Connects any RS232 serial device with DTE DB9 port to PC with DB9 serial port using 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 Male to Female)