Use the USB to I/O port cable for spectrum ST4 to connect your spectrum to Dragonframe desktop software. This is a USB to a serial 3/32 TRS that goes from your mac or PC's USB port to the i/o port on spectrum. This cable allows spectrum to be controlled by dragonframe desktop software. This cable is a general purpose USB to Serial cable. Besides DragonFrame connections, it will allow developers to control the spectrum using the spectrum's API. The API is a work in progress. Reach out to firstname.lastname@example.org to gain access.
Usage note, this cable is particularly sensitive to static. Do not touch the open leads as it can damage or destroy the cable. We now bundle this in packages of two. We recommend you always have a backup cable.