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
EG_GenPro25e_1055_UG_000_UK Page 29 / 66
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
5.4 Echo function of AT commands deactivated
The modem contains the transparent mode application (see the documents
"ublox_AT_Commands_Manual_xxx.pdf"; in this case, if no echo is returned when entering an AT command,
it means that:
- the "local echo " of your communication software (like Hyperterminal) is not activated,
- the echo function of the modem has been deactivated.
The echo function can be set with the command ATE ; it requires a back-up with the command AT&W and
AT+CFUN=15
To activate the echo function of the modem, enter the commands ATE1
When sending AT commands to the modem using a communication software, it is recommended to:
- Deactivate the "local echo" parameter in your communication software (like Hyperterminal),
- Activate the echo function of the modem (the command ATE1).
For a communication Machine to Machine with the modem, it is recommended to deactivate the echo
function of the modem (the command ATE0) in order to avoid the CPU receiving redundant responses.
For more information about the ATE commands, see the document
"ublox_AT_Commands_Manual_xxx.pdf".
5.5 Checking the quality of the GSM reception signal
The modem will be able to make a call only if the GSM signal received is sufficient.
The command AT+CSQ allows to know the reception level (rssi) of the signal sent by the closest GSM Base
Transceiver Station (BTS), as well as the receive bit error rate (ber).
When the SIM card is inserted and the PIN code entered, the command AT+CSQ allows to measure the
signal from the BTS of the subscribed operator network.
To check the quality of the GSM signal, do the following operations:
Use a communication software like Hyperterminal, enter the command AT+CSQ.
The response is in the following format:
+CSQ : <rssi>, <ber> with :
<rssi> = indicates the reception level,
<ber> = receive bit error rate.
Check the returned value <rssi> with the help of the table below.