Denso BHT-400-CE Reference Manual page 312

[Ex.] Send the len(byte) data when there is no longer any data in the send buffer.
[VB]
If MyComm.OutBufferCount = 0 Then
MyComm.Output(buffer, 0, len)
End If
[C#]
if (MyComm.OutBufferCount == 0)
{
MyComm.Output(buffer, 0, len);
}
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