ch340芯片usb转串口使用时：
1.在有些电脑上会频繁断线，有些电脑上则不会
2.出现的操作系统有winxp和win2000，别的没有测试
3.出现的频率在不同的电脑上不太一样，最多的一天十几次，很多的都是平均一天一次，使用时间是早上8点到晚上5点
第一次发帖求助，非常谢谢大家帮忙看看
使用的驱动如下：
; CH341SER.INF
; Driver for CH341 (USB=>SERIAL chip) V2.6
; WDM&VXD for Windows 98/ME/2000/XP
; Copyright (C) W.ch 2001-2007
;
[Version]
Signature = "$Chicago$"
Class = Ports
ClassGuid = {4D36E978-E325-11CE-BFC1-08002BE10318}
Provider = %WinChipHead%
DriverVer = 03/16/2007, 2.6.2007.03
[ControlFlags]
ExcludeFromSelect = USB\VID_1A86&PID_7523
ExcludeFromSelect = USB\VID_1A86&PID_5523
ExcludeFromSelect = USB\VID_4348&PID_5523
ExcludeFromSelect = USB\VID_4348&PID_5523&REV_0250
ExcludeFromSelect = USBSERPORT\SER5523
ExcludeFromSelect = CH341PORT\SER5523
[Manufacturer]
%WinChipHead% = WinChipHead
[WinChipHead]
%CH340SER.DeviceDesc% = CH341SER_Install, USB\VID_1A86&PID_7523
%CH341ASER.DeviceDesc% = CH341SER_Install, USB\VID_1A86&PID_5523
%CH341SER.DeviceDesc% = CH341SER_Install, USB\VID_4348&PID_5523
%CH340SER.DeviceDesc% = CH341SER_Install, USB\VID_4348&PID_5523&REV_0250
%CH341S98.DeviceDesc% = CH341S98_Install, USBSERPORT\SER5523
%CH341S98.DeviceDesc% = CH341S98_Install, CH341PORT\SER5523
[CH341SER_Install]
DelFiles = CH341S98.DelFiles.SYS
CopyFiles = CH341SER.CopyFiles.SYS, CH341SER.CopyFiles.DLL
AddReg = CH341SER.9X.AddReg, CH341SER.AddReg
[CH341SER_Install.NT]
CopyFiles = CH341SER.NT.CopyFiles.SYS, CH341SER.CopyFiles.DLL
AddReg = CH341SER.NT.AddReg, CH341SER.AddReg
[CH341SER_Install.NT.HW]
AddReg = CH341SER.NT.HW.AddReg
[CH341S98_Install]
DelFiles = CH341S98.DelFiles.SYS
CopyFiles = CH341S98.CopyFiles.VXD, CH341SER.CopyFiles.SYS
AddReg = CH341S98.9X.AddReg, CH341S98.AddReg
[CH341S98_Install.NT]
[CH341S98.DelFiles.SYS]
CH341S98.SYS, , , 1
[CH341SER.CopyFiles.SYS]
CH341S98.SYS, , , 2
[CH341SER.NT.CopyFiles.SYS]
CH341SER.SYS, , , 2
[CH341S98.CopyFiles.VXD]
CH341SER.VXD, , , 2
[CH341SER.CopyFiles.DLL]
CH341PT.DLL, , , 2
;安装DLL是可选的,DLL可以用于识别CH341端口和监视CH341端口的插拔事件
[CH341SER.9X.AddReg]
HKR, , DevLoader, , *NTKERN
HKR, , NTMPDriver, , CH341S98.SYS
[CH341SER.NT.AddReg]
HKR,,EnumPropPages32,,"MsPorts.dll,SerialPortPropPageProvider"
[CH341SER.NT.HW.AddReg]
HKR,,"UpperFilters",0x00010000,"serenum"
;上面这行用于枚举接在串口的即插即用设备,启动时将产生DTR和RTS信号,如果需要枚举,请将上面这行的分号去掉
[CH341S98.9X.AddReg]
HKR, , DevLoader, , *vcomm
HKR, , PortDriver, , CH341SER.VXD
HKR, , Contention, , *vcd
HKR, , ConfigDialog, , serialui.dll
HKR, , DCB, 3, 1C,00,00,00, 80,25,00,00, 11,00,00,00, 00,00,0A,00, 0A,00,08,00, 00,11,13,00, 00,00,00,00
HKR, , PortSubClass, 1, 01
HKR, , EnumPropPages, , "serialui.dll,EnumPropPages"