A single or set of characters communicated by a polled terminal, indicating to other stations on the line that the data to follow specify the addresses of stations on the line which are to receive the answeringmes-sage.

• 轮询终端通信用的单个或一组字符,向线路上的其它站表示其后的数据规定了线路上接收回答信息的站的地址。