Optec - 6-ft. Serial cable for SSP photometers, DB-9 connectors (f/f)
The SSP photometer line uses a standard DB9 connector with standard RX, TX, and GND ports connected. A "Null Modem" serial cable is required to make the connection to a PC's 9-pin DB9 serial port. Each cable has a female DB9 connector on each end and is wired straight through. In other words, pin 1 on one side is wired to pin 1 on the other.
Null modem cable with female DB-9 connectors on both ends. This cable is need to connect the SSP to the COM port of a computer.