The ADAT output connectors operate as follows:

44.1/48kHz sample rates:
Connector 1 = channels 1 to 8 in parallel
Connector 2 = channels 1 to 8 in parallel (identical to connector 1)

88.2/96kHz sample rates:
Connector 1 = channels 1 to 4
Connector 2 = channels 5 to 8

176.4/192kHz sample rates:
Connector 1 = channels 1 and 2
Connector 2 = channels 3 and 4