> For the complete documentation index, see [llms.txt](https://docs.lorric.com/qr/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.lorric.com/qr/fp-as510-paddle-wheel-flowmeter-manual-chinese-v2/communication/modbus-rtu-protocol/du-xie-xing-ji-yi-ti.md).

# 讀寫型記憶體

| **功能碼** | **名稱**               | **數據長度**       | **核心用途**                                                                                                        |
| ------- | -------------------- | -------------- | --------------------------------------------------------------------------------------------------------------- |
| 03      | 讀寫型記憶體讀取指令           | 1\~125 個暫存器    | 讀取單個或多個保持暫存器，用於讀取任何想要知道的設定參數。                                                                                   |
| 06      | 讀寫型記憶體單 Register寫入指令 | 1 個暫存器(16 bit) | 用於寫入一個簡易的單個 Int16 參數的值，適用設定選項、設定代碼、設定小範圍整數。例如：將 **C02 清除累積（Del Total）** 寫入 1，觸發累積流量歸零。                          |
| 30      | 讀寫型記憶體雙 Register寫入指令 | 2 個暫存器(32 bit) | 用於寫入浮點數，Float32 或Int32 等 32 位元的數據，適用於有小數、正負數、介於約 10⁻³⁸ 到 10³⁸ 之間的參數設定。例如：設定 **A02 比例係數（Scale Factor）** 為 +1.25。 |


---

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