Connects any RS232 serial device with DTE DB25 to PC with DB25 serial port. This null modem adaptor also allows you to transfer files between two computers using its DB25 serial port along with a DB25 straight thru cable as well as all RS232 DTE to DTE connections. The added shielding provides data protection against EMI/RFI. Works with file transfer software that comes free with MS DOS & Windows and Laplink software. PinOut: 1-1 / 2-3 / 3-2 / 5,6,8-20 / 7-7 / 20 - 5,6,8 / G-G. (Connectors: DB25 Female to Female)