TM: RS232 thermometer, cable 2,8m

TM is a cheap RS232 serial thermometer with measuring range from -55°C to +80°C. It communicates in a simple ASCII format. Digital sensor TM can very easily measure temperatures and transmit those m...more information
Thermometer for serial port RS232
21,10 EUR excl. VAT 25,53 EUR incl. VAT
More than 20 units in stock
Personally in Prague:within two daysWith a delivery company:at the latest Wednesday 19.6.
Order CodeTMWarranty36 monthsCustoms Code90251900Weight106
Thermometer for serial port RS232
Thermometer for serial port RS232

TM is a cheap RS232 serial thermometer with measuring range from -55°C to +80°C. It communicates in a simple ASCII format.

Digital sensor TM can very easily measure temperatures and transmit those measured-out values to a PC. As a transfer protocol TM uses a simple ASCII format so there is no conversion needed (Output directly in degrees celsius °C). It is connectrd to the PC via a COM port (RS232).

Features of simple serial thermometer

  • Measures temperatures from -55°C to +80°C, 0,1°C resolution
  • Output is in ASCII format in °C, no conversion needed.
  • Connects to a serial port (COM)
  • Port powered
  • Wix software included (freeware)
  • Easily integrated in own applications (DLLs, souce codes and communication description provided freely)


  • Temperature meaurement for living areas, warehouses and manufacturing areas.
  • Outside temperature measuring (waterproof sensors available on request)
  • Local area information on your WEB site - internet thermometer

Sensor cable length

Standard cable length is 2,8m. Other lengths available on request. Maximum cabnle length is 20m


Connection of RS232 thermometer

TM Thermometer is to be connected to your PS's COM port (Serial port). Sensor is to be located in the area you need to measure.

Technics Specifications

Measurement range -55°C to +80°C
Accuracy ±0,5°C in range -10°C to +80°C, otherwise ±2°C
Resolution 0,1°C
Resolution ASCII, described below
Measurement rate

First readout 1s,then 1x in 10s ±2%

Communication line RS232 (COM port; simplified)

Thermometer function description

TNM is connected and powered from a serial port (COM). Once the DTR signal is activated, TM measures temperature and sends it to the PC in ASCII format as a string. When DTR is active continuously, TM sends the current temperature every 10s. This is indicated by an LED on the RS232 connector. Standard sensor is fo atmospheric measurements only.


TM only has on serial connector (CANON9, DSub9) that is to be connected directly to a PC.

Used signals are in the table:

pin RS232 signal
2 RXD Recieves data from the sensor - measured temperature
4 DTR Powers and controls the sensor
5 GND Signal grounding

Thermometer communication protocol

TM can be easily used with a supplied software (WIX), custom software or any terminal (TeraTerm, Telix, hyperterminal). Customer made softweare is another option as the communication protocol is very simple.

(from PC to TM)
Function Output (from TM to PC)
DTR signal active Power on, measurement <sign><3 characters - 
°C><decimal point><1 character - decimals><C><Enter>
Example: +025.3C
DTR signal continuously active Periodic sending of a current temperature

TM service ... a Windows service to view TM or TMU temperatures

TMservice is a resident service for Windows OS, which can be used to view TMU or TM thermometers. It can watch set-up thresholds, store measured-out values and inform users about the sensor. More info...


Datasheet and Manual for TM

File size: 68 kB

Date: 09-06-2019


Wix - Free version of measurement software, version
Software for measurement, storing values, controlling and viewing measured-out values from Papouch s.r.o. devices (or others if integrated with for example MODBUS).
(Restrictions in the free version can be removed by purchasing a license.)
Go to Wix main page...

File size: 3.1 MB

Date: 08-31-2018


Software for TM (or TMU via Virtual COM port) DLL, simple software including the source code

File size: 1.1 MB

Date: 01-26-2011


Sample software to be used with WinAPI. (Complied application and source codes for Delphi.)

File size: 26 kB

Date: 01-26-2011


Simple example of how to process the temperature form TM for .NET. Includes source codes and compiled application. Works as a practical example of the communication with TM sensor in .NET

File size: 19 kB

Date: 01-26-2011


DLL library to work with TM, drivers to work with TM, TME and TMU.

File size: 71 kB

Date: 01-26-2011



ADsoft company software.

File size: 676 kB

Date: 01-26-2011


Compiled firmware for PIC12C508 processor. Program is a freeware, it contains Papouch logo.

File size: 784 B

Date: 01-26-2011


Compiled firmware for PIC12F675 processor. Program is a freeware, it contains Papouch logo.

File size: 813 B

Date: 01-26-2011



Munin plugin - Plugin for TM thermometer to work with Munin system. Plugin is suitable for monitoring temperature in server room etc. Author: Jan Krejci

File size: 615 B

Date: 01-26-2011



Script for GCC

File size: 6.8 kB

Date: 01-26-2011




File size: 8.1 kB

Date: 01-26-2011


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