54 lines
1.2 KiB
Markdown
54 lines
1.2 KiB
Markdown
# Modbus Protocol for .NET | Serial
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The Modbus Serial protocol implementation.
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## Example
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A simple example which reads the voltage between L1 and N of a Janitza device.
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```csharp
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string serialPort = "COM5";
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using var client = new ModbusSerialClient(serialPort);
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await client.ConnectAsync(CancellationToken.None);
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byte unitId = 5;
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ushort startAddress = 19000;
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ushort count = 2;
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var registers = await client.ReadHoldingRegistersAsync(unitId, startAddress, count);
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float voltage = registers.GetSingle();
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Console.WriteLine($"The voltage of device #{unitId} between L1 and N is: {voltage:N2}V");
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```
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If you want to use the `ASCII` protocol instead, you can do this on initialization:
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```csharp
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// [...]
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using var client = new ModbusSerialClient(serialPort)
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{
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Protocol = new AsciiProtocol();
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};
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// [...]
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```
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## Sources
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- Protocol Specification: [v1.1b3]
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- Modbus Serial line: [v1.02]
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---
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Published under MIT License (see [choose a license])
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[v1.1b3]: https://modbus.org/docs/Modbus_Application_Protocol_V1_1b3.pdf
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[v1.02]: https://modbus.org/docs/Modbus_over_serial_line_V1_02.pdf
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[choose a license]: https://choosealicense.com/licenses/mit/
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