Felston HD940 Owner's Manual page 30

and the flashes of the LED you will see when a HD940 is
put into Cascade Mode
REMOTE CONTROL RECEPTION IN CASCADE MODE:
So that the HD940's operate reliably and synchronized with
each other, they should all be located close together and
facing the same direction, so that their remote control IR
receivers all get signals from the remote control whenever
you press a button. If for some reason you need to locate
the HD940's apart from each other then you can use a
third-party IR repeater to route the infrared signals from
your remote control to the HD940's.
Cascade Mode Configuration Table
HD940
Switch 1
Switch 2
Switch 3
Switch 4
Switch 5
Switch 6
Switch 7
*This button is only available when using a suitably programmed
third-party learning remote control (not supplied).
Operating in Cascade Mode
Your HD940's are now in Cascade Mode and can be controlled
together by your suitably-programmed learning remote control.
The units work as a single entity, routing your AV signals from
source to your TV/AV receiver as required when you select one
of the inputs.
Input Button
To Press
A
E
H*
K*
N*
Q*
T*
Input LED Flashes
A and D flash 3 times
B and D flash 4 times
C and D flash 5 times
A and D flash 6 times
B and D flash 7 times
C and D flash 8 times
A and D flash 9 times