Burst Electronics AS4x1 - Manual (Page 7)

5 AS4x1 Audio Switch
Audio/Video Switching
To switch both audio and video, use a AS4x1R Four-
Channel Audio Switcher and a VS4x1R Four-Channel
Video Switcher. These two units can be linked together via
RS232. With the two units linked, audio follows video and
audio breakaway is possible.
Interconnect the RS232 ports of the AS4x1R and VS4x1R
using a “Stereo Patch Cable” with 3.5 mm stereo plugs on
each end. An example is a Radio Shack 42-2387. See the
VS4x1 manual for more details.