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如何把DL/T 645-2007 协议切换到 ModBus协议请参考另一篇文章：
https://www.modbus.cn/10181.html
第一步：Open the serial port（以串口通讯 Modbus RTU为例）
正泰DDSU666 单相电能表Modbus通讯协议
| 参数地址 | 十进制对照表 | 参数代号 | 参数说明 | data type | 数据长度Word | 读写属性 |
| 0000H | / | UcodE | 编程密码 codE | int | 1 | R |
| 0001H | / | REV. | 软件版本 | int | 1 | R/W |
| 0002H | / | CLrE | 电能清零 CLr.E | int | 1 | R/W |
| 0003H | / | RESERVED | 保留 | int | 1 | R/W |
| 0004H | / | RESERVED | 保留 | int | 1 | R/W |
| 0005H | / | ChangeProtocol | 协议切换设置 | int | 1 | R/W |
| 0006H | / | Addr | 此地址只有 Modbus-RTU 时有效 | int | 1 | R/W |
| 0007H | / | RESERVED | 保留 | int | 1 | R/W |
| 0008H | / | RESERVED | 保留 | int | 1 | R/W |
| 0009H | / | RESERVED | 保留 | int | 1 | R/W |
| 000AH | / | RESERVED | 保留 | int | 1 | R/W |
| 000BH | / | RESERVED | 保留 | int | 1 | R/W |
| 000CH | / | BAud | Baud rate | int | 1 | R/W |
| 000DH | / | RESERVED | 保留 | int | 1 | R/W |
| 000EH | / | RESERVED | 保留 | int | 1 | R/W |
| 000FH | / | RESERVED | 保留 | int | 1 | R/W |
| 0010H | / | RESERVED | 保留 | int | 1 | R/W |
| 2000H | 8192 | U | A 相电压 | float | 2 | R/W |
| 2002H | 8194 | I | A 相电流 | float | 2 | R/W |
| 2004H | 8196 | P | 瞬时总有功功率 | float | 2 | R/W |
| 2006H | 8198 | Q | 瞬时总无功功率 | float | 2 | R/W |
| 2008H | 8200 | S | 瞬时总视在功率 | float | 2 | R/W |
| 200AH | 8202 | PF | 总功功率因数 | float | 2 | R/W |
| 200CH | / | RESERVED | 保留 | float | 2 | R/W |
| 200EH | 8206 | Freq | 电网频率 | float | 2 | R/W |
| 2010H | / | RESERVED | 保留 | float | 2 | R/W |
| 4000H | 16384 | Ep | 有功总电能 | float | 2 | R/W |
下面我们参照上图表格，填写一个“ 有功总电能 ”给大家做演示
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