Xerox WORKCENTRE 7120 Reference Manual - Page 10

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Xerox WORKCENTRE 7120 Reference Manual
3.
The Read order specified error stacking and a read
verify error (Model 7140-02) has occurred, in which
case the card is directed to the alternate stacker and
the controlling system is notified of the error with the
read verify error indicator.
4.
The Read order selected an alternate stacker uncondi-
tionay
for this card, in which case the card is directed
to the se
I
ected stacker. t
t
For Model 7120, alternate stacker 1 or 2; for Model 7140,
alternate stacker or normal stacker.
The photoelectric circuitry is automatically checked at the
beginning of each card read cycle. If this check indicates
a malfunction, the card reader switches to the "not opera-
tional" state, I ights the FAULT (Model 7120) or READ
(Models 7121/7122/7140) indicator, and signals "unusual
end
ll
to the controlling system.
If no IIfault
ll
or other condition caused the card reader to
swi tch to the
II
not operati ona
I"
state or the
II
manua III mode,
the card reader either returns to the
II
read/I conditionor(if
command chaining has been specified by the controlling
system) requests a new Read order to read the next card.
Note that each read card cycle requires a Read order.
Table 2. Card Reader State Transitions
~
Present State
Ready Manual
Busy Manual
Ready Automatic
Busy Automati c
Not Operational
Operational
Not possible
Not possible
Not possible
Ready Manual
SIO accepted
START switch operated
Not possible
---
with no operator inter-
vention required
Busy Manual
• HIO received
Not possible
ST ART switch operated
• RESET switch operated
---
with no operator inter-
• I/O reset
vention required
• Invalid order
Ready Automati c
STOP or RESET switch
Not possible
SIO accepted
operated
---
Busy Automatic
• STOP switch operated
STOP switch operated
• Operation completed
• RESET switch operated
and card cycle com-
and no operator inter-
• Execution completed
pleted but order pend-
venti on required
---
and no order pending
ing, or operator inter-
• HIO received
and operator inter-
vention required
• I/O reset
vention required
• Inval id order
4
Data Transfer