Quote:
When I connect the modem to my pc, with hyperterminal I write the AT command and the modem does not react.
HyperTerminal and any AT modem can communicate only if settings are corrects. One incorrect setting can be enough to prevent communication from working.
You need to search the correct setting until you see the modem answering to the AT command on HyperTerminal.
Once you got the settings correct, you can go the VB program.
The modem documentation should have informations, but we can't search fir you.
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