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Digital temperature sensor
The TM digital temperature sensor makes the easy measurement of temperature possible and
allows transmission of the measured data to a PC. The data are transmitted in a simple ASCII
protocol, within which the temperature values are given directly in degrees Celsius (°C).
The sensor is connected to a PC via a standard RS232 serial port. The accuracy of this sensor is
±0.5 °C within temperature range from –10 °C to +85 °C; the measurable range is from –55 °C to
+125 °C.
Features
... The measurable range is from –55 °C to +125 °C, with a 0.1 °C resolution.
... Direct output in °C, ASCII communication, there is no need to recalculate the values
... Connection to the serial port RS232 of a PC
... No need for a power supply
... Software for Windows free of charge
... Easy to use within customer's software solutions
... (attached you can find DLL libraries, the source code, and a detailed description of
communication)
Use
... Temperature measurement in living areas, warehouses, server rooms and on production
premises
... Measurement of outdoor temperature
... An interesting addition to your website design
Connection
The TM sensor is connected to the serial port of a PC or another device. If the serial port has a 25pin connector, you will have to use a 9/25-pin adapter (not included). Install the temperature
sensor at the location where you wish to measure the temperature.
Technical parameters
Measurable range . . . . . . . . . . . . . . . . . . . . . –55 to +125 °C
Accuracy . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±0.5 °C within range from –10 °C to +85 °C
and ±2 °C outside of this range
Resolution . . . . . . . . . . . . . . . . . . . . . . . . . . . 0,1°C
Operating temperature of electronic . . . . . . . –40 to +85 °C
Communication . . . . . . . . . . . . . . . . . . . . . . . ASCII, described below
Measurement speed . . . . . . . . . . . . . . . . . . . the first measurement within 1 sec, subsequently
once per 10 sec ±2 %
Communication line. . . . . . . . . . . . . . . . . . . . RS232 (simplified)
Communication parameters . . . . . . . . . . . . . 9600 Bd, 8 bits, 1 stop-bit, parity – none
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Description of functions
The TM temperature sensor is supplied with power from the serial port to which it is connected.
As soon as the DTR signal is set on the port, the sensor measures the temperature value and sends
it to the connected PC as an ASCII character string. If the DTR signal remains active, the TM sensor
measures and sends the temperature value every 10 seconds. The yellow indicator on the
connector is lit when the actual measurement is being taken. The standard workmanship of the
sensor is mainly used for the measurement of air temperature.
Connector specification
The TM sensor is connected to a PC serial port with a CANNON 9 connector. A standard 9/25-pin
adapter must be used if the PC's serial port is equipped with CANNON 25.
pin
signal
2
4
5
RxD – data from the sensor – temperature values
DTR – sensor power supply and control
GND – signal grounding
Communication protocol
The TM temperature sensor can be used with our software provided free of charge, or certain
terminal (Term, Telix) or other programs. User-created software is an admissible option, the
communication protocol is simple.
Input: PC
TM
Function
DTR signal setting
Sensor activation
Continuous setting
of the DTR signal
The temperature values are
measured and sent automatically
Output: TM
PC
<sign><3 characters – integer °C>
<decimal point><1 character – tenths of °C>
<C><Enter>
E.g.: +025.3C
Measurement of temperature at several points
If you need to measure temperature at several remote points, we recommend that you use similar
sensors, all marked TQS3. If you buy at least 3 TQS3 sensors from us, we will deduct the price of the
TM sensor from your payment. More information can be found at www.papouch.com/en .
Thermometers for Ethernet and USB ports
If, for whatever reason, it is impractical for you to use a thermometer connected via RS232 serial
interface, we can recommend a TME (Ethernet/IP) or TMU (USB) thermometer. More information
can be found at www.papouch.com/en .
Papouch s.r.o.
www.papouch.com
Strasnicka 3164/1a
102 00 Praha 10
Czech Republic
tel.: +420 267 314 267
fax: +420 267 314 269
gsm: +420 602 379 954
mail: [email protected]
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