# Single Bit 資料讀寫指令(01/05)(人機介面常用)

## 01 指令範例

{% hint style="info" %}
本指令不會重置C02.Del.Total清除累計數據選項，只提供人機介面01/05讀取Single Bit功能。 01 指令格式正確，會收到的控制端主機本體回覆，只能回覆讀取Bit行為。
{% endhint %}

### 控制端發(01)TX指令讀取格式範例

```
TX 請求指令： 01 01 00 0A 00 01 A4 0E
```

* Slave address: 01 (本流量計地址)
* Function code: 01 (1bit 讀取指令)
* 讀取數據的啟始地址: 02 01 (C02.Del. Total清除累計的啟始地址)
* 讀取資料Bit: 00 01 (讀取C02.Del. Total資料)
* CRC: AD B2 (依 CRC 算法計算出的糾錯碼)

### 流量計(01)RX讀取回覆格式範例

```
RX 回覆數據：01 01 01 00 51 88
```

* Slave address: 01(本流量計地址)
* Function code: 01(讀取指令)
* 讀取回覆Bit: 01 00(Slave 本體仍正常在線工作，並回應行為給控制端)
* CRC:  51 88(依 CRC 算法計算出的糾錯碼)

## 05 指令範例

{% hint style="info" %}
本指範例將會啟用C02.Del. Total清除累計數據選項，total 會歸零。
{% endhint %}

### 控制端發(05)TX指令格式範例

```
TX 請求指令：01 05 02 01 FF 00 DC 42
```

* Slave address: 01(本流量計地址)
* Function code: 05(Register寫入指令)
* 寫入數據的啟始地址: 02 01(C02.Del. Total清除累計的啟始地址)
* 寫入資料:  FF 00(寫入重置C02.Del. Total資料 <mark style="color:blue;">)</mark>
* CRC: DC 42(依 CRC 算法計算出的糾錯碼)

### 流量計(05)RX回覆格式範例

```
RX 回覆數據：01 05 02 01 FF 00 DC 42
```

* Slave address: 01(本流量計地址)&#x20;
* Function code: 05(Register寫入指令)
* 寫入數據的啟始地址: 02 01(寫入C02.Del. Total清除累計記憶體地址)
* 寫入資料:  FF 00 (主機本體回覆寫入重置行為給控制端)
* CRC:  DC 42(依 CRC 算法計算出的糾錯碼)


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