Handshaking

Sets or Retrieves the Handshaking/flow control method used by the com port

MSComm32 and Comm32 have similar behavior. (See Remarks below)

Syntax object.Handshaking = value             object Name of the communications control.     value A numerical expression indicating whether flow control is enabled and what method to use.             object.Handshaking = 0 '// Set the value (0 = no flow control)             If object.Handshaking = 0 then    MsgBox("Handshaking is disabled ")  Else    MsgBox("Flow control is enabled") End If '// Retrieves the current setting.             This property can be set to one of the following values   Constants 0 = comNone 1 = comXOnXoff 2 = comRTS 3 = comRTSXOnXOff '// Flow control is disabled (Default) '// Use XonXoff '// Use RTS/CTS '// Use both

Remarks

Under some Handshaking conditions MSComm32 can cause an application to hang, appear unresponsive or lose data. This is actually a low level comTimeOut problem in the Windows com driver of NT based operating systems, W2000, XP, Vista, Win7 etc. This problem does not occur with Comm32.