6-2
subtracts it to the existing power value.
The control microcontroller reads and controls
power change requests, however the monitor
microcontroller also looks at the encoders to verify
the change is valid. If the two microcontrollers
disagree on the direction (up or down), number
of counts, or which encoder is rotating, the power
will not be changed; i.e. the change request is
ignored.
6.2.4 Activation Requests [U16 & U33]
Activation requests are “looked at” by both micro
-
controllers, and if the two do not agree on an acti
-
vation request, an error code (Err 303 or Err 307)
will be displayed.
Activation Requests: Handcontrol or
Footcontrol
H2CT Handcontrol 2, Cut, Active Low
H2CG Handcontrol 2, Coag, Active Low
H1CT Handcontrol 1, Cut, Active Low
H1CG Handcontrol 1, Coag, Active Low
HIP Handcontrol, Bipolar, Active Low
FCT Footcontrol, Cut, Active High
FCG Footcontrol, Coag, Active High
FBIP Footcontrol, Bipolar, Active High
FAB Footcontrol, ABC™, Active High
Note: HABC Handcontrol is activated at
handcontrol 2 and is a result of H2CT * H2CG *
HABC_DR, which is an output of U16.
6.2.5 Mode Select Encoders [U31 & U32]
Blend Level (BL) and Argon Flow (FL) rate is
adjusted by the same type of encoders as used for
power adjustments. The logic within U31 & U32
for these two encoders is the same as for power
adjustment and the discussion for power adjust
-
ment applies here.
These logic devices have I/O ports also, and the
following text provides a brief description of each
port signal.
U31: Port B (PB0 - PB7) Inputs for Control
Microcontroller
LPSW: Low Pressure Switch
SET when the argon tank pressure is less than
240 psi. Low Tank warning is illuminated.
FDEV: Flow Deviance
SET if an occlusion occurs to the argon flow.
A_T: Active Mode or Target Mode
ABC™ mode and used for tone selection only.
A_T SET, tone is 500 Hz and ABC™ is active
- A_T CLEARED, tone is 250 Hz and
ABC™ is in the Target mode.
BRN_OUT: Brown Out
Holds high for at least 6 seconds when power
fails and is used to identify a temporary power
loss. The user settings are returned following
a temporary power loss.
Tone_A: Tone Signal
Mode Activation and Alarms. Square wave sig
-
nal with frequency between 250 Hz to 1KHz
for audible tone.
KB_DA: Keyboard Data Available
SET when a front panel switch is pressed, cleared
when the device is read.
U31: Port C (PC0 - PC6) Outputs from
Control Microcontroller
ABC>80: ABC™ Power is Greater than 80W
SET when ABC™ power is set to greater than
80W.
CLEARED when ABC™ power is 80W
or less.
RFEN: RF Enable
SET to enable the RF drive for all activations.
FB_EN: Full Bridge Enable
CLEARED when activation for Cut, Blend,
Pinpoint, & Bipolar occurs.
OV_TST: Over Voltage Test
Test pin that allows the control microcontroller
to test and verify the ABC™ over voltage
circuit is operational. During Power-On Self-
Test (POST), this signal is clocked for a dura
-
tion of about 7mS.
Alarm: Tone for alarms
1KHz signal tone for alarm - volume cannot be
adjusted.
Tone_B: Tone, Mode
Signal for all Tones except alarm tones. Volume
can be adjusted.
U32: Port B (PB0 - PB7) Monitor Inputs
This port has the switch for setting the system
defaults. The switch is located on the back side of
the Display PCB for accessibility. Default settings
are with the switch in the “OFF” position (off
= high on the input pin of U32). To change a
default setting, move the appropriate switch to the
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