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There  are  two  main  operating  modes  for  your  blackbox,  Run Mode  and 
Program Mode. There is also a Test Mode, used for checking the set-up. All 
modes are now described. 
Run Mode 
This mode is used once the blackbox has been set up in program mode. It is 
also the default mode that the unit reverts to when it resumes operation after 
a power failure. 
When the blackbox is switched on for the first time, it will provide an output 
proportional to the distance from the transducer to the target, in feet. All relays 
by default are switched off.  
If  either  the  PC  Programming  Software  (standard)  or  the  Hand-Held 
Calibrator (optional), are connected to the blackbox, via the RS232 interface, 
while the blackbox is in the RUN mode then the current measurement will be 
displayed, dependent on mode and measurement unit's chosen. Models fitted 
with  the  optional  LCD  display  and  integral  keypad  will  also  display  the 
current measurement, dependent on mode and measurement unit's chosen. 
After programming is complete, any relays that are set will operate when the 
measurement reaches the relevant setpoint.