Black Box GEH-6510 - Manual (Page 53)

50 •••• Chapter Four - Menus and Toolbars DDE Server User’s Guide
Generic Comm Interface
The second option available from the Configure pull-down menu is the Generic
Comm Interface. Select this option to open the Generic Communications
Interface window, shown below.
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: