Devices have to start transmitting their response to a valid command within 4–12 μs and are considered to not have received a command or message if no response has started within 14 μs.
设备必须在4-12微秒内开始将其响应发送到一个有效命令，并且如果在14微秒内没有开始响应，则认为没有接收到命令或消息。