PortOpen Property Sets and returns the state of the communications port (open or closed). Not available at design time. Syntax object. PortOpen [ = value ] The PortOpen property syntax has these parts: Part Description object An object expression that evaluates to an object in the Applies To list. Value A specifying the state of the communications port. Settings The settings for value are: Setting Description True Port is opened False Port is closed Remarks Setting the PortOpen property to True opens the port.

Jan 05, 2014 You cannot 'convert' VB6 serial port code to.Net - it needs to be rewritten with a new logical structure. The differences between the two serial port. Jun 19, 2008 The most frequently used properties to send data to the serial port using the mscomm control are as follows: CommPort The CommPort property specifies the.

Setting it to False closes the port and clears the receive and transmit buffers. The MSComm control automatically closes the serial port when your application is terminated. Make sure the CommPort property is set to a valid port number before opening the port. If the CommPort property is set to an invalid port number when you try to open the port, the MSComm control generates error 68 (Device unavailable).

In addition, your serial port device must support the current values in the Settings property. If the Settings property contains communications settings that your hardware does not support, your hardware may not work correctly. If either the DTREnable or the RTSEnable properties is set to True before the port is opened, the properties are set to False when the port is closed. Otherwise, the DTR and RTS lines remain in their previous state. Data Type Boolean.

Mscomm Control and Visual BASIC Phone:(705) 671-2652 Fax:(705) 671-6127 Email: Sending Commands in VISUAL BASIC to ADR ( RS232 ) interfaces using mscomm IMPORTANT: For a tutorial on VB2008 or VB2010 ( VB.NET ) including Express, See: The MSComm Control NOTE1: This programming guide assumes the user has a basic knowlege of Visual Basic programming. The teaching method used is to show a basic example of a VB4.0 program which communicates with an ADR board by sending and receiving ASCII data, and then disect the program to understand its operation. NOTE2: The procedure shown is identical for VB Ver 4 and VB Ver. ADR serial data acquisition interfaces require the sending and receiving of ASCII data via RS232 to operate. To communicate with the ADR boards using Visual Basic, the MsComm control must be utilized to allow serial data transfer via a serial port ( Com1-Com4).

MSComm is a custom control shipped with VB4.0 and VB5. Drivers Hasee Notebook. 0 and must be loaded using the Tools menu. Form1 of a sample program controlling an is shown below. The program was built using radio buttons for port control, three command buttons, a text box to display analog data and the MSComm control for serial communications. When run, the port is enabled using the radio buttons and then AN0 is read every time the 'Read AN0' button is clicked. The analog data is then displayed in text box 1.