B&B Electronics MODSCAN32 - Manual User Manual
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Port Control Description
The Modbus Port Configuration Control, (Serial), is used to programatically control the operating
characteristics of a local PC Com port connected to one or more MODBUS slave devices. Use of the Serial
control within a user application is optional. The hardware parameters configured by this control may also
be set by accessing menu items within the modbuss ocx helper application, mbOCXsvr.exe. Once
configured, these parameters will remain in place and be used to initialize the designated COM port each
time a control within modbuss.ocx is started.
Properties
The Serial control exposes the following properties and methods:
Port
The PC COM port identification. (If set to 0, indicates that the connection is to be
made via the first TAPI line device.)
Protocol
MODBUS Transmission Mode (0=RTU, 1=ASCII).
TimeOut
Defines the timeout associated with the protocol for this control. Specified in
milliseconds, this is the amount of time the MODBUS driver waits for a slave
device to respond after polling for data.
BaudRate
Serial Baud Rate setting.
(0=300, 1=600, 2=1200, 3=2400, 4=4800, 5=9600, 6=14400,7=19200)
Parity
Odd, Even or No Parity, (0, 1, or 2).
StopBits
Number of Stop Bits, (0=1, 1=1.5, 2=2).
RTSHandshaking
Enable hardware output flow control using RTS/CTS. The control will ALWAYS
enable RTS prior to transmitting. This property blocks transmission until a CTS is
received from the connected slave.
DTRHandshaking
Enable hardware output flow control using DTR/DSR handshaking.
RTSDelay1
Delay in milliseconds between activation of RTS and transmission of the first
character.
RTSDelay2
Delay in milliseconds after transmitting last character before releasing RTS signal.
PhoneNo
Phone number to dial during Initialize(). Used only for TAPI connections.
Methods
Initialize()
Method which instructs the control to configure the defined port. This method
needs to be controlled programatically if the characteristics of the serial
communications channel change during execution of the application. The use of
the Modbus Port Configuration Control is optional within a program, as the
associated setup parameters may be changed via menu options within
mbOCXsvr and remain valid between executions.
HangupCall()
Method used to disconnect a call.
Events