VISUAL BASIC SAMPLE PROJECTS SERIAL
VISUAL BASIC SAMPLE PROJECTS CODE
VISUAL BASIC SAMPLE PROJECTS PC

Public Static Sub DataShow(TextShow As Control, Data As String) Sub txtRXTX_KeyPress(KeyAscii As Integer)ДЇirst time i did programming receive data with Property Input if we get direct data from this ,we will get refuse data ,so we may be using a filter function name is DataShow as write thus as below If we want print data to port while we are typing data to keyborad ,we use event the KeyPress of Control TextBox

VISUAL BASIC SAMPLE PROJECTS SERIAL

Input =receive data from port but this will being command to write at Event Property OnComm that has in Sub MSComm_OnComm that read data from serial port or RS-232 We can using the MSComm properties allow the setting of communication parameters including port selection and port enabling functions.ДЇrom detail above, we will programming in VB procedure at Sub Form_Load() or create new Sub in case call in the futureДЇrom progrmming above is define start value to comm port and open port to communicate with RS-232 So, we can get data and send data with Property Output and Input Property Rthresholdmean is do activate occur with Event-driven when has data in receive buffer (comm port) that active the CommEvent in procedure OnComm Event Property PortOpen mean is open port to communucate Open =True ,Close =FalseДҐ. MSComm1.Settings='Baud(rate for receive/send data),Parity(N,Number of bits,bits Stop'ДЈ.Property InputLenmean is define input buffer size when data incomingД¤. Property Settings mean is setting value for receive /send data that will know baud rate of device which connect ,how much thus as detail below

VISUAL BASIC SAMPLE PROJECTS CODE

Property CommPort Select comm port that we are using it thus as source code belowДў. DTSEnablemean is define signal DTR(Data Terminal Ready)Дefine MSComm Control properties to connect portДЎ. RTSEnablemean is define signal RTS (Request To Send) NullDiscard mean is define in receive or not 'NULL CHARACTER' Mean is character value instead of occur Parity Error Inputlen mean is number of data to read in a buffer receive data Sthreshold mean is define to occur in Event-driven for receive data Rthreshold mean is define to occur in Event-driven for send data OutBuffersize mean is define buffer for send data. InBuffersize mean is define buffer for receive data. HandShaking mean is we can define to 4 type 1.comNone 2.comXonXoff 3. Setting mean is Baud,Parity,Data(number of bits),Stop Ex. ComPort mean is Port interfacing RS-232 (Com1,Com2) ДЇor programming in Serail Port communication normally using comm event are comEvReceive,comEvSend if it is communication in MODEM then using many one in check signal ,please refer help or MSDN. MSComm control has Event which use one only in Oncomm Event that communication is interrupt. The polling will be through checking signal from device such as keyboard polling as user press button.ДЇor CPU polling to check signal,we call ' Wet Poll' that will be loss time 90%, We can avoid the cycle time lose with using polling technique that call is 'Round Robin'ДЄbout in VB programming ,we use Timer control for checking data from Serial port.

VISUAL BASIC SAMPLE PROJECTS PC

In PC system ,the polling has some transfering between terminal and CPU in case data is byte type that keyborad send coming. We are programming in CommEvent and OnCommEvent that these event will be active when coming signal from device. Interrupt process is check device signal if the devices has already in sending code to comm port of computer. Programming for interfacing Serial Port has two method. Step three drag MS Comm control from Toolbox to paste on Form thus as picture below. Step two Select Control name is 'Microsoft Comm Control 6' thus picture below.ДЈ. Step one Select at top menu bar of Visuabasic thus as picture below MSComm is a custom control shipped with VB5.0 and VB6.0 and must be loaded using the Tools menu.ДЇollow to select in check box name is MSComm after it will display a telephone icon on control box dialog that drag and drop it to your form of Project To communicate with the serial port using Visual Basic, the MsComm control must be utilized to allow serial data transfer via a serial port ( Com1-Com4). PC's serial data acquisition interfaces require the sending and receiving of ASCII data to operate. The teaching method used is to show a basic example of a VB6.0 program which communicates with an modem or PC to PC together by sending and receiving ASCII data, and then disect the program to understand its operation. This programming guide assumes the user has a basic knowlege of Visual Basic programming. We will used VB control 'MSComm' that you should be referrent the control by Custom control. Visual Basic programming access I/O Serial Port Visual Basic(VB) Programming in RS-232,Serial Port,Com Port Interfacing for HardwareS systems.

Visual basic sample projects