The 510 and 520 communicate with all the modules in the e53 where the 530 has some that it can't read/reply to....



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"When the Team Chief said.... You're trapped in a hole with nothing but a goat and a slinky, what do you do? Stubby said, I'm not sure but it won't end well for the goat...." ~(Overheard) Last day, Phase 3, Q Course