CablesOnline DB9 Serial Null Modem Male to Male Data Transfer Adapter/Gender Changer , (2-Pack) (AD-N05-2) (1) DB9 Null Modem Male to (1) DB9 Null Modem Male Connector Connect two DTE or DCE devices with no conflict in data transmission Crossed receive and transmit conductors Designed with a rugged, overmolded construction that provides protection and solid connection 2x Adapters included