A Mini-DIN 8 pin lead* of not more than 2 metres in length is needed for each unit to be synchronised to the master unit.
Available to order from your dealer or local Allen & Heath distributor
part code - description
AH9556 - CABLE DIN MINI8P-MINI8P 1.5M
For further assistance please contact your dealer or local distributor
* Please note: version 1 of the user guide had a typographical error on p.15 and quoted this lead as being 9 pin