User manual

Chapter 4 Configuration
Page 31 Dec 2009
If there is no message available at this index, the output is the string
ERROR.
4.2.3 Network Signal Survey
As an aid to network planning, the 605M-D1 provides a feature to scan all available network channels, and report the
signal quality and network name of any detected signals.
To perform a network survey, Issue the command:
AT#CSURV
The modem will respond with the message:
Network Survey Started …
A short time later, the modem will list all detected stations, along with information about each station.
The important values reported are:
rxLev: - This is the received signal level in dBm. A smaller number (less negative) indicates a better signal.
mcc, mnc – These are the Mobile country code and mobile network code. These can be used to identify the network
that the detected base station is a part of.
Some useful country codes and network codes are listed in Appendix C.
4.2.4 Jamming Detection and Reporting
The Jamming Detect & Report feature allows a ELPRO 605M-D1to detect the presence of a disturbing device such
as a Communication Jammer and give indication to the user and/or send a report of that to the network.
This feature is accessed via the #JDR command.
This feature can be very important in alarm, security and safety applications that rely on the module for the
communications. In these applications, the presence of a Jammer device can compromise the whole system
reliability and functionality and therefore shall be recognized and reported either to the local system for
countermeasure actions or to the network providing remote actions.
When Jamming Detection is enabled, the modem will issue a message from it’s RS-232 serial port whenever a
jamming signal is detected. This message will be “#JDR JAMMED”. If the jamming signal is no longer detected, the
modem issues the message “#JDR OPERATIVE”. The modem may also be configured to report the status a
jamming signal on a regular (3 –second) time period.
To disable Jamming detection, issue the command “AT#JDR=0”
To enable Jamming detection with status reporting on change of status, “AT#JDR=2”
To enable Jamming detection with 3-second status reporting, “AT#JDR=4”
4.2.5 Configuring the GPRS Access
The GPRS access configuration is done by setting:
• the GPRS context number 1 parameters (see +CGDCONT command)
• the Authentication parameters: User Name and Password (see commands #USERID, #PASSW)
Configuring the Embedded TCP/IP Stack
The TCP/IP stack behaviour must be configured by setting:
• the packet default packet size (see command #PKTSZ)
• the data sending timeout (see command #DSTO)
• the socket inactivity timeout (see command #SKTTO)