说明：  大延东辉系列仪表串行通讯协议为多种仪表所兼容,此代码包是测试例程,稍加修改即可使用到具体数据采集应用中去.
(Extension Donghui Series Instrument serial communication protocol for a variety of instruments are compatible with this code package is a test routine, a little modification you can use to specific applications to data acquisition.)