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- necessary to install suitable drivers, which interpret the device as virtual COM port
- if data logger is disconnected from the computer often, it is suitable to use always the same
USB socket (if using different USB socket operational system can consider as different port
and user PC program does not recognize this change)
c)
communication interface Ethernet - connect data logger Ethernet interface by means of suitable
UTP cable with RJ-45 connector to existing LAN network.
+ practically unlimited distance between data logger and computer
+ communication and sending alarm messages by means of several network protocols is
enabled
+ mostly it not necessary to build other cabling
- higher interface price
- it is necessary to cooperate with network administrator (address allocation, ...)
- more difficult trouble shooting
d)
communication interface RS485
–
connect data loggers and the computer to the RS485 bus (max.
1200m).
+ network is autonomous, operation is not dependent on third parties
+ up to 32 data loggers can be connected to one RS485 network
- special independent cabling must be routed, higher labour consumption and price
- external converter must be used at computer side to connect computer
e)
RS232 communication interface with GSM modem for work with data logger and for SMS
messages
–
connect data logger communication interface RS232C to
preconfigured
GSM modem,
second modem will be at computer side
+ practically unlimited distance between computer and data logger (depend on coverage of
operator signal)
+ SMS messages can be used
- communication and SMS messages are charged by the GSM operator
- operation reliability depends on third party
There must be GSM modem also at the computer side and data logger must be configured to
communication interface RS232. Then all usual communications can be performed by means of user
program via GSM network. Also SMS messaging can be used. Testing of incoming SMS messages and
sending of alarm SMS messages is performed with the 2 minutes interval, if data connection is not
active. If there is an active connection, SMS messages are not received and sent until connection is
deactivated.
3.6.
Connection of data logger with support of SMS messaging
C
onnect data logger
communication interface RS232C to preconfigured GSM modem.
Case when GSM modem is used not only for SMS messages, but also for communication with data
logger is described above. If data logger is connected to the computer by means of different interface
than RS232, GSM modem can be connected to RS232 connector and used for SMS messaging. For
detailed description see Appendix No. 3
3.7.
Connection of data logger to power
Data logger is powered from suitable power source (can be ordered). When powered from a different
source it is necessary to use dc voltage at range specified in technical parameters of data logger. Data logger
consumption in different variations is specified in Appendix No. 1. Appendix No. 1 describes also several
possibilities of data logger power back-up.