User guide

CS-GPRS Communications Package
6
Hyperterminal. The setting can also be sent from the datalogger program itself
(contact CS for details of how to do this).
The TCP/IP info box will only show valid IP address values once a
PPP connection has been established.
If you intend to run the modem without turning power off to it and without
resetting the modem under program control, it is advisable to include commands
to reset the modem either at regular intervals or at the start of the dialling process.
The latter ensures the modem logs off the GSM network and reconnects each time
before dialling. This process can extend the dialling process by 10 s or so and
may not function in the same way with all modems. This will only work with an
up-to-date version of the logger operating system that allows “;” to be used to
force delays in the dial string. To reset the modem include the command
AT+CFUN=1 at the start of the dial string, followed by at least five extra “;” to
allow the modem 5 seconds to reset before subsequent commands are sent. This
would make the full dial string, including the APN setting like this:
‘AT+CFUN=1;;;;;;AT+CGDCONT=1,”IP”,”servername”;ATD*99***1#’
You must then select which Net Services you wish to enable under the Net
Services tab. If you are operating with a dynamic IP link (as is common on most
GSM/GPRS links in Europe) then the only relevant service function will be in
setting the Pakbus/TCP server port you will communicate with Loggernet using.
All the other functions are not possible due to the lack of a fixed IP, so can be
disabled.
If you have a fixed IP then you should select which functions you wish to use (see
the NL115 user guide). You must also make sure that any firewall built into the
airtime providers network is opened to allow incoming connection to these
services (and also to the Pakbus port).
NOTE