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7.
The buzzer alarm can be turned off with any key. The alarm automatically turns off after 120
seconds. The alarm output will be reset to low again once the temperature reading stays
within the preset temperature threshold range.
cOmmUNIcATION mODE
The module can connect to computer through serial connection. The RS232 Protocol for the
module is 9600.8.n.1
A complete data transmission cycle consists of 16 byte data:
Byte
0
Starting Byte with Constant value 0xAA
1
Starting Byte with Constant value 0xAA
2*
Integer portion of the temperature value detected through CH1
3
Bit 0-3 – the decimal portion of the temperature value detected through CH1
Bit 4 – CH1 min. temperature alarm icon on/off (1/0)
Bit 5 – CH1 max temperature alarm icon on/off (1/0)
Bit 6 – CH2 min. temperature alarm icon on/off (1/0)
Bit 7 – CH2 max temperature alarm icon on/off (1/0)
4*
Integer portion of CH1 preset min. temperature value
5
Decimal portion of CH1 preset min. temperature value
6*
Integer portion of CH1 preset max. temperature value
7
Decimal portion of CH1 preset max. temperature value
8*
Integer portion of the temperature value detected through CH2
9
Bit 0-3 – the decimal portion of the temperature value detected through CH2
Bit 4-7 not used
10*
Integer portion of CH2 preset min. temperature value
11
Decimal portion of CH2 preset min. temperature value
12*
Integer portion of CH2 preset max. temperature value
13
Decimal portion of CH2 preset max. temperature value
14-15
CRC Checksum = the sum of all the values from Byte 2 to Byte 13
The value 0xFF represent error or the sensor not connected
Bit 7 = 0, positive temperature. Bit 7 = 1, negative temperature.
Example
For 15.1°C, the integer portion is 0x15
Bit 7
Bit 6
Bit 5
Bit 4
0
0
0
1
and the decimal portion is 0x01
Bit 7
Bit 6
Bit 5
Bit 4
0
0
0
0
For -12.3oC, the integer portion is 0x92,
Bit 7
Bit 6
Bit 5
Bit 4
1
0
0
1
and the decimal portion is 0x03
Bit 7
Bit 6
Bit 5
Bit 4
0
0
0
0
DISpOSAL
Electronic devices are recyclable waste and must not be disposed of in the household
waste.
At the end of its service life, dispose of the product according to the relevant statutory
regulations.
TEchNIcAL DATA
TCM 220
Input voltage:
+3 V/DC
Current consumption:
20 μA or 50 mA (with backlight on)
Input channel:
2
Measure rate:
2 seconds or 10 seconds
Accuracy of measurement:
±1ºC
Resolution:
0.1ºC
Measuring temperature
-30 to +70°C
range:
Display:
3½ LCD, 10 mm digit height
Operating temperature range: -10 to +50°C
Dimensions (W x H x D):
48 x 24 x 15.5 mm
Bit 3
Bit 2
Bit 1
Bit 0
0
1
0
1
Bit 3
Bit 2
Bit 1
Bit 0
0
0
0
1
Bit 3
Bit 2
Bit 1
Bit 0
0
0
1
0
Bit 3
Bit 2
Bit 1
Bit 0
0
0
1
1
TCM 320
3½ LCD, 14 mm digit height
72 x 36 x 15 mm
Legal notice
These operating instructions are a publication by Voltcraft®, Lindenweg 15, D-92242 Hirschau/Germany, Phone +49 180/586 582 7
(www.voltcraft.de).
All rights including translation reserved. Reproduction by any method, e.g. photocopy, microfilming, or the capture in electronic data processing
systems require the prior written approval by the editor. Reprinting, also in part, is prohibited.
These operating instructions represent the technical status at the time of printing. Changes in technology and equipment reserved.
© copyright 2012 by Voltcraft®
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