所以以太网总是对程序器通讯可用的。用Seriall/OCOMM_REQ执行串行协议可以被扫描时间限制。例如，如果协议要求从远程设备请求–个确定信息时，远程设备必须在接收到请求信息5ms内开始响应，当扫描时间是5ms或更长时这个方法可能不会成功，因为不能保证及时响应。
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