Driver Configuration Screen
(Original Document)
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At a Glance
This chapter describes Modbus driver for serial port configuration.
The configuration tool is accessible from the Windows taskbar: Start → Control Panel → Drivers Manager. Choose the MODBUS SERIAL Driver tab and select one of the Configuration buttons corresponding to the four drivers.
Illustration
The configuration screen dedicated to the Modbus driver looks like this:
Configuration screen description:
Area
Element
Serial Port/Modem
If the Use Modem box is checked the list of all the modems configured on the PC is displayed in the Modem area (instead of COM Port). To configure the modem in Windows operating system refer to the page of configuration of the modem with Windows.
COM Port or Modem: Provides a choice for the communication port to be used, by default COM1 or the modem to be used.
Baud Rate: Provides a choice for transmission speed between 300 and 19200bits/second, by default 9600b/s.
Flow ctrl: Selects the flow control of the serial port (except for modem communication).
Stop Bits
Allows entry of the number of stop bits used for communication, by default 1 stop bit.
Parity
Is used to set whether a parity bit is added or not, as well as its type, such as:
  • Even, for even parity (default selection).
  • Odd, for odd parity.
  • None, for no parity bit.
Global TimeOut
Allows reception time-out to be defined (in milliseconds) while the driver is waiting for the response from the polled Modbus slave.
Inter-Char TimeOut
Allows quiet time to be defined (in milliseconds), permitting detection of a Modbus end delimiter.
If the Automatic box is checked, the value is automatically calculated according to speed (baud rate).
Mode (Data Bits)
RTU: The characters are coded on 8 bits in binary. This mode is the default mode.
ASCII: The characters are coded on 7 bits in ASCII.
Phone number
Number to dial when the communication port is connected to a modem.
Apply
Saves the configuration.
Undo
Cancels the latest modifications.
Default
Sets parameters for the different fields with default values.
OK
Allows configuration parameters to be acknowledged, and represents the window by an icon.
Modbus Instances
Once installed, configure the Modbus driver and reboot the computer. All Modbus instances that are activated in the driver manager are initialized.
For each Modbus instance configured a corresponding icon appears in the task bar.