Xerox WORKCENTRE 7120 User manual

Xerox Card Readers
Models 7120171211712217140
Reference Manual
900970E

Code
(Hexadecimal)
02
06
12
16
32
36
OA
OE
1A
1E
3A
3E
CARD READER ORDER CODES
Function
Read Binary
Read Automatic
Read Binary
Read Automatic
Read Binary
Read Automatic
Read Binary
Read Automatic
Read Binary
Read· Automatic
Read Binary
Read Automatic
Model 7120
Normal stocker
Normal
stocker
Stocking Action
t
AI ternate stocker 1
AI ternate stocker 1
Alternate stocker 2
Alternate stocker 2
If no data overrun occurs, stock
cord in normal
stocker; if data
overrun occurs, stock cord in
alternate stocker 2.
If neither data overrun nor
validity error occurs, stock
cord in normal
stocker; if data
overrun or validity error occurs,
stock cord in
alternate stocker 2.
If no data overrun occurs, stock
cord in
alternate stocker 1; if
data overrun occurs, stock cord
in
alternate stocker 2.
If neither data overrun nor
validity error occurs, stock
cord in
alternate stocker 1; if
data overrun or validity error
occurs, stock cord in
alternate
stocker 2.
Alternate stocker 2
Alternate stocker 2
Model 7140
Normal
stocker
Normal stocker
AI ternate stocker
Alternate stocker
Normal stocker
Normal
stocker
If neither data overrun nor read
verify error occurs, stock cord
in normal stocker;
if error occurs,
stock cord in
alternate stocker.
If neither data overrun, validity,
nor read verify error occurs,
occurs, stock cord in normal
stocker; if data overrun, validity,
or read verify error occurs, stock
cord in
alternate stocker.
Alternate stocker
Alternate stocker
Some as 'OA
'
Some as 'OE
'
tModels 7121/7122 accept all the above order codes but offer no alternative stocking since they have one stocker.

Xerox Corporation
701 South Aviation Boulevard
EI Segundo, California 90245
~13 679-4511
Xerox Card Readers
Models 7120/7121/7122/7140
Reference Manual
90 09 70E
November 1970
Price: $1.00
XEROX
Printed in U.S.A.

ii
REVISION
This publication, 9009 70E, is a revision of the Xerox Sigma Card Readers Reference Manual, 9009 700 (dated
May, 1970). A
change in text from that in the previous manual is indicated by a vertical line in the margin of the
affected page.
RELATED PUBLICATIONS
Title Publication No.
Xerox 530 Computer/Reference Manual 90
19 60
Xerox Sigma 2 Computer/Reference Manual
900964
Xerox Sigma 3 Computer/Reference ManuaI 90
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Xerox Sigma 5 Computer/Reference Manual 900959
Xerox Sigma 6 Computer/Reference Manual 90 17
13
Xerox Sigma 7 Computer/Reference Manual 900950
Xerox Sigma 8 Computer/Reference Manual 90 1749
Xerox Sigma 9 Computer/Reference Manual 90 1733
Xerox Meta-Symbol/LN, OPS Reference Manual (Sigma 5-9) 900952
Xerox Symbol/LN,OPS Reference Manual (Sigma 5-9)
90 1790
Xerox Macro-Symbol/LN, OPS Reference Manual (Sigma 5-9)
90 15 78
Xerox Symbol/LN,OPS Reference Manual (Xerox 530 and Sigma 2/3) 90 1051
Xerox Extended Symbol/LN, OPS Reference Manual (Xerox 530 and Sigma 2/3) 90 1052
Manual Content Codes: BP -batch processing, LN -language, OPS -operations, RBP -remote batch processing,
RT - real-time, SM -system management, TS -time-sharing, UT -utilities.
ALL SPECIFICATIONS SUBJECT TO CHANGE WITHOUT NOTICE

