I toggled to 'temperature controller', and adjusted the set value (SV) to 214
degrees. I also pressed and held the > arrow key on the controller, which
tells the controller to 'learn' how the thermocouple and heating element
work together (it's this step that many people DON'T do). 

I then watched as the controller turned on the heating element (the power
indicator light at the bottom of the smoke box turned on) and watched the temperature climb. After about 1/2 hour, the controller indicated that the box was at 214 degrees (verified by the thermometer on the front of the unit) -- success!

FURTHER exploration...

Cold Smoking is ideal for all of the salmon and trout that we have here in the
Pacific Northwest -- but when the air temperature is above 50 degrees, it's hard
for the smoke box not to rise above 80 degrees just because of the charring
of the puck.  The TET-612 unit has a feature that can be used to set the TET-612's relay output for temperatures inside or outside of a temperature range.

I'm considering using one of the relay outputs to TURN OFF the bisquette heater
if the temperature of the box goes above 78 degrees, to be able to cold smoke
on cool days.  One more relay (115v coil) and one more toggle switch should
be all that I need to hook it into the bisquette heater/advance circuit.