re null modem pin serial bruce maynard drac uumeme chi il us wrote in article mal psuvm psu edu mitch lewars mal psuvm psu edu writes can someone give me the specs on a null modem cable i ferget which get crossed mal psuvm psu edu that s an easy one carry all pins straight thru with the exception of pins which should be crossed as someone else already mentioned don t carry thru the other pins plan a minimal null modem sg sg td rd rd td if you re transfering files betwen pcs this ought to work unless you have a persnickity comm program plan b null modem with modem control sg sg td rd rd td dcd dtr dtr dcd some comm software will wait for dcd before transferring anything such software will raise dtr to enable the modem to accept a call with this cable each side s dtr will drive the other s dcd plan c null modem with hardware flow control sg sg td rd rd td rts cts cts rts for high speed transfers you want the flow control plan d deluxe null modem combine b and c sg sg td rd rd td rts cts cts rts dcd dtr dtr dcd this one is ideal it leaves out dsr and ri rarely used anymore if you re really paranoid or you just have an th wire to spend you might add fg fg the pin numbers above are obviously for pin connectors i don t have a pin pinout handy wayne hamilton i net hamilton osiris cso uiuc edu lowtek box urbana il voice bbs
