ModBus protocol debugger, VB of the original program, you can see the messages sent and returned

Client.RES
db.dll
frmMain.frm
frmMain.frx
modbus.bas
ModBus_Debuger.vbp
ModBus_Debuger.vbw
ModBus调试软件.exe
MSCOMM32.OCX
MSSCCPRJ.SCC
SkinH_VB6.dll
安装程序\ModBus调试软件.CAB
........\setup.exe
........\SETUP.LST
........\.upport\ASYCFILT.DLL
........\.......\Client.RES
........\.......\COMCAT.DLL
........\.......\db.dll
........\.......\ModBus调试软件.BAT
........\.......\ModBus调试软件.exe
........\.......\MSCOMCTL.OCX
........\.......\MSCOMM32.OCX
........\.......\msvbvm60.dll
........\.......\OLEAUT32.DLL
........\.......\OLEPRO32.DLL
........\.......\SETUP.EXE
........\.......\Setup.Lst
........\.......\SETUP1.EXE
........\.......\SkinH_VB6.dll
........\.......\ST6UNST.EXE
........\.......\STDOLE2.TLB
........\.......\VB6STKIT.DLL
........\.......\工程1.DDF
ModBus_Debuger.PDM
安装程序\Support
安装程序

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