For instructions on how to switch from the DL/T 645-2007 protocol to the ModBus protocol, please refer to another article:
https://www.modbus.cn/10181.html
Step 1: Open the serial port (taking serial port communication Modbus RTU as an example)
CHINT DDSU666 Single-phase Electric Energy Meter Modbus Communication Protocol
| Parameter Address | Decimal Conversion Table | Parameter Code | Parameter Description | Data Type | Data Length Word | Read/Write Attribute |
| 0000H | / | UcodE | Programming password codE | int | 1 | R |
| 0001H | / | REV. | Software version | int | 1 | R/W |
| 0002H | / | CLrE | Electric energy reset CLr.E | int | 1 | R/W |
| 0003H | / | RESERVED | Reserved | int | 1 | R/W |
| 0004H | / | RESERVED | Reserved | int | 1 | R/W |
| 0005H | / | ChangeProtocol | Protocol switching setting | int | 1 | R/W |
| 0006H | / | Addr | This address is only valid when using Modbus-RTU | int | 1 | R/W |
| 0007H | / | RESERVED | reserved | int | 1 | R/W |
| 0008H | / | RESERVED | reserved | int | 1 | R/W |
| 0009H | / | RESERVED | reserved | int | 1 | R/W |
| 000AH | / | RESERVED | reserved | int | 1 | R/W |
| 000BH | / | RESERVED | reserved | int | 1 | R/W |
| 000CH | / | BAud | Baud rate | int | 1 | R/W |
| 000DH | / | RESERVED | Reserved | int | 1 | R/W |
| 000EH | / | RESERVED | Reserved | int | 1 | R/W |
| 000FH | / | RESERVED | Reserved | int | 1 | R/W |
| 0010H | / | RESERVED | Reserved | int | 1 | R/W |
| 2000H | 8192 | U | A-phase voltage | float | 2 | R/W |
| 2002H | 8194 | I | A-phase current | float | 2 | R/W |
| 2004H | 8196 | P | instantaneous total active power | float | 2 | R/W |
| 2006H | 8198 | Q | instantaneous total reactive power | float | 2 | R/W |
| 2008H | 8200 | S | instantaneous total apparent power | float | 2 | R/W |
| 200AH | 8202 | PF | total power factor | float | 2 | R/W |
| 200CH | / | RESERVED | reserved | float | 2 | R/W |
| 200EH | 8206 | Freq | Grid frequency | float | 2 | R/W |
| 2010H | / | RESERVED | Reserved | float | 2 | R/W |
| 4000H | 16384 | Ep | Total active energy | float | 2 | R/W |
Now let's refer to the table above and fill in a "Total active energy" for demonstration
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