Pure Data MIDI fun :)

Using Arduino Interfacing w/ Software on the Computer
1

Hi!
I'm trying to remotely control a synthesizer by sending out midi CC values. I used midi cc table to do this. It supplies at most 127 parameters for each class A, B, and C midi values.
For now I can send parameters with CLASS A midi cc data. I do this by just using "ctlout #" in Pure Data
However, I need to access CLASS B midi parameters. What is this? and how do I send this kind of data?

Thanks very much!