am-wd/AMWD.Protocols.Modbus
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Implementing ASCII protocol; removing min. unit ID for serial line - see note on README

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This commit is contained in:
Andreas Müller
2024-03-28 18:08:44 +01:00
parent dee0d67453
commit 1bcac96d52
7 changed files with 1949 additions and 192 deletions
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68
AMWD.Protocols.Modbus.Common/Protocols/TcpProtocol.cs
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@@ -91,9 +91,12 @@ namespace AMWD.Protocols.Modbus.Common.Protocols
byte[] request = new byte[12];
byte[] header = GetHeader(unitId, 6);
byte[] header = GetHeader(6);
Array.Copy(header, 0, request, 0, header.Length);
// Unit id
request[6] = unitId;
// Function code
request[7] = (byte)ModbusFunctionCode.ReadCoils;
@@ -146,9 +149,12 @@ namespace AMWD.Protocols.Modbus.Common.Protocols
byte[] request = new byte[12];
byte[] header = GetHeader(unitId, 6);
byte[] header = GetHeader(6);
Array.Copy(header, 0, request, 0, header.Length);
// Unit id
request[6] = unitId;
// Function code
request[7] = (byte)ModbusFunctionCode.ReadDiscreteInputs;
@@ -201,9 +207,12 @@ namespace AMWD.Protocols.Modbus.Common.Protocols
byte[] request = new byte[12];
byte[] header = GetHeader(unitId, 6);
byte[] header = GetHeader(6);
Array.Copy(header, 0, request, 0, header.Length);
// Unit id
request[6] = unitId;
// Function code
request[7] = (byte)ModbusFunctionCode.ReadHoldingRegisters;
@@ -253,9 +262,12 @@ namespace AMWD.Protocols.Modbus.Common.Protocols
byte[] request = new byte[12];
byte[] header = GetHeader(unitId, 6);
byte[] header = GetHeader(6);
Array.Copy(header, 0, request, 0, header.Length);
// Unit id
request[6] = unitId;
// Function code
request[7] = (byte)ModbusFunctionCode.ReadInputRegisters;
@@ -302,9 +314,12 @@ namespace AMWD.Protocols.Modbus.Common.Protocols
byte[] request = new byte[11];
byte[] header = GetHeader(unitId, 5);
byte[] header = GetHeader(5);
Array.Copy(header, 0, request, 0, header.Length);
// Unit id
request[6] = unitId;
// Function code
request[7] = (byte)ModbusFunctionCode.EncapsulatedInterface;
@@ -365,9 +380,12 @@ namespace AMWD.Protocols.Modbus.Common.Protocols
byte[] request = new byte[12];
byte[] header = GetHeader(unitId, 6);
byte[] header = GetHeader(6);
Array.Copy(header, 0, request, 0, header.Length);
// Unit id
request[6] = unitId;
// Function code
request[7] = (byte)ModbusFunctionCode.WriteSingleCoil;
@@ -404,9 +422,12 @@ namespace AMWD.Protocols.Modbus.Common.Protocols
byte[] request = new byte[12];
byte[] header = GetHeader(unitId, 6);
byte[] header = GetHeader(6);
Array.Copy(header, 0, request, 0, header.Length);
// Unit id
request[6] = unitId;
// Function code
request[7] = (byte)ModbusFunctionCode.WriteSingleRegister;
@@ -458,21 +479,29 @@ namespace AMWD.Protocols.Modbus.Common.Protocols
byte byteCount = (byte)Math.Ceiling(orderedList.Count / 8.0);
byte[] request = new byte[13 + byteCount];
byte[] header = GetHeader(unitId, byteCount + 7);
byte[] header = GetHeader(byteCount + 7);
Array.Copy(header, 0, request, 0, header.Length);
// Unit id
request[6] = unitId;
// Function code
request[7] = (byte)ModbusFunctionCode.WriteMultipleCoils;
// Starting address
byte[] addrBytes = firstAddress.ToBigEndianBytes();
request[8] = addrBytes[0];
request[9] = addrBytes[1];
// Quantity
byte[] countBytes = ((ushort)orderedList.Count).ToBigEndianBytes();
request[10] = countBytes[0];
request[11] = countBytes[1];
// Byte count
request[12] = byteCount;
// Coils
int baseOffset = 13;
for (int i = 0; i < orderedList.Count; i++)
{
@@ -525,21 +554,29 @@ namespace AMWD.Protocols.Modbus.Common.Protocols
byte byteCount = (byte)(orderedList.Count * 2);
byte[] request = new byte[13 + byteCount];
byte[] header = GetHeader(unitId, byteCount + 7);
byte[] header = GetHeader(byteCount + 7);
Array.Copy(header, 0, request, 0, header.Length);
// Unit id
request[6] = unitId;
// Function code
request[7] = (byte)ModbusFunctionCode.WriteMultipleRegisters;
// Starting address
byte[] addrBytes = firstAddress.ToBigEndianBytes();
request[8] = addrBytes[0];
request[9] = addrBytes[1];
// Quantity
byte[] countBytes = ((ushort)orderedList.Count).ToBigEndianBytes();
request[10] = countBytes[0];
request[11] = countBytes[1];
// Byte count
request[12] = byteCount;
// Registers
int baseOffset = 13;
for (int i = 0; i < orderedList.Count; i++)
{
@@ -633,15 +670,11 @@ namespace AMWD.Protocols.Modbus.Common.Protocols
/// <summary>
/// Generates the header for a Modbus request.
/// </summary>
/// <param name="unitId">The unit identifier.</param>
/// <param name="followingBytes">The number of following bytes.</param>
/// <returns>The header ready to copy to the request bytes.</returns>
/// <remarks>
/// <strong>ATTENTION:</strong> Do not forget the <paramref name="unitId"/>. It is placed after the count information.
/// </remarks>
private byte[] GetHeader(byte unitId, int followingBytes)
/// <returns>The header ready to copy to the request bytes (6 bytes).</returns>
private byte[] GetHeader(int followingBytes)
{
byte[] header = new byte[7];
byte[] header = new byte[6];
// Transaction id
ushort txId = GetNextTransacitonId();
@@ -658,9 +691,6 @@ namespace AMWD.Protocols.Modbus.Common.Protocols
header[4] = countBytes[0];
header[5] = countBytes[1];
// Unit identifier
header[6] = unitId;
return header;
}