): ±0.13°C (in -10 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)	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 10th 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.

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=O81, 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| R| 03| 14| 40015| 40001| 16-bit uns. integer| | 0x00CB
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(0xFFFE7961)
Signed integer test value(LSWF)| R| 03| 89| 40090| 40001| 32-bit sig. integer| | -99999(0xFFFE7961)
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)| R| 03| 94| 40095| 40001| 32-bit uns. integer| | 99999(0x0001869F)
Temperature °C| R| 03| 100| 40101| 40001| 32-bit float| |
Temperature °F| R| 03| 200| 40201| 40001| 32-bit float| |
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|

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).
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) Using a multiplier and an offset allows precise adjustments to the sensor readings, ensuring accurate temperature 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.