package com.ld.igds.protocol.es.dlt645.builder;

import com.ld.igds.protocol.es.dlt645.util.Dlt645Utils;

/**
 * 电表命令生成
 *
 * @author czt
 */
public class CommandBuild {

    private final static CommandBuild instance = new CommandBuild();

    private CommandBuild() {
    }

    public static CommandBuild getInstance() {
        return instance;
    }

    /**
     * 能耗采集命令
     *
     * @param esAddr 电表地址
     * @return
     */
    public static String getMsgCheck(String esAddr) {

        //获取命令
        StringBuffer sb = new StringBuffer();

        //帧起始符
        sb.append("68");
        //地域域，反向拼接
        sb.append(Dlt645Utils.addrToString(esAddr));
        //帧起始符
        sb.append("68");
        //控制码及
        sb.append("11");
        //数据域长度
        sb.append("04");
        //数据域
        sb.append("33333433");
        //校验码
        String checkNum = Dlt645Utils.makeCheck(sb.toString());
        sb.append(checkNum);

        StringBuffer sb0 = new StringBuffer();
        //起始符
        sb0.append(Dlt645Utils.MSG_START);
        sb0.append(sb);
        //结尾符
        sb0.append(Dlt645Utils.MSG_END);

        return sb0.toString();
    }
}