Temp-232

A simple digital thermal sensor, communicating over RS-232 interface by a simple text protocol. Does not require power supply, the sensor is powered from PC's serial port.

The measured temperature is sent directly in °C by a simple text protocol. The sensor sends the measured value regularly (in predefined interval) or as a respond to a request according to a specific Question-Answer protocol.

The thermal sensor uses an integrated element with accuracy of ± 0,5°C for temperature measuring. LED indicates that temperature measuring is in progress.

Application

Temperature measuring systems
Industrial measuring and regulation
Temperature measuring in warehouses, production and residential premises
After connection to Poseidon - measuring in technological premises and transferring data via Ethernet

Basic properties

The sensor is connected to PC over standard RS-232
Temperature measuring in range from -55°C to +125°C
The sensor address and a period of automatic temperature reporting can be set in terminal SETUP mode
It can operate in Question-Answer mode
LED indication of measuring
Simple communication protocol
Does not require power supply, powered directly from PC serial port
The sensor cooperates with SNMP thermometer Poseidon

Downloads & Datasheets

Temp-232 - Datasheet
Poseidon / Sensors - Other sensors compatible with the Poseidon system

Technical specifications

Basic parameters
+ Range of measured temperature	-55°C to +125°C
+ Resolution format	0,1 °C
+ Measurement accuracy	+/- 0,5 °C in range from -10°C to +85°C +/- 2 °C in range from -55°C to +125°C
Communication
+ Measuring speed	Respond to query within 50ms at maximum, measuring itself 1x within a second
+ Measuring element	DS18B20
+ Data format	ASCII, described in specification
+ Communication parameters	9600 8N1
+ Communication line	RS-232 (RxD, TxD, GND, DTR, RTS)
+ Status indication	Red indicator blinks at every measuring, ligths constantly in Terminal Setup mode
+ Function modes	Auto-Report / Question-Answer
- Auto-Report mode	Temperature reported automatically in defined time, period 1 .. 255 [seconds]
- Question-Answer	Temperature reported on request according to protocol (request by a "t" character)
+ Temperature format	„+028.0C<CR><LF>“
+ Access to SETUP mode	Sends „u“ (117 DEC) character 20x after turning on
+ Turning on thermometer	Setting DTR or RTS to „On“ value

Sensor installation:

Connect Temp-232 to PC port
Run terminal program, choose serial port where the Temp-232 is connected, set speed to 9600, port parameters 8N1, RTS and DTR output to „ON“
In the terminal a temperature value will start to appear (in 2 second interval, preset in factory)

SETUP Terminal mode

Turn on the thermometer (Set DTR or RTS to „On“ = +12V)
Access the SETUP mode by sending cca 20 „u“ (117 DEC) characters after turning on.
You can just hold the "u" key until the LED of the thermometer lights up.
Choose parameters in Setup mode using the first letters of the desired command

DB9F on the cable

1	-	-	Not used
2	TxD	<--	Transmit Data
3	RxD	-->	Receive Data
4	PWR	-->	PWR input (from the DTR output)
5	GND	---	System Ground
6	-	-	Not used
7	PWR	---	PWR input (from the RTS output)
8	-	-	Not used
9	-	-	Not used

Ordering

Sensor samples are already available! We recommend ordering a standard "600 051 Temp-232 1.5m" version. Products are in stock in several pieces most of the time. The price can be found on the Pricelist page.

OID	Temp-232 type detailed description
600 051 >Quotation	Temp-232 1.5m Temperature sensor encased in black covering (preferred type), cannon DB9M, sensor on 1.5 m cable.
600 052	Temp-232 052 Temperature sensor encased in a brass 8mm thread, 50mm long
600 053	Temp-232 053 Sensor encased in a brass 50mm long shape with 8mm thread, assembled on DB9 cover (without cable).

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