WSMBT is a powerful and simple to use .Net control that makes it easy to access data from a Modbus slave device connected to the PC's Ethernet network. Simply drop the control on your form and talk to your device with your VB.NET, C# or Managed C++.
See the Quick Start Guide.

Download trial version
The trial version is a full featured version with a 30 min connection limit.

You may redistribute the wsmbt.dll assembly with your application program unlimited without any royalty.

Supported protocol variants:

• Modbus TCP/IP
• Modbus UDP/IP
• Modbus RTU Over TCP/IP
• Modbus ASCII Over TCP/IP

SUPPORTED MODBUS FUNCTIONS:

• 01: Read coil status
• 02: Read input status
• 03: Read holding registers
• 04: Read input registers
• 05: Force single coil
• 06: Preset single register
• 15: Force multiple coils
• 16: Preset multiple registers
• 17: Report Slave ID. (RTU/ASCII Over TCP/IP mode only)
• 22: Mask write register
• 23: Read/Write registers

User defined functions:

• Read User Defined Coils
• Read User Defined Registers
• Write User Defined Coils
• Write User Defined Registers

Examples:

C#
Int16[] Registers = new Int16[10];
WSMBT.Result Result;
Result = wsmbtControl1.ReadHoldingRegisters(1, 0, 10, Registers);

Visual Basic
Dim Registers(10) As Short
Dim Result As WSMBT.Result
Result = WsmbtControl1.ReadHoldingRegisters(1, 0, 10, Registers)

C++
array<Int16>^ Registers = gcnew array<Int16>(10);
WSMBT::Result Result;
Result = wsmbtControl1->ReadHoldingRegisters(1, 0, 10, Registers);