Yamaha DS2416 - Manual (Page 9)

Connections
7
DS2416—Owner’s Manual
Internal
A SI (Serial In) connector
When two DS2416 cards are installed, this connector is connected to the “SO”
connector on the other card using the supplied 14-pin to 16-pin cable. Sound
cards that support the DS2416 can be connected directly to the mixer’s sub
inputs via this connector.
B SO (Serial Out) connector
When two DS2416 cards are installed, this connector is connected to the “SI”
connector on the other card using the supplied 14-pin to 16-pin cable.
C IO-A connector
This connector connects to the first optional AX44 Audio Expansion Unit.
D IO-B connector
This connector connects to the second optional AX44 Audio Expansion Unit.
I O A B
1 2 3 4
SI SO
IO-A
IO-B