> 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/fu-lt-ultrasonic-flowmeter-manual-chinese-v1/communication/modbus-rtu-protocol/du-xie-xing-ji-yi-ti.md).

# 讀寫型記憶體

<table data-header-hidden><thead><tr><th width="123.6923828125"></th><th width="137.8948974609375"></th><th width="126.61181640625"></th><th></th></tr></thead><tbody><tr><td><strong>功能碼</strong></td><td><strong>名稱</strong></td><td><strong>數據長度</strong></td><td><strong>核心用途</strong></td></tr><tr><td>03</td><td><p>讀寫型記憶體</p><p><mark style="background-color:orange;">讀取指令</mark></p></td><td><p>1~125 個</p><p>暫存器</p></td><td>讀取單個或多個保持暫存器，用於<mark style="background-color:orange;">讀取</mark>任何想要知道的設定參數。</td></tr><tr><td>06</td><td><p>讀寫型記憶體</p><p>單 Register </p><p><mark style="background-color:yellow;">寫入指令</mark></p></td><td><p>1 個暫存器 </p><p>(16 bit)</p></td><td><p>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。</p><p>例如：將 A08 管徑材質 ( Pipe Material) 設定為 PVC (代碼 2)。</p></td></tr><tr><td>30</td><td><p>讀寫型記憶體</p><p>雙 Register</p><p><mark style="background-color:yellow;">寫入指令</mark></p></td><td><p>2 個暫存器 </p><p>(32 bit)</p></td><td><p>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。 </p><p>例如：設定A18 強制歸零 (Low Flow Cutoff ) 為 +5.5 、設定 A23 零點偏差校正 (Zero Offset) 為 -0.08 。</p></td></tr><tr><td>31 </td><td><p>讀寫型記憶體</p><p>四個 Register </p><p><mark style="background-color:yellow;">寫入指令</mark></p></td><td><p>4 個暫存器 </p><p>(64 bit)</p></td><td><p>用於寫入 Int64 等 64 位元的數值範圍，適用於 數值範圍超過 32 位元 ( 43億) 的超大整數設定。</p><p>例如：設定 D11 累計目標 (Total Target 64) 或是 C04 批量控制 (Dosing Target 64) 為超過32位元的數值。</p></td></tr></tbody></table>


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