Any container application that can embed ActiveX controls can use SMTX. At design time, you can access your Modbus device from SMTX's test property page. This makes start-up and troubleshooting a snap, all without writing a single line of code! To further get you going quickly, SMTX also includes extensive online HTML help files with detailed examples for Excel, Visual Basic and Visual C . SMTX conforms to all of the Class 1 and Class 2 commands—plus a few additional ones—as specified in the Open Modbus/TCP Specification. A powerful set of properties and methods are provided for configuring SMTX and for talking to slave devices at run-time. Talking to a Modbus/TCP slave is as simple as calling a function with the necessary arguments. SMTX automatically builds the command, prepends the header, sends the command over the network, and receives and validates the response. Your program just reads and writes simple 16-bit data values. The example fragments below show just how easy it is to read the first ten holding registers from slave device 5.
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