HC25 AT Command Set - Portech.com.tw

HC25 AT Command Set
2.11 AT^SCFG
s
(num)
Radio/Band: Enable/disable frequency band(s)
The parameter can be used to select or deselect one or several frequency band(s) the ME is allowed to register
to. The value of may be one of the single bands listed below or an appropriate band combination. To
specify a band combination calculate the sum of the values of all desired bands.
Any change to this parameter will take effect after reboot. So, is a parameter that may be used to read
out the current band combination any time, but is primarily intended for reinitializing the ME after next restart.
Parameter is global for all interfaces, non-volatile and will not be reset by AT&F.
1 GSM 900
2 GSM 1800
4 GSM 850
8 GSM 1900
16 WCDMA 2100 (BC1)
32 WCDMA 1900 (BC2)
64 WCDMA 850 (BC5)
(num)
Radio/Band/Group: Specify frequency band group
The "Radio/Band/Group" feature enables the HC25 to start searching a network inside a band combination
specified by . The purpose of this feature is improving the band search if the ME is expected to operate
in different band groups. If the ME is not required to move around in different band groups the default settings
of and can be left unchanged.
Writing modifies the allowed bands (see ) immediately and causes the ME to restart a network
search based on the new setting:
Writing value 0 will restrict the allowed bands to the EU band group (= 19).
Writing value 1 will restrict the allowed bands to the US band group (= 108).
Writing value 2 will re-enable all supported bands (= 127).
Changing the allowed bands with takes effect without reboot and is non-volatile.
Execution of the write command AT^SCFG="Radio/Band/Group, causes the ME to deregister from and
re-register to the network. Therefore, it is useful to have the URC "+CREG" enabled. The status of the SIM PIN
authentication remains unchanged, eliminating the need to enter the SIM PIN again after the change. To query
the allowed bands set with use the read command AT^SCFG="Radio/Band, which displays .
0 All frequency bands typically supported in European countries:
GSM 1800, GSM 900, WCDMA 2100
Value 0 is equivalent to = 19.
1 All frequency bands typically supported in North American countries:
GSM 850, WCDMA 850, GSM 1900, WCDMA 1900
Value 1 is equivalent to = 108.
2 This option can be used to re-enable all supported bands immediately without
reboot if the allowed bands have been restricted, e.g. after setting "0"
or "1" or after selecting a specific provider with AT^SNWS.
Value 2 is equivalent to = 127.
Example: A typical use case of "Radio/Band/Group" may be improving a change from EU to US bands. The
same scenario will work in the opposite direction (US to EU).
• Precondition: All bands enabled (= 127), ME is registered in an EU band.
• Enter AT^SCFG="Radio/Band/Group",1. ME deregisters, changes to US band group, searches US bands
only and registers in US band group.
• Enter AT^SCFG="Radio/Band/Group",2. ME deregisters, enables all bands, and re-registers quickly to US
without searching the EU bands. Allowed bands are not restricted (= 127).
HC25_ATC_V01.200 Page 42 of 290 7/25/07
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