I work with remote controlled cameras (http://www.egripment.com/en/ProductInfo.asp?ID=109) and was wondering if anyone knows if its possible to format messages in RS422 form the windows version of PD using the "serial" object.(i use osx but would consider getting an old pc if its possible)

Its a long shot i know..

Yes, that's perfectly possible. RS422 is just a differential physical layer of RS232 (standard serial). You need to get an RS232/422 line driver converter and then
find out what baud rate your camera controller needs - the rest should be doable
in Pd.

thanks. I'll look into the converter/baud rate.

Do you think this would be able to do it?

Using the [midiout] object in linux and the box would convert to RS422? (with a midi to dmx converter thrown in for free)

http://www.cinetix.de/interface/english/midiser.htm

Only a qualified (80%) yes. The possible pitfall is limitations with the [midi] objects in Pd.
It might work fine, but using [comport] will give you much more flexibility including parity bit settings, baudrate, handshaking and poll period adjustments.

Things like these are probably the most useful

http://www.commfront.com/RS232-RS485-RS422-Serial-Converters/RS-232-Converters.htm
http://www.rs422.com/dta6132.htm