Connects any RS232 serial device with DTE DB9 port to PC with DB9 serial port using a straight thru DB9 cable. This null modem adaptor converts any serial DTE DB9 port into DCE DB9 port. Pin-Out: 2-3 / 3-2 / 4-1,6 / 5-5 / 1,6-4 / 7-8 / 8-7. (Connectors: DB9 Female to Female)