Does anyone have any experience with modbus programming in VB? Is it pretty similar to serial port programming?
Where can I get a master dll for free?
Thanks
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Does anyone have any experience with modbus programming in VB? Is it pretty similar to serial port programming?
Where can I get a master dll for free?
Thanks
Here is a couple of links to answer your questions
http://www.codeproject.com/KB/trace/modbuscs.aspx
I guess the second link landed in no-man's land
http://en.wikipedia.org/wiki/Modbus
Modbus is a software specification that governs how information is bundled into packets and sent and does not specifiy what medium the data is sent on. It can be sent over serial ports (RS-232, RS-422 or RS485) or it can be sent over TCP connections. So yes, Modbus can literally be serial port programming or it can be TCP programming depending on the hardware you are trying to communicate with. Most of what I do uses Modbus connections, so if you need some more modbus specific info, let me know and I'll help if I can.
kevin
ps... here is a link to the Modbus specification