Hi,
It sounds like you know what you are doing but it may be worth checking the following:
The desk requires a power supply feed from the dimmer. This is fed back along the control cable (on pin 7 of the 8-pib DIN connector). This is usually +20V. If the Level 12 has come from an installation that uses e.g. Strand dimmers which use negative voltage signalling, it may have had an inverter kit fitted in which case it will require a -20V supply.
The Betapacks can be set to provide either +20V or -20V. In the Betapack1 this is a link on the PCB behind the back cover. For a Betapack2 this is a small switch on the front of the dimmer next to the 8-pin DIN socket (maybe behind a grey panel fixed with a screw). Manuals for both products are still available from the Zero88 website.
In both cases there will be an LED on the front of the dimmer. If it is red then the dimmer is supplying +20V. If it is green then -20V. Check your Betapack1 and Betapack2 are showing the same colour - you should do this by turning on the dimmers _without_ the control cables connected.
You should then connect the control cable from say you Betapack1 dimmer to the desk (say Ch1-6). Turn on the dimmer and see if the LED on the front of the Level 12 comes on. Repeat this with only the Betapack2. Then again with the control cable plugged into Ch7-12 of the Level 12. Repeat with the Betapack1.
If in any of the combinations above the desk LED does not light, then the dimmer is providing the wrong polarity of voltage. Move the link or flick the switch on the dimmer as I have indicated above.
If the Level 12 has an inverter module fitted to only one set of channels then it may be that you have to set one of your dimmers to +20V and one to -20V. Note that the desk is then using +10V signalling on one set and -10V on the other set. However both types of Betapack will autosense the control voltage polarity from the desk and work automatically.
If you do ascertain that the Level 12 does have an inverter module then any user of the desk/dimmer combination will need to make sure they always connect the dimmers to the desk in the correct association. Alternatively you could remove the inverter kit, set both dimmers to +20V and plug and play any way round you want.
Hope this helps.
