[CA] E-80/E-120 interface

I have an E-80 & an E-120. I tried using the proper seatalk HS cables & a seatalk HS crossover connector, I set the E-80 as the data master.
The E-120 is set to data master off. I tried powering up the E-80 first and then when it was fully up, powered up the E-120 I get Data Master Alarm.
Any ideas or solutions?