SAMBA 75 USER’S GUIDE
VERSION 1.01
not active. The serial interfaces are not accessible. Operating voltage remains
applied.
5.1.3 Alarm mode
Alarm mode restricted operation launched by RTC alert function while the module is
in POWER DOWN mode. Module will not be registered to GSM network. Limited
number of AT commands is accessible.
5.2 Power Up / Power Down Scenarios
In general, be sure not to turn on SAMBA 75 while it is beyond the safety limits of
voltage and temperature. SAMBA 75 would immediately switch off after having
started and detected these inappropriate conditions. In extreme cases this can
cause permanent demage to the module.
5.2.1 Turn on SAMBA 75
SAMBA 75 can be started in a variety of ways as described in the following sections:
•
Power up the modem by connecting it to a PC’s USB port (see
section
6.2.1.1
)
•
Software controlled reset by AT+CFUN command (see section
5.2.1.1
)
After startup or mode change the following URCs indicate the module’s ready state:
•
“^SYSSTART” indicates that the module has entered Normal mode.
Detailed explanations on AT^SCFG, AT+CFUN, AT+CALA can be found in [
3
].
5.2.1.1 Reset SAMBA 75 via AT+CFUN Command
To reset and restart the SAMBA 75 use the command AT+CFUN. You can enter
AT+CFUN=,1 or AT+CFUN=x,1, where x may be in the range from 0 to 9. See [3] for
details. If configured to a fix baud rate (AT+IPR
≠
0), the modem will send the URC
“^SYSSTART” to notify that it is ready to operate. If autobauding is enabled
(AT+IPR=0) there will be no notification. To register to the network SIM PIN
authentication is necessary after restart.
5.2.2 Turn off SAMBA 75
SAMBA 75 can be turned off as follows:
•
Normal shutdown: Software controlled by AT^SMSO command
•
Automatic shutdown: Takes effect if board temperature is out of
range or if undervoltage or overvoltage conditions occur.
5.2.2.1 Turn off SAMBA 75 Using AT Command
The best and safest approach to powering down SAMBA 75 is to issue the AT^SMSO
command. This procedure lets SAMBA 75 log off from the network and allows the
software to enter into a secure state and safe data before disconnecting the power
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