Cant find any info on the rc250p pulser control. One on ebay now and wonder if it would connect to my 300sm. Price is low enough that cant lose much and it could be pretty handy if it worked. My process would be pulsed mig. Saturday so Arc products cant help....Airco 300 squarewaveMig welding center...Powcon sm300/LN 25Powcon sm200/PD lHypertherm PM 1100Miller AEAD 200LE W/LN25 FCand now another sm200 pd l combo.