PLC communication

I'm making some assumptions here, but:

Since you are using RSLinx as a comm server I assume you are communicating with an Allen-Bradley PLC. Since you are a student I will further assume the plc is either an SLC or Micrologix and you are communicating via RS-232 (these are the least expensive options).

IF all of this is true you are communicating using a protocol called DF1. Take a look at this link:
http://literature.rockwellautomation.com/idc/groups/literature/documents/rm/1770-rm516_-en-p.pdf#xml=http://127.0.0.1/texis/search/pdfhi.txt?query=DF1+protocol&pr=literature.rockwellautomation.com&prox=page&rorder=500&rprox=750&rdfreq=0&rwfreq=0&rlead=250&sufs=1&order=r&cq=&id=41fa2cc5a
for the DF1 command set reference.

Have fun.
KEith

Thank you very much, it seems to be a little complex, but the documents you gave me is going to help me a lot !

And you were right, i'm using a SLC, communicating with RS-232 !!

Just curious, why not use RSlinx? You already have it.

Follow this link http://www.plctalk.net/qanda/showthread.php?t=10339 It has a free:beerchug: DF1 Driver for .net

Thanks for the link :nodi:

Our clients have to buy a liscence for RSLinx too, so we want to cut this expenditure off, and make our own communication driver.

thank you for help !!