Added README for cli tool

AMWD.Protocols.Modbus.Common/Protocols/AsciiProtocol.cs

@@ -675,6 +675,10 @@ namespace AMWD.Protocols.Modbus.Common.Protocols
 		/// <summary>
 		/// Calculate LRC for Modbus ASCII.
 		/// </summary>
+		/// <remarks>
+		/// The LRC calculation algorithm is defined in the Modbus serial line specification.
+		/// See <see href="https://modbus.org/docs/Modbus_over_serial_line_V1_02.pdf">Modbus over Serial Line v1.02</see>, Appendix B, page 38.
+		/// </remarks>
 		/// <param name="message">The message chars.</param>
 		/// <param name="start">The start index.</param>
 		/// <param name="length">The number of bytes to calculate.</param>

AMWD.Protocols.Modbus.Common/Protocols/RtuProtocol.cs

@@ -733,6 +733,10 @@ namespace AMWD.Protocols.Modbus.Common.Protocols
 		/// <summary>
 		/// Calculate CRC16 for Modbus RTU.
 		/// </summary>
+		/// <remarks>
+		/// The CRC 16 calculation algorithm is defined in the Modbus serial line specification.
+		/// See <see href="https://modbus.org/docs/Modbus_over_serial_line_V1_02.pdf">Modbus over Serial Line v1.02</see>, Appendix B, page 40.
+		/// </remarks>
 		/// <param name="bytes">The message bytes.</param>
 		/// <param name="start">The start index.</param>
 		/// <param name="length">The number of bytes to calculate.</param>

CliClient/Program.cs

@@ -460,7 +460,7 @@ namespace AMWD.Protocols.Modbus.CliClient
 
 		private static void PrintHelp()
 		{
-			Console.WriteLine("Usage: amwd-modbus [OPTIONS] <serial-port>|<tcp-host>");
+			Console.WriteLine($"Usage: {typeof(Program).Assembly.GetName().Name} [OPTIONS] <serial-port>|<tcp-host>");
 			Console.WriteLine();
 			Console.WriteLine("Serial Port:");
 			Console.WriteLine("  COM1, COM2, ...                  on Windows");
@@ -522,7 +522,7 @@ namespace AMWD.Protocols.Modbus.CliClient
 			Console.WriteLine();
 			Console.WriteLine("Serial Options:");
 			Console.WriteLine("  -b, --baud #");
-			Console.WriteLine("    The baud rate (e.g. 9600, 19200, 38400, 115200). Default: 19200");
+			Console.WriteLine("    The baud rate (e.g. 9600). Default: 19200");
 			Console.WriteLine();
 			Console.WriteLine("  -d, --databits #");
 			Console.WriteLine("    The number of data bits (7/8 for ASCII, otherwise 8). Default: 8");

CliClient/README.md

@@ -0,0 +1,95 @@
+# Modbus CLI client
+
+This project contains a small CLI tool to test Modbus connections.
+
+```
+Usage: modbus-client [OPTIONS] <serial-port>|<tcp-host>
+
+Serial Port:
+  COM1, COM2, ...                  on Windows
+  /dev/ttyS0, /dev/ttyUSB0, ...    on Linux
+
+TCP Host:
+  192.168.x.y        as IPv4
+  fd00:1234:x:y::z   as IPv6
+
+General Options:
+  -h, --help
+    Shows this help message.
+
+  --debug
+    Waits for a debugger to attach before starting.
+
+  -m, --protocol <ascii|rtu|tcp>
+    Select which protocol to use.
+
+  -a, --address #
+    The slave/device address. 1-247 for serial, 0-255 for TCP. Default: 1
+
+  -r, --reference #
+    The start reference to read from. 0-65535. Default: 0
+
+  -c, --count #
+    The number of values to read. Default: 1
+
+  -t, --type <coil|discrete>
+    Reads a discrete value (bool): Coil or Discrete Input.
+
+  -t, --type input:<kind>
+    Reads an input register. Kind: (e.g. i32)
+      hex = print as HEX representation
+      i   =   signed integer (8, 16, 32, 64)
+      u   = unsigned integer (8, 16, 32, 64)
+      f   = floating point   (32, 64)
+
+  -t, --type holding:<kind>
+    Reads a holding register. Kind: (e.g. i32)
+      hex = print as HEX representation
+      i   =   signed integer (8, 16, 32, 64)
+      u   = unsigned integer (8, 16, 32, 64)
+      f   = floating point   (32, 64)
+
+  -t, --type id
+    Tries to read the device identification (Fn 43, Regular).
+    This option implies --once.
+
+  -i, --interval #
+    The polling interval in milliseconds. Default: 1000
+
+  -o, --timeout #
+    The timeout in milliseconds. Default: 1000
+
+  -1, --once
+    Just query once, no interval polling.
+
+
+Serial Options:
+  -b, --baud #
+    The baud rate (e.g. 9600). Default: 19200
+
+  -d, --databits #
+    The number of data bits (7/8 for ASCII, otherwise 8). Default: 8
+
+  -s, --stopbits #
+    The number of stop bits (1/2). Default: 1
+
+  -p, --parity <none|odd|even>
+    The kind of parity. Default: even
+
+  --enable-rs485
+    Enables the RS485 software switch for serial adapters capable of RS232 and RS485.
+
+
+TCP Options:
+  -p, --port #
+    The TCP port of the remote device. Default: 502
+```
+
+
+---
+
+Published under MIT License (see [choose a license])
+
+
+
+[choose a license]: https://choosealicense.com/licenses/mit/