Using with Campbell Scientific Dataloggers
9
Direct Loggernet IP Pakbus communications
Supports a telnet connection (like the serial terminal mode), including
talk-through modes.
Supports Modbus and DNP3 over IP
Supports serving webpages – which are user defined
Supports requesting data with http commands
Supports acting as an ftp (file) server.
Plus, under program control:
Can send email messages (emailsend)
Can send files by ftp (ftpclient)
Can synchronise the datalogger clock to Internet time
(networktimeprotocol).
Can send data to other loggers via IP (Send/Get variables, files and data)
Can do a normal callback to a Loggernet server (send variables)
Can do a one way transmission to Loggernet or another logger (Senddata)
Can open virtual serial ports to other dataloggers or sensors via the IP
network.
Only standard Pakbus communication with Loggernet is possible if
using the TCP/IP function built into the modem. The other
advanced communications options require a datalogger capable of
running its own TCP/IP function. Those loggers currently include
the CR800 series, CR1000 and CR3000 dataloggers.
5.1 Network coverage
The same considerations as outlined in Section 4.1 above apply in terms of the
type of network and signal strength required for GPRS connections. In general to
sustain a GPRS connection for long periods, slightly higher signal strength is
required compared to use for GSM dial-up connections.
The COM100 is essentially a 2G modem, so will not use 3G network
connections. It does however support some features of enhanced 2G networks
called “EDGE”. Where that is enabled on the local cell, slightly higher data
transfer rates may be achieved.
When testing for coverage and signal strength using a handset if possible limit the
phone to non-3G operation and check both the signal strength and availability of
GPRS or EDGE data signals, which are often indicated by a “G” or “E” symbol
on the display.
5.2 GPRS network contracts and costs
The modem needs to be used with an airtime contract that allows GPRS
communications. Some SIMs are sold as “3G” compatible which means they can
be used in 3G phones too. It is important to check with your supplier that any
SIM supplied will work in a GSM/GPRS phone and that GPRS operation is
NOTE
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