| 术语 | communications codes |
| 释义 | communications codes 通信(代)码 A set of codes used in communications, for example, ASCII is one of the most often used and accepted codes. Special characters are set aside for the purpose of communications control. These control functions include synchronization, message heading, and control. Of the other existing codes, the more widely used ones are: EBCDIC, extended binary coded decimal interchange code; the 5-bit Baudot code found in old teleprinter equipment; the four of eight code; the IBM punched-card Hollerith code; the BCD, binary coded decimal, code; and the 6-bit transcode. EBCDIC is an 8-level code similar to ASCII except that while ASCII uses its eighth level for parity bits, EBCDIC uses it for information bits, thereby extending the range of characters to 256. 通信技术中使用的一组代码,例如,ASCII是最常用的一种代码,其中一些特殊字符用于通信控 制,包括同步、报文标头、控制等。其它应用较为广泛的代码还有:扩充的二—十进制交换码EBCDIC;旧式电传打字机中采用的五位博多码;八中取四 码;IBM穿孔卡片所用的霍勒内斯码;二—十进制码BCD以及六位编码等。EBCDIC码和ASCII码都是八位码,不同之处是:ASCII码把第八位用作奇偶位,而EBCDIC码把第八位仍用作信息位,从而使字符总数达256个。 |
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