Yes, probably, presuming one of the relays is not currently used. Since you build the system in 2010-ish, I presume you are running Mach3, right? I am way rusty on Mach3, but I think is some way to write a macro or something like that) that could do what you need. I would suggest asking in the MachSupport "Mach3" support forum as this is mostly a Mach question.