Although the OnComm event is generated whenever a communication error or event occurs, the CommEvent property holds the numeric code for that error or event. This property is not available at design time and is read-only at run mevent The CommEvent property syntax has these parts: An expression that evaluates to an in the Applies To list. Boolean 3Ĥ CommEvent Property Returns the most recent communication event or error. For more information on handshaking protocols, see the Handshaking property. The CTSHolding property gives you a way to manually poll the Clear To Send line if you need to determine its state. The Clear To Send line is used in RTS/CTS (Request To Send/Clear To Send) hardware handshaking.
The following table lists the CTSHolding property settings for the MSComm control. This property is not available at design time and is read-only at run time.ctsholding The CTSHolding property syntax has these parts: An expression that evaluates to an in the Applies To list. Typically, the Clear To Send signal is sent from a modem to the attached computer to indicate that transmission can proceed. Boolean CTSHolding Property Determines whether you can send data by querying the state of the Clear To Send (CTS) line. The Carrier Detect is also known as the Receive Line Signal Detect (RLSD). Settings The settings for the CDHolding property are: Setting True Carrier Detect line is high False Carrier Detect line is low Note It is especially important to trap a loss of the carrier in a host application, such as a bulletin board, because the caller can hang up (drop the carrier) at any time. This property is not available at design time and is read-only at run time.cdholding The CDHolding property syntax has these parts: An expression that evaluates to an in the Applies To list. Carrier Detect is a signal sent from a modem to the attached computer to indicate that the modem is online. MSComm1.Break = False 2ģ CDHolding Property Determines whether the carrier is present by querying the state of the Carrier Detect (CD) line. Do Until Timer > Duration! Dummy = DoEvents() Loop ' Clear the Break condition. Duration! = Timer +.1 ' Wait for the duration to pass. MSComm1.Break = True ' Set duration to 1/10 second.
#EXCEL VBA SERIAL PORT MSCOMM CONTROL HOW TO#
Boolean Break Property Example The following example shows how to send a break signal for a tenth of a second: ' Set the Break condition. Typically, you set the break state for a short interval of time, and only if the device with which you are communicating requires that a break signal be set. The break signal suspends character transmission and places the transmission line in a break state until you set the Break property to False. When set to True, the Break property sends a break signal.
Settings The settings for are: Setting True Sets the break signal state. A Boolean expression specifying whether the break signal state is set, as described in Settings. This property is not available at design time.break The Break property syntax has these parts: An expression that evaluates to an in the Applies To list. Taghizadeh Break Property CDHolding Property CTSHolding Property CommEvent Property CommID Property CommPort Property DSRHolding Property DTREnable Property EOFEnable Property Handshaking Property InBufferCount Property InBufferSize Property Index Property (ActiveX Controls) Input Property InputLen Property InputMode Property Name Property NullDiscard Property, MSComm Control Object Property (ActiveX Controls) OutBufferCount Property OutBufferSize Property Output Property Parent Property ParityReplace Property PortOpen Property RTSEnable Property RThreshold Property SThreshold Property Settings Property Tag Property (ActiveX Controls 1Ģ Break Property Sets or clears the break signal state.
0 kommentar(er)
