Generic Comm Interface
The second option available from the Configure
The DDE Server’s Generic Communications Interface enables you to communicate with any active device for testing and diagnostics purposes.
The Generic Communications screen is divided into three sections. The Modbus CRC section provides a utility for calculating the CRC on a byte string. Enter a string of hex characters, then choose the Compute CRC button. The CRC is calculated and displayed under the Byte String. You can use this feature to prepare raw Modbus messages.
The Send and Receive portions of the window enable you to transmit and receive messages to and from a selected port.
To use the Generic Communications feature:
1.Use the Modbus CRC fields to calculate the CRC on your character string.
2.Enter your character string followed by the CRC in the Byte String field, as shown in the example above.
3.Select a port to transmit on, and a port to receive on in the TX Port and RX Port fields. (NOTE: these may be the same port.)
4.If necessary, verify the port properties for both the Transmit and Receive ports are set correctly by clicking on the TX Port Settings and RX Port Settings buttons. A sample ComPort Settings dialog is shown below:
50 • Chapter Four - Menus and Toolbars | DDE Server User’s Guide |