LeCroy 3420 16-ch Constant Fraction Discriminator
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 CAMAC FUNCTION CODES
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 F(0)·A(0-15)  :  8 bits - Read THRESHOLD; channel = 0 - 15.
 F(1)·A(0)     : 16 bits - Read MASK Register on R1 - R16; 0 = Mask Off; 1 = Mask On.
 F(1)·A(1)     :  8 bits - Read DEAD TIME (bits 0 - 3) & WIDTH (bits 4 - 7).
 F(1)·A(2)     :  8 bits - Read TIME-TO-CHARGE-SCALE.

 F(16)·A(0-15) :  8 bits - Write THRESHOLD; channel 0 -15; 0 = 0 V, FF = -1.4 V.
 F(17)·A(0)    : 16 bits - Write MASK Register on W1 - W16; 0 = Mask Off; 1 = Mask On.
 F(17)·A(1)    :  8 bits - Write DEAD TIME (bits 0 - 3) & WIDTH (bits 4 - 7) 16 steps;
                           (0000 = minimum; 1111 = maximum).
 F(17)·A(2)    :  8 bits - Write TIME-TO-CHARGE-SCALE; (0 to - 10 mA).

 F(25)·A(0)    :     n/a - Generate a TEST PULSE. 



 CAMAC COMMANDS
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 X :  An X response is generated when a valid N, A, F command is recognized.
 Q :  A Q response is generated only if the requested function can be executed.
 Z :  Clears mask register at S2 time.