About PortController
Introduction
Purchasing PortController
Redistributing PortController
License Agreement
Support
Getting Started
How to Use PortController
PortController Sample Projects
Handling PortController Errors
Reference
Properties
AvailableSystemPorts
BaudRate Property
Break Property
BytesUsedRQ Property
BytesUsedTQ Property
Cd Property
Cts Property
DataBits Property
Dsr Property
Dtr Property
DtrDsr Property
EnableReadOnEventChar Property
EventChar Property
ForceBeginInvokeEventFiring Property
IsOpen Property
IsFileTransferInProgress Property
Parity Property
PortHandle Property
PortName Property
ReceiveBufferSize Property
Ring Property
Rts Property
RtsCts Property
StopBits Property
SystemPorts Property
TraceOutput Property
TransmitBufferSize
XoffByte Property
XonByte Property
XonXoff Property
Methods
CancelFileTransfer Method
ClearRQ Method
ClearTQ Method
Close Method
GetErrorStatus Method
Open Method
Read Method
ReadBinary Method
ReceiveFileXModem Method
ReceiveFileXModemCRC Method
ReceiveFileYModem Method
ReceiveFileZModem Method
SendFileXModem Method
SendFileXModem1k Method
SendFileYModem Method
SendFileZModem Method
SimulateReceivedXoff Method
SimulateReceivedXon Method
Write Method
WriteBinary Method
Events
OnBreakSignal Event
OnCdToggle Event
OnCtsToggle Event
OnDataReceived Event
OnDsrToggle Event
OnError Event
OnEventCharReceived Event
OnFileTransferComplete Event
OnFileTransferStatusUpdate Event
OnRing Event
OnTQEmpty Event

DtrDsr Property

Enables/Disables DTR/DSR hardware handshaking.

Syntax

[Visual Basic]
object.DtrDsr [ = value ]

[C#]
object.DtrDsr [ = value ]

[C++]
object->DtrDsr [ = value ]

Parameters

object

An object expression that evaluates to a PortController object.

value

A boolean value representing the state of DTR/DSR handshaking.

Return Value

The boolean value true if DTR/DSR handshaking is on, false otherwise.

Default

False

Remarks

When DTR/DSR handshaking is enabled the DTR line fluctuates between on and off. Reading the Dtr property returns the current value of the fluctuating DTR line.

Errors

None

Example

[Visual Basic]
'Set DTR/DSR
myPortController.DtrDsr = True

'Get DTR/DSR
Dim dtrdsr As Boolean
dtrdsr = myPortController.DtrDsr


[C#]
// Set DTR/DSR
myPortController.DtrDsr = true;

// Get DTR/DSR
Boolean bDtrDsr = myPortController.DtrDsr;


[C++]
// Set DTR/DSR
myPortController->DtrDsr = true;

// Get DTR/DSR
Boolean bDtrDsr = myPortController->DtrDsr;

See Also

RtsCts property | XonXoff property