Controlling a VFD with MODBUS for laptop serial port
Controlling a VFD with MODBUS for laptop serial port
(OP)
I just want to be able to demonstrate the operation of a VFD with MODBUS.
I am not a MODBUS expert. In fact I know very little.
I am looking for software to make my laptop a Master and control one VFD through my serial port. Then a converter to change RS 232 to RS 485.
Has anyone out there done this.
Super thanks.
I am not a MODBUS expert. In fact I know very little.
I am looking for software to make my laptop a Master and control one VFD through my serial port. Then a converter to change RS 232 to RS 485.
Has anyone out there done this.
Super thanks.





RE: Controlling a VFD with MODBUS for laptop serial port
http://www.win-tech.com/html/modbus1.htm
RE: Controlling a VFD with MODBUS for laptop serial port
Thanks for your response I have seen Modscan.
I am looking for someone who has done this. What program one has used and what RS 232 to RS 485 converter was used and some helpfull hints.
J Schweitzer
RE: Controlling a VFD with MODBUS for laptop serial port
Eng-Tips: Help for your job, not for your homework Read FAQ731-376
RE: Controlling a VFD with MODBUS for laptop serial port
As jraef says, you need to get the ModBus register mapping from the VFD vendor.
The next recommended step is to see if you can read a few Modbus registers and if the data make sense. Once you can read data, then you can look at trying to do control.
RE: Controlling a VFD with MODBUS for laptop serial port
Modscan works OK if your desired application isn't too complicated. You can create a simple custom display type of page with some bar graphs or dial meters. It's just not real nice to write data, basically you get a pop-up box where you enter the value.
I don't know of any other software offhand that would be any better. It's likely that you'd need to program your own application if you want to get fancy.