User guide
Table Of Contents
- Presentation
- Warning
- Copyright
- 1 References
- 2 Packaging
- 3 General presentation
- 4 Characteristics and Services
- 5 Use of the modem
- 5.1 Starting with the modem
- 5.2 Specific recommendations for the use of the modem in vehicles
- 5.3 GSM led of the modem
- 5.4 Echo function of AT commands deactivated
- 5.5 Checking the quality of the GSM reception signal
- 5.6 Verification of PIN code
- 5.7 Verification of modem registration on GSM network
- 5.8 Verification of modem registration on GPRS network
- 5.9 Verification of internal voltages of the modem
- 5.10 Main AT commands (HAYES)
- 5.11 Turning OFF the modem
- 5.12 Updating procedure of the modem
- 6 Trouble Shooting
- 7 Functional description
- 8 Technical characteristics
- 8.1 Mechanical characteristics
- 8.2 Electrical characteristics
- 8.3 Environmental characteristics
- 8.4 Standards/Conformities
- 9 Security recommendations
- 10 Recommended accessories
- 11 Client support
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Descriptions and non-contractual illustrations in this document are given as an indication only.
ERCO & GENER reserves the right to make any modification.
Dct_427_01
Table 8 : RSSI value
<rssi> value
Gain in dbm Interpritation
<ber> value
Interpretation
0 -113 dbm Insufficient 0 to 7
See Standards ETSI
GSM 05.08
1 to 10 -111 to -95 dbm Insufficient
11 to 30 -93 to -53 dbm Sufficient
31 (max) -51dbm Perfect
99 Unknown/not detectable 99 Unknown/not detectable
The GSM modem works normally with a minimum <rssi> between 11 and 15.
Bellow 10, the signal level is insufficient; the modem cannot work depending on the geographical situation or
the vehicle mobility. Above 15, the signal is satisfactory.
For more information about AT commands, see the document "u-blox_AT_Commands_Manual_xxx.pdf"
5.6 Verification of PIN code
The modem contains the EGM standard library (see the documents "EG_EGM_CL_xxx_yy" of ERCO &
GENER); in this case, the PIN code is necessary to make a call or to accept a response coming from the
GSM network. This code is held in the SIM card, and it can be modified by the user.
To check that the PIN code has been entered, use a communication software like HyperTerminal, and enter
the command AT+CPIN?
The table below shows the main responses given by the modem:
Table 9 : Verification of PIN code
Command Response Interpretation
AT+CPIN?
+CPIN : ERROR
The SIM card is absent or not
recognized
+CPIN : READY
The PIN code is correct
+CPIN : SIM PIN
The PIN code is wrong or not entered
yet
+CPIN : SIM PUK
The PUK code is required
For more information about AT commands, see the document "ublox_AT_Commands_Manual_xxx.pdf"