Xerox 7120 - Card Reader State Transitions

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 con~rolling system is notified of the error with the
read verify error indicator.
4. The Read order selected an alternate stacker uncondi-
tionally for this card, in which case the card is directed
to the selected stacker.
t
t
For Model 7120, alternate stacker 1 or 2; for Model 7140,
a I ternate stacker or norma I 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, lights the FAULT (Model 7120) or READ
(Models 7121/7122/7140) indicator, and signals "unusual
end" to the
controlling system.
If no "fault" or other condition caused the card reader to
switch to
the "not operational" state or the "manual" mode,
the card
reader either returns to the "ready" 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 possibl e
Ready Manual
SIO accepted
ST ART 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 Automatic
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-
vention required
---
and no order pending i ng, or operator inter-
• HIO received
and operator inter-
vention required
• I/O reset
vention required
• Inval id order
4 Data Transfer
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