For starters, Decimal 15 does not equal 0x0D
Hexidecimal 0x0F equals Decimal 15,
but this isn't C. For Picbasic (Pro at least) the Hex is represented $0F.

From reading the PBP manual (that's PicBasic Pro),
It appears to me that serout cannot send raw data.

The example you were given before:
"SEROUT 0,N2400,[#B0,10] ‘ Send the ASCII value of B0 followed by a linefeed out Pin0 serially"
is only sending a string because a linefeed is the ASCII control code associated with the decimal value 10,
and the command line is going to send the ASCII representation of variable B0 before that (still a string).

That being said I'm suprised even the plain vanilla PicBasic can't send proper serial data.
I can't be sure since I don't have the manual for it.
I am sure that PBP can send raw serial data... I do it all the time.
Art.