Part	Description
object	An object expression that evaluates to a PortController object.
port	A string containing the name of the communications port.
settings	A string containing comma delimited settings for the port in the format BaudRate, DataBits, Parity, StopBits.

Example

myPortController.Open "COM1", "9600,8,N,1"

m_myPortController.Open("COM1","9600,8,N,1");

myPortController.Open('COM1', '9600,8,N,1');

Remarks

The settings parameter is optional. If is not supplied (or specified as an empty string in VC++) the current values for these properties are used.
To use current values for a particular setting, simply leave the setting blank. For example, "9600, , E, 1.5" sets BaudRate to 9600, Parity to Even, and StopBits to 1.5 while using the current value for DataBits.
Valid baud rates are as follows:
- 110
- 300
- 600
- 1200
- 2400
- 4800
- 9600 (Default)
- 14400
- 19200
- 28800
- 38400
- 56000
- 57600
- 115200
- 128000
- 256000
Valid data bits values are as follows:
- 8 (Default)
- 7
- 6
- 5
Valid parity values are as follows:

Setting Description

N None

O Odd

E Even

M Mark

S Space
Note that these conventions are different than the conventions for the Parity property conventions.

BaudRate, DataBits, Parity, and StopBits parameters are subject to the constraints documented in their property documentation.

Nothing

Violating any of the settings constraints will cause the PortController to use the current or default values for the offending setting.
After opening a port using Open(), any subsequent call to Open() will cause the PortController to throw a "Port is already open" exception.
An attempt to open a port that has already been opened by another application or that does not exist will cause the PortController to throw a "Could not open port. This may be because the port does not exist or it is already in use." exception.