1 bit separations question

Is it possible to generate 1 bit tiffs as negatives to send to our
platesetting system? I successfully generated positives. Taking the 1 bit
tiffs into photoshop ad inverting the colors did not help.
If it is possible, what switch do I use? If not does anyone have an
estimate how much work it would be to add that capability, or a modile I
should look into to see about adding it? ( I can do some programming in
C/C++)

Thanks
Mark