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Modem answers ERROR after an ATZ request

I am creating an application in C language and I faced with a problem of modem. When I need to init the modem (with "ATZ\r" string) while the application is running, I get an ERROR answer from the modem if it answered BUSY the last time. But, when I launch the application and send the "ATZ\r" the first time, all is well.
I'm a beginner with communications with modem, so the error may be quite simple.

Thank you.
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tdehais
Asked:
tdehais
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1 Solution
 
Faruk Onder YerliCommented:
Check your application component speed,Databits (9600 N81)
Probably you are not sending only 'ATZ' & CR..
You check your code & port setting..
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tdehaisAuthor Commented:
I'm not only sending "ATZ\r" but "+++" before in order to obtain the command mode.
Maybe is the fact that when I'm already in command mode and sending "+++" that causes ERROR
How can I test that I'm in command mode ? Sending AT ?
I will check these points...


Thanks.
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Faruk Onder YerliCommented:
if the modem is not connected , You were in command mode.
Send port 'ATZ' + CR code(#13 - Enter char).Certainly you must get ok.

if you dont get ok, try this...
You can loop from com1 to com2 for check ports. send a char com1, listen a char com2.
if you get right chars, ports are ok.
(Please check hex char)
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