# 讀寫型記憶體單Register寫入指令(06)

{% hint style="info" %}
限使用在 Register 長度為 1 的記憶體，請參考[列表](/qr/fp-as510-paddle-wheel-flowmeter-manual-chinese-v2/communication/modbus-rtu-protocol/read-write-memory-list.md)。
{% endhint %}

## 指令範例

### 控制端發指令(06)格式

| Byte#      | 1             | 2             | 3        | 4        | 5    | 6    | 7   | 8   |
| ---------- | ------------- | ------------- | -------- | -------- | ---- | ---- | --- | --- |
| Node ID    | Slave Address | Function Code | 寫入的記憶體地址 | 寫入的記憶體地址 | 寫入資料 | 寫入資料 | CRC | CRC |
| 範例內容01\~FF | 01            | 06            | 00       | 00       | 00   | 01   | 48  | 0A  |

#### 控制端發訊範例說明

這個範例會改變A01的管徑選項

slave address: 01(本流量計地址)

function code: 06(單一Register寫入指令)

讀取數據的啟始地址: 0000(要寫入記憶體地址)

寫入資料: 0000 (1" PVC管)

CRC: C40B (依 CRC 算法計算出的糾錯碼)

### 流量計回覆(06)格式

| Byte#      | 1             | 2             | 3        | 4        | 5    | 6    | 7   | 8   |
| ---------- | ------------- | ------------- | -------- | -------- | ---- | ---- | --- | --- |
| Node ID    | Slave Address | Function Code | 寫入的記憶體地址 | 寫入的記憶體地址 | 寫入資料 | 寫入資料 | CRC | CRC |
| 範例內容01\~FF | 01            | 06            | 00       | 00       | 00   | 01   | 48  | 0A  |

#### 流量計回覆範例說明

寫入指令符合格式，會將收到的控制端指令回傳給 Master

slave address: 01(本流量計地址)

function code: 06(單一Register寫入指令)

讀取數據的啟始地址: 0000(要寫入記憶體地址)

寫入資料: 0000 (1" PVC管)

CRC: C40B (依 CRC 算法計算出的糾錯碼)


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