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Gibberish on a serial line usually means one of two things:<br />
<br />
a) The speed at one end is set incorrectly (4800 vs 115200, for example)<br />
<br />
b) The framing at one end is set incorrectly (7 bit mark vs 8 bit space, for example)
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Gibberish on a serial line usually means one of two things:

a) The speed at one end is set incorrectly (4800 vs 115200, for example)

b) The framing at one end is set incorrectly (7 bit mark vs 8 bit space, for example)

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I have an serial communication interface application in vb.net. It was working fine earlier but now I am getting &quot;?&quot; Instead of data. Not able to understand why it is happening like that. Kindly help. <br />
Thanks in advance
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I have an serial communication interface application in vb.net. It was working fine earlier but now I am getting "?" Instead of data. Not able to understand why it is happening like that. Kindly help. 
Thanks in advance

Issue related to serial port data

Visual Basic .NET (VB.NET) is an object-oriented programming language implemented on the .NET framework, but also supported on other platforms such as Mono and Silverlight. Microsoft launched VB.NET as the successor to the Visual Basic language. Though it is similar in syntax to  Visual Basic pre-2002, it is not the same technology,