using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;


namespace ConsoleApplication1
{
  class Program
  {

    static void Main(string[] args)
    {
      string errmsg = "";

      if (YAPI.RegisterHub("usb", ref errmsg) != YAPI.SUCCESS) {
        Console.WriteLine("RegisterHub error: " + errmsg);
        Environment.Exit(1);
      }


      YSerialPort serialPort;
      if (args.Length > 0) {
        serialPort = YSerialPort.FindSerialPort(args[0]);
      } else {
        serialPort = YSerialPort.FirstSerialPort();
        if (serialPort == null) {
          Console.WriteLine("No module connected (check USB cable)");
          Environment.Exit(1);
        }
      }
      int slave, reg, val;
      String cmd;
      do {
        Console.WriteLine("Please enter the MODBUS slave address (1...255)");
        Console.Write("Slave: ");
        slave = Convert.ToInt32(Console.ReadLine());
      } while (slave < 1 || slave > 255);
      do {
        Console.WriteLine("Please select a Coil No (>=1), Input Bit No (>=10001),");
        Console.WriteLine("Input Register No (>=30001) or Holding Register No (>=40001)");
        Console.Write("No: ");
        reg = Convert.ToInt32(Console.ReadLine());
      } while (reg < 1 || reg >= 50000 || (reg % 10000) == 0);
      while (true) {
        if (reg >= 40001) {
          val = serialPort.modbusReadRegisters(slave, reg - 40001, 1)[0];
        } else if (reg >= 30001) {
          val = serialPort.modbusReadInputRegisters(slave, reg - 30001, 1)[0];
        } else if (reg >= 10001) {
          val = serialPort.modbusReadInputBits(slave, reg - 10001, 1)[0];
        } else {
          val = serialPort.modbusReadBits(slave, reg - 1, 1)[0];
        }
        Console.WriteLine("Current value: " + val.ToString());
        Console.Write("Press ENTER to read again, Q to quit");
        if ((reg % 40000) < 10000) {
          Console.Write(" or enter a new value");
        }
        Console.Write(": ");
        cmd = Console.ReadLine();
        if (cmd == "q" || cmd == "Q") break;
        if (cmd != "" && (reg % 40000) < 10000) {
          val = Convert.ToInt32(cmd);
          if (reg >= 40001) {
            serialPort.modbusWriteRegister(slave, reg - 40001, val);
          } else {
            serialPort.modbusWriteBit(slave, reg - 1, val);
          }
        }
      }
      YAPI.FreeAPI();
    }
  }
}
