Appendix B. Useful Configuration Commands
B-5
Unlike earlier modems sold by Campbell Scientific Ltd, the COM111 is a full
quad band modem for GSM/2G connections. It also supports EDGE
communications if the local network supports it. By default the modem will
switch automatically over the frequencies of 850/900/1800/1900 MHz bands
which covers use on 2G networks around the world, so no reconfiguration is
normally needed.
If it is necessary to fix the 2G band use a terminal emulation program, such as the
Device Configuration Program to enter the
AT+WMBS=<band>,0
command.
The table below gives the commands for various band(s) selection
:
AT+WMBS Band Selection
AT+WMBS=0,0
Select mono band mode 850 MHz
AT+WMBS=1,0
Select mono band mode extended 900 MHz
AT+WMBS=2,0
Select mono band mode 1800 MHz
AT+WMBS=3,0
Select mono band mode 1900 MHz
AT+WMBS=4,0
Select dual band mode 850/1900 MHz
AT+WMBS=5,0
Select dual band mode extended 900 MHz/1800 MHz
AT+WMBS=6,0
Select dual band mode extended 900 MHz/1900 MHz
AT+WMBS=7,0
Select quad-band mode 850/900E (extended)/1800/1900
MHz*
*The default setting in Europe.
After issuing the command the COM111 module will have to be reset, by power
cycling the module to change to the new specified band(s). The setting is stored in
non-volatile memory automatically.
To check the Band(s) Selection
To check the band selection for the COM111, use a communication software such
as HyperTerminal, then enter
AT+WMBS?
command.
The table below gives the main responses returned:
AT+WMBS Responses
+WMBS: 0, x
Mono band mode 850 MHz is selected
+WMBS: 1, x
Mono band mode extended 900 MHz is selected
+WMBS: 2, x
Mono band mode 1800 MHz is selected
+WMBS: 3, x
Mono band mode 1900 MHz is selected
+WMBS: 4, x
Dual band mode 850/1900 MHz are selected
