Lindy 32364 - Manual (Page 19)

LINDY Dual/Quad PRO Installation and Use Page 18
If you are making multiple cascade links between LINDY Dual/Quad PRO then
ensure that the cables are approximately the same length.
LINDY Dual/Quad PRO devices may be cascaded to cascades but the Pro units
must always be on the lowest level of the cascade (in other words you must not
cascade an device off a Pro device)
LINDY Dual/Quad PRO 4, 8, 12 and 16 models may be cascaded together.
You must choose groups of cascade ports from the following table. When you
cascade using a group of ports the system will allocate the first available free port in
that group (see section 4.10 and 4.16 for more details)
The following diagrams show some typical LINDY Dual/Quad PRO installations.