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步骤1：
开始+从器件地址(PCA9548A)+写入+控制字节(仅启用通道0)+停止<<only channel 0 is enabled just incase the other channels have the same slave device so we want to avoid this if this is true
步骤2：
开始+从地址(光纤模块0)+写入+控制字节(0x5)+停止<<this writes to a slave #0 setting the pointer of slave#0
步骤3：
开始+从地址(光纤模块0)+读取+数据(光纤模块0从0x5发送数据)+停止<<this is the register we want to read from, yes?
步骤4：
开始+从器件地址(PCA9548A)+写入+控制字节(仅启用通道1)+停止<<we want to talk to slave 1 on channel 1 only
步骤5：
开始+从地址(光纤模块1)+写入+控制字节(0x3)+停止<<this writes to a slave #1 setting the pointer of slave#3
步骤3：
开始+从地址(光纤模块1)+读取+数据(光纤模块1从0x3发送数据)+停止<<this is the register we want to read from, yes?
