One supplement to Guy’s suggestion.

Everytime you disconnect a Masterlink cable be sure to power down all connected units in the main room and the link room to avoid the risk of damaging anything.

Also good practice for power up is to get the main room running first, and the the link rooms

I purchased a new RJ45 to Masterlink Cable and the rooms now seem to be communicating.

A problem I had not thought about is that my Mac was connected to A. Aux in on BS9000 in the link room which would play music from my Mac to either or both rooms.  Now it is not and the Airplay units do not seem to be communicating. I have a second cable running from my Mac to an airport express and then ethernet to main room then another AirPort Express to my BS3.

I notice that when I press A. Aux in my link room then the BS9000 now in the main room still comes on to A. Aux. However there is now no direct connection to this machine as there was before when the cable was connected from AirPort Express to A. Aux in on the 9000.

I thought the BS3 would pick up the AirPort Express as I believe it is plugged into it. One problem might be that I don't quite know which button to press to access the AirPort Express. The BS3 is so complicated for me.

Any thoughts.

I am really grateful for the advice I have been given so far as it has solved the main part of my problem. Now just to get this last bit working.

paddy2042

It's great that the new RJ45 to ML cable worked - that was my suspicion because there are many variants out there. With regard to AUX.  The problem could be the BeoLink Active - it needs to have a SW level of 1.5 or higher to respond to the A.AUX command.  Check the label of the Active and see if it has the SW level written on it. Here's an example to show where the SW level is written - you can see it bottom right (SW1.1 in this case):  (click photo to enlarge) Sadly very few of the second hand available Active's are SW1.5 - always look at the label to check. There may well be a 'workaround', but let's check the SW level of your Active first.

Further to the above, here's a SW1.6 Active on UK eBay:  

Thank you for your considered response and taking the time to help.

My ML Active is SW1.6 so I guess this is not the problem.

When the BS9000 was in the link room and the AirPort Express was plugged into it the sound came out of the main system. The Aux of the BS9000 sent the signal to the main room and it all worked. When I press A. Men on the Beo4 I am not sure what is supposed to come on: the Aux on the BS9000 or the Aux on the BC2 or the input on the BS3 - in fact none of them seem to trip and turn on.

A. Mem in both room turns speakers on but no sound, but it also turns on the BS9000 (which I don't think is correct as there is now no Aux connection to the Airport Express.

I have two cables joining my two rooms: One is the Masterlink cable and the other is an ethernet. The signal from my Mac goes through ethernet to an express then this goes trough to the main room via ethernet, then plugs into another AirPort Express which is connected to my main system.

I know this is probably as confusing to you as me. I just hope soon to be able to listen to Computer Music on my system.

Many thanks in hope of a fix.

paddy2042

For this to work, one of your Airport express units should still have a cable form the sound output to the AUX input of the BS9000.

A.MEM should activate the AUX input on the BS9000 which it also sounds like it does.

on the Mac you will have to choose Airplay to the Airport Express that is currently connected to the BS9000

Hope this helps

Yes this is what I had when the BS9000 was in the link room and it worked perfectly. At the moment I have the second AirPort Express connected to the BS3 and / or BC2 (I am actually not sure which). So the Auxiliary input on either the BC2 or the BS3 will not transmit the signal?

 

paddy2042

If you activate the command for the input it is currently connected to on the BS3 it should work.
This will probably be a VIDEO related command, but these can be configured freely so only way to see what command is attached to that input is in the setup menu on the BS3.

 

The way your BC2 is connected it will not be able to share its AUX input with the rest of the system.

 

These are the impulsion BS3

AV1 None

AV2 V. Mem

AV 3 DVD

AV4 V. Aux2

AV 5 None

AV6 Camera

 

I think the input for the Airplay input is AV 4 V. Aux 2. I have added V. Aux2 to the Bio 4 but it does not seem to activate it. I think I must be doing something fundamentally wrong. In my defence though one seems to almost need a PhD to set up the BS3!

Paddy2042

If you still have the cable you used with the BS9000 and it is long enough it might be easier to just connect the airport express to that again.

Also the remote control command A.MEM is easier to acces than V.AUX2