P.14 Maestro M110 Series
www.maestro-wireless.com
If communications cannot be established with the modem, check;
•
The RS-232 physical connection
•
The RS-232 configuration
After the communications between the both has been established, refer to below AT
commands for start using the modem.
AT Command
Description
AT+CGMI
To check the module manufacturer identification
AT+CPIN=XXXX
To enter a PIN code (if required) (XXXX is actual PIN)
AT+CSQ
To verify the received signal strength
AT+CREG?
To verify the network registration status
ATD<phone number>;
To initiate a voice call
ATH
To end the above voice call
7.3
Received Signal Strength
The modem can only establish a call or data session when the received
signal strength is sufficient. In terminal window, enter AT+CSQ to see the
received signal strength, then the modem will response in the below format;
+CSQ: <RSSI>,<BER>
or
<RSSI>,<BEP>
or
<RSSI>,<ECN0>
or
<RSSI>,<RSRQ>
where;
<RSSI>
: Received Signal Strength Indication
<BER>
: channel Bit Error Rate (GPRS)
<BEP>
: channel Bit Error Pattern (EGPRS)
<ECN0>
: Energy per Chip Noise ratio (UMTS)
<RSRQ>
: Reference Signal Received Quality (LTE)
For SMS, voice and data operation, please refer to the below table for
sufficient RSSI levels;
RSSI Level
Description
6 to 8
SMS/Voice
10 to 12
SMS/Voice/Data
13 to 31
All of above, to maximum RSSI level
99
Not measurable
