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ABB PHARPSCFE00000
ABB PHARPSCFE00000
ABB PHARPSCFE00000
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通信模块采用CAN总线和RS-232总线模块实现，其电路图如图3所示。
RS-232电平转换器可以将输入的&plu***n;5V电源电压转换为RS-232输出电平所需的&plu***n;10V电压。CAN收发器选用PCA82C250。PCA82C250是CAN控制器与物理总线之间的接口，可提供对CAN总线上数据的差动发送和接收功能。
. 4系统软件设计
本系统软件设计分为两部分：上位机采用Lab-Windows／CVI为开发平台，下位机以g6E为平台，采用汇编语言编写。从功能上软件设计可分为：系统初始化程序、主程序、串口中断及定时器中断程序。双机通信协议约定如下：
aa+55+功能位+数据位+校验位
其中，前两个字节为前导码，第三个字节为控制命令，单片机根据此字节进行相应处理。第四个字节为具体控制数据，***后为校验数据。根据此协议，上位机每次发5个字节。下位机接收到有效的前导码后进行相应的动作。
5结束语
本测试信号源已投入使用，系统运行可靠、性能稳定，体现了良好的实用性与较高的性价比，完全能够满足各种测试环境的要求。
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