Xerox 7120 - Page 15

Table 6. Device Status Response for 510, no, and HIO
Bit
Position
Function
State
Meaning
0
Interrupt Pending
1
Interrupt is pending (that is,
issued but
not yet acknowledged
by an AIO instruction).
A new order wi II not be accepted
until the interrupt is cleared by an AIO or HIO instruction
or by manual intervention (I/O reset from computer control
panel).
Command chaining,
if specified, will initiate a
new
read card cycle even though an interrupt may be
pending.
1,2
Device Condition
A combination of these two bits indicates the current reader
condition.
00
Card Reader Ready.
o 1
Card Reader Not Operational - manual
intervention
re-
quired to clear "not operational" condition.
1 0
Device Unavailable - not applicable.
1 1
Card Reader Busy.
3
Mode
0
Card reader in "manual"
mode (manual intervention
I
requi red).
1 Card reader in "automatic"
mode.
4
Unusual End
1
Execution of previous order terminated due to abnormal
condition, as listed under "Unusual End Conditions".
(Xerox 530 and Sigma 2/3 do not signal
"unusual end"
when an invalid EBCDIC punch is detected.)
5,6 Controller Condition
Same configurations as bits 1,2.
7
Reserved
0
This bit is currently zero; however,
it may be used in future
enhancements.
Table 7. Device Status Response for TDV
Bit
Position Function
State Meaning
0 Data Overrun
1
Data overrun occurred since previous order received by card
reader.
1
Validity Error
1
Va I i di ty error occurred since previ ous order recei ved by
card reader.
2 Read Verify Error (Model 7140)
1
Read verify error occurred since last order issued by control-
ling system.
3-7
Reserved 0
These bits are currently zeros; however, they may be used in
future enhancements.
Card Reader Status Response 9
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