多年来一直专注于工业自动化领域的高品质工业模组***贸易。我们专注于PLC组件数控和伺服驱动机器故障？购置更换零件？停产设备麻烦？DCS系统PLC系统机器人系统备件解决方案不要犹豫与我们联系！我们可以提供快速和合格的工业备件援助。************************************************************************ABBPHARPSCFE00000ABBPHARPSCFE00000ABBPHARPSCFE00000*****************************************************************************************************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。作为上位机的PC通过其串行接口发送数据，产生RS-232电平信号，由电平转换电路将RS-232电平信号转换成单片机所能接受的TTL／CMOS电平信号，并传到协议转换单元的单片机，单片机将接收到的数据打包、转换后，通过CAN收发器发送至CAN总线。挂在CAN总线上的下位机节点收到数据后，根据控制命令做出相应动作。上位机与下位机通信示意图如图4所示。.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。P0916WDP0916WEP0916WFP0916WGP0916WHP0916WJP0916WKP0916WLP0916WMP0916WNP0916WPP0916WQP0916WRP0916WSP0916XGP0916XHP0916XJP0916XKP0916XLP0916XMP0916XNP0916XPP0916XQP0916XTP0916XZP0916YAP0916YBP0916YEP0916YHP0916YWP0916YYP0916YZP0917ACP0917ADP0917AKP0917BDP0917BHP0917BKP0917BZP0917CAP0917CBP0917CCP0917CHP0917CJP0917CKP0917CLP0917CMP0917DNP0917DWP0917GYP0917GZP0917HAP0917HBP0917HCP0917HDP0917HUP0917HXP0917JAP0917JGP0917JHP0917JJP0917JKP0917JLP0917JMP0917JPP0917JQP0917JRP0917JSP0917JTP0917JUP0917KYP0917LAP0917LEP0917LHP0917LLP0917LPP0917LSP0917LVP0917LYP0917MFP0917MGP0917MHP0917MJP0917MXP0917PBP0917QWP0917QZP0917RFP0917RGP0917RHP0917SYP0917TNP0917TQP0917VCP0917VUP0917XKP0917XNP0917XQP0917XVP0917XWP0917XXP0917YCP0917YDP0917YFP0917YJP0917YTP0917YVP0917YWP0917YXP0917YZP0918AEP0918AHP0918BHP0918BMP0918BPP0918BSP0918BTP0918BWP0918CDP0918CFP0918CZP0918FJP0918FKP0918FLP0918FMP0918FNP0918FWP0918FXP0918FYP0918HNP0918HPP0918HZP0918JCP0918JFP0918JPP0918JRP0918JTP0918JVP0918JYP0918KEP0918KGP0918KJP0918KMP0918KXP0918LAP0918LCP0918LEP0918LGP0918LJP0918LLP0918LPP0918LWP0918LYP0918MAP0918MDP0918MFP0918MHP0918MLP0918MTP0918MVP0918MXP0918NDP0918NGP0918NJP0918NLP0918NNP0918NQP0918NSP0918NUP0918NXP0918NZP0918PBP0918PEP0918PHP0918PKP0918PMP0918PQP0918PTP0918PZP0918QCP0918QEP0918QHP0918QKP0918QMP0918RKP0918RPP0918RQP0918RYP0918SQP0918SSP0918SUP0918SXP0918TGP0918TKP0918TNP0918TRP0918TTP0918UHP0918VAP0918VCP0918VDP0918VJP0918VKP0918VLP0918VMP0918VNP0918VPP0918VQP0918VRP0918WAP0918WBP0918WCP0918WDP0918WEP0918WFP0918WGP0918WHP0918WNP0918WQP0918XAP0918XBP0918XCP0918XDP0918XEP0918XFP0918XGP0918XHP0918XMP0918XNP0918XRP0918XSP0918XTP0918XUP0918XXP0918YAP0918YJP0918YMP0918YNP0918YPP0918YRP0918YSP0918YZP0918ZKP0918ZPP0920AAP0920ABP0920ACP0920AGP0920AHP0920AJP0920CCP0920CDP0920EAP0920EBP0920ECP0920EFP0920EGP0920EHP0920EJP0920EKP0920FAP0920FBP0920FDP0920FFP0920FGP0920FHP0920PCP0920PDP0920PKP0920PLP0920PVP0920PWP0920SAP0920SBP0920SCP0920SDP0920SEP0920SKP0920SLP0920***P0920SNP0920SPP0920SQP0920SRP0920SSP0921CEP0921CFP0921CKP0922ADP0922AEP0922AFP0922AGP0922ASP0922AWP0922AYP0922BDP0922BEP0922BFP0922BKP0922BQP0922BVP0922BWP0922CHP0922CJP0922CKP0922CQP0922CRP0922CUP0922CVP0922CWP0922CXP0922CYP0922CZP0922DAP0922DBP0922DDP0922DRP0922EDP0922ETP0922EUP0922FMP0922FNP0922GUP0922HRP0922HSP0922HZP0922JAP0922JCP0922JEP0922JLP0922JNP0922JUP0922JXP0922JYP0922KCP0922KDP0922KEP0922KFP0922KJ)