GSM Data Modem Frequently Asked Questions - Scotec - GiSMo ...

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17.9 What are the character set tables supported ? ................................................................... 1417.10 What is the " Message Reference " ? ................................................................................. 1417.11 What is the interest of the PDU mode?............................................................................... 144
1 CALLS-Data1.1 How can I make a DATA call ?- Check that you are properly registered on the network with AT+CREG?Set your desired DATA rate and modulation using AT+CBST= (see AT commandsmanual for further details).Then, issue ATD .If the GSM engine is configured in automatic dialling (AT%D1;), a drop of the DTR signal will createa data call. The number called is in the first location of ADN (SIM phonebook).1.2 What are the Transparent and Non-Transparent modes ?- With the Transparent (T) mode, the GiSMo transmits DATA over the GSM air interface with noguarantee that the data frames are properly received.With the Non Transparent mode (NT) the GiSMo uses the RLP (Radio Link Protocol) to secure thetransmission. The RLP will detect any data corruption and manage any necessary repetition of thedata. For this reason, the NT transmission might be slower than in T mode under poor radioconditions.1.3 Why can't my GiSMo connect to the desired speed (set with AT+CBST) ?- The connect speed is negotiated between both the calling and the remote modem. This is donethrough the network IWF (Interworking Function).It might be that the remote modem or the network does not support the configuration you have set(e.g. some networks do not support 1200 bps). For the settings of the AT+CBST command, pleaserefer to the AT command manual.2 CALLS-Establishment2.1 How can I know if I am registered ?- As a user, you can see the LED way of blinking. If it is blinking slowly, it means the GSM unit isregistered. As an application, you must send the command AT+CREG?, the GSM unit answers with+CREG: x, . Where x is either 0 or 1 and have no meaning about the registrationstatus and gives the status of registration. Please refer to the AT-Commanddocumentation for detailed information regarding this command.2.2 How can I know on which Network the GSM unit is registered on ?- Using the command AT+COPS? the GiSMo answers with the code of the operator on which it iscurrently synchronised (not necessarily registered, because it could be synchronised on thatNetwork in the emergency mode). Also, using the command +WOPN, there is a possibility tocompute the name of the Operator (in alphanumeric format) based on the code answered by the5
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