Hello everybody, Here I want to take some guidance before i can start my work for new product development.I am going to make product in which main CPU card will be communicating with other 16 scanner card.So I am looking for which communication method I have to adopt for communication between CPU and scanner cards.I though like I should use parallel bus interface like PCI or VME but it is very costly.Even Embedded card based on that are very costly so now I came to serial interface. Now I am thinking for any good fieldbus protocol like profibus,lonworks,interbus etc. If i am going for Profibus,then can anybody help me how I have to go?whether I have to implement by using specific protocol chip or by using software protocol with RS485 only? Please suggest me regarding this. Please reply me also my email id: premjic@masibus.com Thanking you, regds, Premji Chaudhari.
Hello Sir/Mr.Jay Thank for posting reply, As per you,I have to need enough processing power that I will have becoz I am going to select 32 bit with more than 100MHz clock microprocessor along with good system memory.So there is no doubt for processing power.Actually I am going to make product in whcich one main CPU card will be communicate with other 16 scanner I/O cards in same device.Now These scanner cards have one 16 bit microprocessor and some signal conditioning circuit by which they will process on field i/p data and they will be time-stamped.Now I have to implement proper methos between main CPU card and this scanner card so main CPU card will take data from these scanner cards. Initially I thought by using parallel interfacing using PCI,VME etc.But for this I have to pay much for readymade embedded CPU board as a main CPU in my product.Then I came to serial bus interface between these cards. So I want to implement such a protocol which has good ability,throughput,deterministic,error-correction,user fexibility,future expansion,low cost etc. Also to implement fieldbus,there are asic chips are available,but by that way again cost will come in to way.Although I can develop by software writing and using RS485 but I have to pay my time.so there is a hesitation... If any comment/idea,plz forward me. Thanks again. Premji.