ICS TRIPLEX T8451可编程控制模块
Device Addr(Hex)这里就是设置从机地址的参数,主机在读写数据的时候都需要设置从机地址为这个数据,否则读写数据会出错,然后设置好发送周期(根据主机发送数据频率设置,由于我们这里主机是手动发送数据,所以可以把周期设置长一点),点击自动发送,这样软件就会周期性的调用VII_SlaveReadBytes()函数来获取适配器接收到的数据,如果没接收到数据,这个函数会返回0字节数据。
ICS TRIPLEX T8451可编程控制模块这些都做好后,从机就等待主机发送数据了,如果接收到数据后就在PC调用VII_SlaveReadBytes()函数的时候将数据返回,现在主机做如下设置并点击发送,从机界面就能显示接收到的数据:
从机发送数据工作流程:
从机发送数据需要先将数据写入适配器内部缓冲区中,然后主机产生时钟信号后,从机就会自动把数据发送出去,所以在从机设置设置好相关参数后,设置好要发送的数据,然后点击发送,数据就发送到适配器内部缓冲区了,然后主机就可以将数据从从机读回来。
从机发送数据:
主机读取数据:
后记:
从机模式在协助主机程序开发时有很大的用处,在不确定主机控制对象是否正常工作或者主机控制程序是否正常工作的时候可以利用从机来验证主机控制程序,这样可以加速定位问题所在。
I2C通信的时候,在同一个总线上可以挂多个设备,主机和从机之间的数据传输都是通过地址来寻址的,所以在调试的时候一定要注意主机和从机的地址必须匹配,否则会出现无法正常通信的问题。ACE-MINI 的优点
针对所有配备单一 PCI 插槽的 Mini-ITX 主板而设计
机箱搭载 110-220V ATX 电源供应器
PCI 游戏 I/O 卡 (ACE-B2019/A)
ACE-MINI-A 的功能(具备 ACE-B2019A)
In some cases, a single switch can not meet the needs of the site, so the switch stacking technology appears. Multiple switches are combined to work together, which can provide more ports in a limited space. What's the point of switch stacking? Next, feisong industrial exchange will analyze it for you.
Multiple switches are stacked to form a stacking unit. There is a parameter of "maximum stackable number" in the performance index of stackable switches, which refers to the maximum number of switches that can be stacked in a stacking unit and represents the maximum port density that can be provided in a stacking unit.
Mainstream switches in the market can be divided into stackable and non stackable tyes. Among the switches that can be stacked, there are virtual stacking and real stacking.
The so-called virtual stack is actually a cascade between switches. Switches are not stacked through dedicated stacking modules and cables, but through fast Ethernet ports or Giga Ethernet ports. In fact, this is a disguised cascade.
Virtual stacked multiple industrial switches can be managed as a logical device in the network,