In the back of your PBP manual you can find a chart showing Serin2/Serout2
baud modes.

baud CON 2400 creates a constant value named baud which = to 2,400.

SerOut2 lcd, baud,["hello world"] is not going to give you 2400 bps inverted.

SerOut2 lcd, 16780,["hello world"] ' would.

You could opt for something like this rather than using the numeric value for
2400 inverted mode with Serout2;

baud CON 16780 ' Create CONstant baud which = 16780.

SerOut2 lcd, baud,["hello world"]