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NO CARRIER

Posted on 2003-12-02
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Last Modified: 2013-12-27
I'm building a VB app that communicates with a noise station though a modem line. So far i've been able to establish a connection with the remote modem. I send the command MSComm1.Output = "ATDT96477599" & vbCrLf to establish the communication and get "CONNECT 300" as a response. Then I need to login the noise station, so I send my password like this MSComm1.Output = "password" & vbCrLf. I get a stange response that consist on an unreadable string. Then after, if I try to send another command I get the response "NO CARRIER". I don't know what it means. Any help would be much appreciated.

Thanks

Rufen
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Question by:Rufen
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by:lidsky
ID: 9858619
It probably means that the modem on the other end hung up. Is the other side configured to hang up if the password is incorrect?
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by:lidsky
ID: 9858706
Also, since you seem to be receiving some rubbish back it may be that the phone line is very noisey, which may be causing the modem to hang up. This seems to be the case as your modem is negotiating a speed of only 300bps, or are you initializing the modem to that speed?
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by:lidsky
ID: 9858726
BTW, what is a noise station?
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by:Rufen
ID: 9859497
Thanks everyone for your reply. I finally solve the problem. I just had to set the maximum port speed property to 300 and it works fine. For your information, a noise station is a station that records sound data related (dba). It is mainly used in airport or in factory to monitor sound level. You can have a look at Brüel & Kjaer web site to learn more. (I don't mean to do any publicity).

Rufen
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