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PGA460: 预设1突发命令(0号命令)没有响应

Part Number: PGA460

向PGA460发送0号命令后没有响应,用示波器看没有输出脉冲,再就是用预设1的广播命令却可以正常输出,确定没有改变460的串口通信地址,因为同样发其它命令都是正常响应的。求大神解惑