Call A Remote Modem Using A Local Modem Connected Via USB?
Oct 12, 2011
I am attempting to call a remote modem using a local modem connected via USB. Programming language is VB.NET and I am using the SerialPort control to talk to the modem.
Communication is as follows:
I send: ATZ0[CR]
Modem responds: ATZ0[CR][CR][LF]OK[CR][LF]
I then try to dial a number:
I send: ATDTnnnnnnnnnn[CR] where nnnnnnnnnn is a valid number
The modem responds with:ATDTnnnnnnnnnn[CR][CR][LF]ERROR[CR][LF]
All other commands seem to work without any issues
For info the modem is a MultiTech MT5634ZBA-USB-V92
If I use hyperterminal and type the same commands in it works as expected and dials the number, so it must be something I am doing in my code, possible some setup in the SerialPort control
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AT+VTX
AT#VTX
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Imports System
Imports System.IO.Ports
Public Class Form1
[code].....
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Handles serialPort.DataReceived
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SMARTLoa
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[code].....
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M[Code]...
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[Code]....
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[Code]...
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