# Python Module: a2y_mew
a2y_mew模块实现了扩展的Mewtocol通信协议。原始的Mewtocol来自Panasonic，用于其FP系列PLC与上位机、触摸屏等设备通信。
本模块在以下方面对Mewtocol进行了扩展：
- 地址空间从8位整数扩展为不定长，最高可达32位。为了兼容性，最小为8位，在报文中至少占两个字节。
- 通讯方式从半双工增强为全双工，即主从双方可以同时发送数据。当从设备发生了某个事件（例如，输入点发生了变化），可以主动给主机发送报文。
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