Connect a cable from the Master TSW14xxx SYNC/TRIG_OUT SMA to the Master TSW14xxx EXT_TRIG_INPUT/TRIG_IN SMA. This allows the Master TSW14xxx to register its own trigger output.
Connect another cable from an unused SYNC/TRIG_OUT SMA on the Master to the SLAVE EXT_TRIG_INPUT SMA. This allows the slave TSW14xxx to receive the trigger signal from the Master.
Note:
All SYNC/TRIG_OUT SMAs contain the same signal.
The order does not matter. The cables of each trigger signal should have equal
length to make sure the trigger signal arrives at the same time for all
boards.