iso8583 常用域说明（仅供参考）

                <field no="2"  packet_size="19" format="BV2_STR">主账号</field>
        <field no="3"  packet_size="6"  format="BCD_ASC">处理代码</field>
        <field no="4"  packet_size="12" format="BCD_SNZ">金额</field>
        <field no="11" packet_size="6"  format="BCD_ASC">流水号</field>
        <field no="12" packet_size="6"  format="BCD_ASC">交易时间</field>
        <field no="13" packet_size="4"  format="BCD_ASC">交易日期</field>
        <field no="14" packet_size="4"  format="BCD_ASC">卡有效期</field>
        <field no="22" packet_size="3"  format="BCD_ASC">pos输入方式</field>
        <field no="23" packet_size="3"  format="BCD_ASC">卡片序列号</field>
        <field no="25" packet_size="2"  format="BCD_ASC">服务点条件码</field>
        <field no="28" packet_size="1"  format="BCD_ASC">后续标准</field>
        <field no="35" packet_size="37" format="BV2_STR">二磁道内容</field>
        <field no="36" packet_size="104" format="BV3_STR">三磁道内容</field>
        <field no="37" packet_size="12" format="ASC_STR">系统参考号</field>
        <field no="38" packet_size="6"  format="ASC_STR">授权码</field>
        <field no="39" packet_size="2"  format="ASC_ASC">返回码</field>
        <field no="41" packet_size="8"  format="ASC_STR">终端号</field>
        <field no="42" packet_size="15" format="ASC_STR">商户号</field>
        <field no="44" packet_size="16" format="IV2_BIT">附加响应（更新密钥）</field>
        <field no="49" packet_size="3"  format="ASC_STR">交易货币代码</field>
        <field no="52" packet_size="64" format="BIT_BIT">个人密码密文</field>
        <field no="53" packet_size="16" format="BCD_ASC">安全控制信息</field>
        <field no="54" packet_size="26" format="AV3_STR">卡余额/附加余额</field>
        <field no="60" packet_size="999" format="BV3_STR">操作员号密码</field>
        <field no="61" packet_size="18" format="AV3_STR">持卡人证件号码</field>
        <field no="62" packet_size="18" format="AV3_STR">票据号/批次号（6位批次号6位票据号）</field>
        <field no="63" packet_size="156" format="AV3_STR">结算信息（分类结算结果（对账不平时返回））</field>
        <field no="64" packet_size="64" format="BIT_BIT">MAC</field>