ive bought 1 rcm3720, i just curious, do i need to order the dev kit or its just enough with the hardware. can i just download the software from intenet?
The Dynamic C development is freely available I believe (check the links above). You’ll still need a programming cable though… not sure how easy it would be to fabricate one yourself.
The programming cable can be ordered seperately from your supplier. I dont believe you’ll be able to fabricate one yourself easily since it does contain a level converter and possibly some inteligence. I’m not sure though. Still you’ll need to provide the RCM power and remember to pull its reset pin up.
The schematic is available on this website as well:
http://www.rabbit.com/documentation/schemat/090-0128.pdf
So it should be possible to do all the things yourself 
So to answer your question, it’s not needed
Ok so it looks like only a serial voltage level shifter. Not too difficult to build yourself then 
Thank you IwriteCode, I was too lazy to go search for the schematic.
You could probably use a MAX chip variant also then, though it’ll have to be to 3.3V level.
hi…if i want to use RCM3700
what type of dev kit shud i buy?can u all suggest or give me link what kind of product shud i order…
Now then if you go to the Low Cost dev kits link on this page
http://www.rabbit.com/products/rcm3700/
You can order the Dev Kit.
Now was that so hard?