Denso BHT-400-CE Reference Manual page 310

[Ex.] Read out all data remaining in the receive buffer.
[VB]
While MyComm.InBufferCount > 0
len = MyComm.Input(buffer, 0, buffer.Length)
End While
[C#]
while (MyComm.InBufferCount > 0)
{
len = MyComm.Input(buffer, 0, buffer.Length);
}
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