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升级软件过后USB串口诊断报告还显示旧的固件版本
硬件: Serial>>RS-485
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问题: 我升级了USB-485/4的驱动软件，并且从系统的USB端口上断开了USB-485/4进行固件升级。但是为什么当我把USB-485/4重新连接至我的系统并且运行诊断工具时，仍然得到旧的固件版本的报告？
解答: USB-485的固件是在设备被第一次上电的时候下载的。因为USB-485/4是外部上电的，电源连接必须被断开以保证固件升级的完成。只是简单的将USB线从USB口上拔掉但是电源仍然连接着是不足以升级固件的。
相关链接:
Product Manuals: Serial Hardware and Software for Windows User Manual
KnowledgeBase 2N8HFTYF: USB-485 or USB-232 COM Port Assignments Out of Sequence
KnowledgeBase 2N8HFTYF: USB-485 or USB-232 COM Port Assignments Out of Sequence
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报告日期: 07/09/2002
最近更新: 01/30/2012
文档编号: 2N8HRBYF