FTDI is a manufacturer - they make several different cables. The one you want is:
http://www.dontronics-shop.com/ftdi-...ter-cable.html
This is a TTL level converter. A standard USB to serial cable won't drive the EQ6. The serial end will have to have a d9 connector soldered on using the wiring diagram I've copied below from Sourceforge.
EQDIRECT-USB
An EQDIRECT-USB convertor consists of a combined USB serial port that provides TTL outputs. Such a device is avilable from FTDI called the TTL232R, and comes integrated into a USB cble and connector. Please be aware that FTDI produce a similar product, the TTL232R3V3, but due to lower signaling voltages this will not work. A driver is installed on the PC and the TTL232R appears as a standard com port. There is an additional advantage in that unlike many usb-serial devices the com port number of the FTDI device, once assigned, will not change when plugged into a different physical USB port.
To create the EQDIRECT-USB all theat is needed is to connect a 9 way "D" type plug to the flying lead of the TTL232R. The connections are as follows:
Solder Pin 6 of the 9 way D-type Plug to the Orange wire.
Solder Pin 9 of the 9 way D-type Plug to the Yellow wire.
Solder Pins 4 & 5 of the 9 way D-type Plug to the Black wire.
After all this, you can then install and use EQMOD to control the scope from computer
Hope this clears it up.
cheers
Gary