1. DH7655振弦式数据采集模块可根据上位机或中心站的命令实现巡测、选测或点测、自动巡测等进行数据采集功能：
   (1)巡测：即逐点依次自动切换模块的每个通道进行测量，采集对应传感器数据；
   (2)选测或点测：即针对某一个测点或某几个测点对应的通道进行测量采集传感器数据；
   (3)自动巡测：指定时间测量指中心站设置了每天指定采集测量的时间点(不超过6个)，采集模块自动在这些时间点进行巡测；指定时间段指中心站设置了每天的起始测量时间、结束测量时间和测量时间间隔，采集模块根据这些设置参数自动进行巡测。

2. 具有掉电保护的大容量数据存储功能
   DH8221振弦式数据采集模块内具有掉电保持的存储器，每次测量的监测数据将自动根据测量方式存储指定位置；实时数据，随时读取，随时更新；历史数据，根据先进先出策略覆盖存储。对存储的实时数据或历史数据，中心站都可以在任何时间读出。可选配大容量的SD卡，数据以文件系统的形式存储，用于存储密度比较高，数据量比较大的场合。

3. 多种通信接口和多种通信模式

4. DH7655 Vibrating String Data Acquisition Module can realize data acquisition functions such as patrol, selection, point and automatic patrol according to the command of host computer or central station.

5. (1) Patrol: that is to automatically switch each channel of the module point by point to collect corresponding sensor data;

6. (2) Selection or point measurement: that is to measure and collect sensor data for a certain measuring point or channel corresponding to several measuring points;

7. (3) Automatic patrol: The designated time measurement means that the central station has set up the designated time points (no more than 6) for acquisition and measurement every day, and the acquisition module automatically patrols at these time points; the designated time period means that the central station has set the starting time, the ending time and the measuring time interval for each day, and the acquisition module automatically patrols according to these set parameters.

8. Large-capacity data storage function with power-down protection

9. DH8221 Vibrating String Data Acquisition Module has a power-down memory, each measurement of monitoring data will automatically store the designated location according to the measurement method; real-time data, read at any time, update at any time; historical data, according to the first-in-first-out strategy to cover the storage. For stored real-time data or historical data, the central station can read it at any time. Large capacity SD card can be selected to store data in the form of file system, which can be used in situations with high storage density and large amount of data.

10. Various communication interfaces and modes

三、实物图