SAE J1939转ModBus RTU模块 YMMCS-7001使用说明及心得体会

SAE J1939总线是工程机械行业常用总线,发动机、车辆等运行参数都可以通过该总线获取。

常规电控系统以PLC加组态屏方案为主,具有RS485接口,ModBus RTU协议进行总线组网。

YMMCS-7001 协议转换模块直接可将SEA J1939总线数据进行解析并保存到ModBus协议寄存器中,作为从设备非常方便PLC及组态屏等设备读取。

下图已对接发动机为例,对接车辆及其他J1939设备同理。

 

下图为本人使用modBus poll软件读取YMMCS-7001模块数据截图,总体来说使用方便,数据准确:

 

本人总结在调试YMMCS-7001过程中遇到的一些问题如下:

1.modBus Poll软件读不到数据,正常读取数据modBus灯会闪烁,不闪烁的话应该是modBus通讯问题,从以下几个方面着手:

  ①检查红色电源指示灯是否亮,需要24V供电;

  ②电脑读取数据的话,检查USB转RS485线端口号是否正确,波特率是否设置正确(他们说明书上有)

  ③120欧姆电阻是否接入正确

  ④modBus Poll软件

SAE-2020-J3101 美国汽车协会2016年发布的关于车辆硬件安全方面的标准J3101。Automotive computer systems are required to establish trustworthiness through device identity, sealing, attestation, data integrity, and availability. These systems must be res小 ent to a wide range of attacks that cannot be thwarted through software-only security mechanisms. A hardware root of trust and the hardware-based security primitives are fundamentally necessary to satisfy demands of connected and highly or fully automated vehicles. This document provides a comprehensive view of security mechanisms supported in hardware for automotive use cases, along with best practices for using such mechanisms. The goal of this document is to provide a common reference that facilitates communication among engineers across different parts of the automotive supply chain relevant to hardware-enabled security features. Silicon vendors will find this document useful in understanding the hardware security foundations and their corresponding use cases and applications that they should support to address vehicle security needs. This document should also bring more order into the diverse nature of hardware security features, so products are developed with the end use case in mind and with the right level of security. ECU suppliers and system integrators will benefit from the different security requirements and use cases outlined here as they assess the threats that affect their systems and the right hardware systems needed to address them.
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