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Small data logger with rs232 communication
 Data Logger
About the device in general
Data Logger is a small device based on single pic processor and i2c memory.
It will record information in preset intervals of time (in this case we are recording temperature).
The device is equipped with embedded control software. It can be reprogrammed to take measurements at any intervals (between 1 min and 255 hours intervals).
It has exceptional one short interval of 4 seconds for debugging purposes. In order to use this interval the user must configure the device to 0 hours and 0 minutes.
By configuring the device for 4 seconds, the user can obtain online continuous measurements
Potential users
Potential users of the device are customers who want to record data in regular intervals of time in remote location.
The device has 7 inputs from which one is configured as A/D convertor and the rest are digital inputs.
Technology
The device is cheap, small, light and very well temperature compensated.
It can survive temperatures from -40 to +70 degrees Celsius.
This model is capable of storing 1Kb information.
However its capacity can easily be extended by just replacing or adding second i2c memory.
The used memory EEPROM will keep the data for years even if the batteries are removed.
Two AAA 1.5V batteries are used for power supply. This can provide power supply for years due to the minimum consumption and working frequency of the processor.
In comparison to other data loggers, which require special communication software, this prototype has embedded terminal and can communicate with any terminal connected to any serial port. The communication protocol is RS232 and uses parameters: 300b/s 8,1,n.
Communication
The terminal menu allows three operations: seeing the stored data, changing the time interval for recording data or seeing the preset parameters and current progress.
During operation the device has one LED as indicator and one button for changing the operational mode (menu/work). Also every recorded value is sent to the RS232 port for monitoring and calibrating purposes even if the port is disconnected.
Additional energy saving is realised by using self powered RS232 port (the device does not supply the port with energy. It only controls the port by switching it on/off).
The communication with the device requires standard null-modem cable with only 3 connections ( RS232 serial 9 pin plug needs only pin 2,3 and 5 connected).
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