Can we use USART or SPI using the Rabbitcore? What type of versions do we need to use these functions?

If it is possible, how is it possible to do this with DC?

I have Dynamic C 7.04 for TCP/IP updated from 6.56.
I cant install the latest update because it says no previous version detected.

Can anyone help???

You can use SPI, Rs232, Rs485 on the Rabbitcore. The version of the compiler will depand on the RCM you are using. The best way to get the DC is to get a dev kit. You decide which RCM you want to use and order dev kit. You will get a complete set to kick start your project.