Installation manual
UNIPOWER
Installation manual PQ Secure
43
7.3 GSM modem
There are many GSM modems available, check with your Unipower representative for
recommendations of units that work. You must carry out certain preparations before a GSM modem
can be installed on site. You must first ensure that there is GSM coverage otherwise an additional
antenna may be required. You also need to think about where the modem will be installed, for
example if you want to install it in a metal cabinet or underground, other communication options
should be considered.
Check that the SIM card and mobile operator used support data transmissions. Some
operators’ only offer voice calls - contact the operator and ask. It may be possible to change
the subscription and obtain a new, separate telephone number for data communications.
The first time the SIM card is used, it must be activated using a normal mobile phone so that
it can find its GSM network and register. Remember to remove the PIN code, or the SIM card
will not work with a GSM modem.
The communication speed for the GSM modem is usually 9600 or 19200 baud, and it is
important to set the correct speed in the recorder.
Note: If Unilyzer 902 is used with a GSM-modem, it is the speed ”Computer Port” that should
be set to 9600 baud in PQ Online.
There are two ways you can use a GSM modem, either directly with the measuring device, in which
case the modem is connected using a standard 9-pin data cable for RS-232. Alternatively, the GSM
modem can be connected to other equipment such as a signal converter, in which case a NULL
modem cable is required.
Figure 32
In other respects, the GSM modem is the same as an external modem, and the configuration process
in HyperTerminal is the same except that the speed is set to 9600 or 19200 baud.
Note: If a GSM-modem is used together with Unilyzer 902, the unit should be configured for
communication speed 9600 baud or 19200 baud (depending on which GSM-modem that
is used). This is done under the tab ”Computer Port” in PQ Online.