Triax 492090 User Manual page 16

Connecting units
If you only connect one subunit to the main unit, you pull a cable from the
"unit link 1" socket on the main unit to the "unit link 1" socket on the subunit.
To connect two subunits to the main unit, you pull a cable from the "unit link
1" socket on the main unit to the "unit link 1" socket on subunit 1.
Then you pull a cable from "unit link 2" socket on the main unit to the "unit
link 1" socket on subunit 2.
Next you connect the first subunit to the second subunit using the "unit link
2" sockets on subunits 1 and 2.
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