Using this in a loop plot 88 layouts, the Acrobat pdf opens then gives an error message about 20 pdf's in but keeps going creating all 88 pdf's.
(COMMAND "-PLOT" "Y" "" "DWG To PDF"
"Iso full bleed A3 (420.00 x 297.00 MM)" "m" "LANDSCAPE" "N" "W" "-6,-6" "807,560" "1=2" "C"
"y" "Acad.ctb" "Y" "n" "n" "n" pdfName "N" "y"
)