NI rs232 to usb converter cable; FTDI or PL2303?

Hi,

I am trying to control a pump with a RS232 to USB converter cable by NI (USB-232; 188345C/02) connected to a USB host shield attached to an Arduino UNO. Pump control with the same NI converter cable worked fine with LabView. Could it be I have to use a specific driver, such as FTDI or PL2303 with the Arduino? Does anyone know which chip is on NI's converter cable?

Thanks