Unity3D class for work with Smartec ST-CE010EM (Em Marine) http://www.smartec-security.ru/news/usb-card-reader.htm

RFIDController.cs

using UnityEngine;

public class RFIDController : MonoBehaviour
{
    public delegate void RFIDEvent(string code);
    public delegate void RFIDErrorEvent(string message);
    public event RFIDEvent OnRFID;
    public event RFIDErrorEvent OnRFIDError;

    private string _tempRfidCode = "";
    private string _rfidCode = "";

    void Update()
    {
        if (Input.GetKeyDown(KeyCode.Alpha0)) _tempRfidCode += "0";
        if (Input.GetKeyDown(KeyCode.Alpha1)) _tempRfidCode += "1";
        if (Input.GetKeyDown(KeyCode.Alpha2)) _tempRfidCode += "2";
        if (Input.GetKeyDown(KeyCode.Alpha3)) _tempRfidCode += "3";
        if (Input.GetKeyDown(KeyCode.Alpha4)) _tempRfidCode += "4";
        if (Input.GetKeyDown(KeyCode.Alpha5)) _tempRfidCode += "5";
        if (Input.GetKeyDown(KeyCode.Alpha6)) _tempRfidCode += "6";
        if (Input.GetKeyDown(KeyCode.Alpha7)) _tempRfidCode += "7";
        if (Input.GetKeyDown(KeyCode.Alpha8)) _tempRfidCode += "8";
        if (Input.GetKeyDown(KeyCode.Alpha9)) _tempRfidCode += "9";
        if (Input.GetKeyDown(KeyCode.Return))
        {
            if (_tempRfidCode.Length == 10)
            {
                _rfidCode = _tempRfidCode;
                Debug.Log("RFID: " + _rfidCode);
                if (OnRFID != null) OnRFID(_rfidCode);
            }
            else
            {
                Debug.LogError("Wrong RFID: " + _tempRfidCode);
                if (OnRFIDError != null) OnRFIDError("Wrong RFID: " + _tempRfidCode);
            }
            _tempRfidCode = "";
        }
    }
}