STD工业控制机DMA通信板的设计

The design of DMA Communication board Based on STD Bus Computer

本文讨论了一种用 ８２５７ ＤＭＡ控制器及多规程串行控制器（ＭＰＳＣ）８２７４开发的通信板，该通信板插在ＳＴＤ机箱，可实现数据的发送与接收，其数据通信采用高级规程（ＳＤＬＣ）协议，采用ＤＭＡ传送方式及ＲＳ－４２２接口标准。

This paper describes a kind of communication board,on which DMA8257 controller and MP- SC8274 are used. The communication board can be inserted in STD computer to manage the data transmitting and receiving. The data communication protocal obeys the HDLC protocal,and It uses DMA transmission manner and RS-422 interface standard.