Using the Communications Control The Communications control allows you to add both simple serial port communication functionality to your application and advanced functionality to create a full-featured, event-driven communications tool. The Communications Control The Communications control provides an interface to a standard set of communications commands. It allows you to establish a connection to a serial port, connect to another communication device (a modem, for instance), issue commands, exchange data, and monitor and respond to various events and errors that may be encountered during a serial connection.

Possible Uses • To dial a phone number. • To monitor a serial port for incoming data. • To create a full-featured terminal program. Sample Applications: Dialer.vbp and VBTerm.vbp The Dialer.vbp and VBTerm.vbp sample applications which are listed in the directory, demonstrate simple and complex (respectively) programming techniques of the Communications control.

This is very urgent! I am developing an application which is pretty much a replacement of a hyperterminal. I am trying to send commands to the serial port using MSComm in VB6.0 When I type in on the hyperterminal h003128 I get a response OK. Or when I type in i003 it displays back. Visual Basic: MSComm. Setting the PortOpen property to True opens the port. The MSComm control automatically closes the serial port when your application is.

Basics of Serial Communications Every computer comes with one or more serial ports. They are named successively: COM1, COM2, and so on. Hp Wireless Keyboard Kg-0981 Manual: Software Free Download. On a standard PC, the mouse is usually connected to the COM1 port. A modem may be connected to COM2, a scanner to COM3, etc. Serial ports provide a channel for the transmission of data from these external serial devices. The essential function of the serial port is to act as an interpreter between the CPU and the serial device.

As data is sent through the serial port from the CPU, Byte values are converted to serial bits. When data is received, serial bits are converted to Byte values. A further layer of interpretation is needed to complete the transmission of data. On the operating system side, Windows uses a communications driver, Comm.drv, to send and receive data using standard Windows API functions. The serial device manufacturer provides a driver that connects its hardware to Windows. When you use the Communications control, you are issuing API functions, which are then interpreted by Comm.drv and passed to the device driver. As a programmer, you need only concern yourself with the Windows side of this interaction.

As a Visual Basic programmer, you need only concern yourself with the interface that the Communications control provides to API functions of the Windows communications driver. In other words, you set and monitor properties and events of the Communications control. Establishing the Serial Connection The first step in using the Communications control is establishing the connection to the serial port. The following table lists the properties that are used to establish the serial connection: Properties Description CommPort Sets and returns the communications port number. Download Realtek High Definition Audio Driver For Win Xp Sp3. Settings Sets and returns the baud rate, parity, data bits, and stop bits as a string.

PortOpen Sets and returns the state of a communications port. Also opens and closes a port.

Opening the Serial Port To open a serial port, use the CommPort, PortOpen, and Settings properties. For example: ' Open the serial port MSComm1.CommPort = 2 MSComm1.Settings = '9600,N,8,1' MSComm1.PortOpen = True The CommPort property sets which serial port to open. Assuming that a modem is connected to COM2, the above example sets the value to 2 (COM2) and connects to the modem. You can set the CommPort property value to any number between 1 and 16 (the default is 1). If, however, you set this value to a COM port that does not exist for the system on which your application is run, an error will be generated. The Settings property allows you to specify the baud rate, parity, and the number of data bits and stop bits.