Messages in which line control characters must be inserted upon departure from a terminal and deleted upon arrival at a terminal; fixed format messages are intended for terminals with dissimilar characteristics.

• 一种格式化的报文,在离开终端时必须在报文里插入行控制符,而在到达终端时必须从中删去行控制符。固定格式报文是为了适应不同特性的终端。