John Dorighi's response in the following is how I have set up my program (using slot 1 being the main difference).
However, the 8163B does not respond to the SME hardware triggers from the Santec TLS, the logging never completes (repeatedly states logging. The same code works for a different manufacturer's optical power meter, so I know the calculations are correct and the tunable laser is sending out triggers.
I've tried on 2 different mainframes and power meters, all devices have the latest firmware.
I don't have the TRIG 1 command as John has in his code, but if I include the command it makes no difference in the outcome.
SENS1:CHAN1:POW:RANG -10.000 DBM