CONTENTS
l.
GENERAL DESCRIPTION
Card File Unloading Procedure
(Models 7121/7122) 19
Introduction
Reader Halted
19
Reader Running 19
2.
FUNCTIONAL DESCRIPTION 2 Card
File Loading Procedure (Model 7140) 19
Reader HaI ted
19
Data Representation 2 Reader Running 19
EBCDIC Card Format 2 Card
File Unloading Procedure (Model 7140) __ 19
Binary Card Format 2 Reader
Halted
19
Card Reader States 3 Reader
Runn ing 19
Operational States 3
Conditions 3
APPENDIXES
Modes 3
Transitions Between States
3
A.
XEROX EBCDIC CARD CODES 20
Data Transfer 3 B.
PROGRAMMING EXAMPLES 22
3. PROGRAM INTERFACE 5 Sigma
5-9 Programming Example
22
Read Orders
5 Xerox 530
and Sigma 2/3 Programming Example_ 23
Read Card Binary 5
Read Card Automatic 6
ILLUSTRATIONS
Key Events 6
Start Input/Output
6 Model 7120
Card Reader, Model 7140 Card
Unusual End Conditions
6 Reader, Model 7121/7122
Card Reader
iv
Channel End Conditions 6
Error Conditions
7 1. EBCDIC Read
Operation
2
Incorrect Length 7
2.
Binary Read Operation
2
Invalid EBCDIC Punches 7
Data Overrun
7
3.
ControlIing System/Card Reader Actions
11
Read Verify (Model 7140-02) 7
4.
Card Reader Event Times (Model 7120)
12
Not Operational Conditions
7
Card Reader Status Response 7
5.
Card Reader Event Times (Model 7121)
13
I/O Instruction Status Bits 7
6.
Card Reader Event Times (Model 7122) 14
Device Status Byte 7
Operational Status Byte 9
7.
Card Reader Event Times (Model 7140)
15
Programming Consi dera tions 9
8.
Model 7120 Card Reader Control Panel
16
Sequence of Activity
9
Timing Information 9
9.
Models 7121/7122 Card Reader Control Panel
16
4.
OPERATIONS
16
10. Model 7140 Card Reader Control Panel 17
1l.
Model 7120 Input Hopper
18
Introduction
16
12.
Model 7120 Multiple Output Stackers
18
Operator Controls (Model 7120)
16
OPER' L/POWER
16
13.
Models 7121/7122 Input Hopper and Output
START
16
Stacker
18
FAUL T/RESET
16
14.
Model 7140 Input Hopper and Output Stackers __ 19
STOP
16
Operator Controls (Models 7121/7122/7140) __ 16
TABLES
POWER
16
START
16
STOP 17 1.
Characteristics
1
FEED/READ 17
2.
Card Reader State Transitions 4
RESET
17
3.
Binary Mode Stacking Action
5
HOPPER/STACKER 17
4.
Automatic Mode Stacking Action
6
Card File Loading Procedure (Model 7120) 17
5.
Card Reader I/O Instruction Execution Response_
8
Card File Unloading Procedure (Model 7120) __ 18
6.
Device Status Response for SIO, TIO, and HIO_
9
Card File Loading Procedure (Models 7121/7122)_ 18
7.
Device Status Response for TDV
9
Reader Ha I ted
18
8.
Device Status Response for AIO
10
Reader Running
18
9.
Operational Status Byte 10
iii

Model 7120 Card Reader
Model 7140 Card Reader
Model 712117122 Card Reader
iv

1. GENERAL DESCRIPTION
INTRODUCTION
Xerox Models 7120/7121/7122/7140 Card Readers are
capable of reading standard 80-column tabulating cards
conforming to the Electronic Industries Association (EIA)
punched card standard RS-292.
Cards are read serially, column by column, in either of
two read modes: binary (absolute) or
automatic (EBCDIC).
Automatic
read mode switching, from EBCDIC to binary,
facilitates reading of intermixed EBCDIC- and binary-
punched cards.
The photoelectric read station reads each 12-bit column of
an 80-column card. The data thus sensed are presented to
the controlling system as a series of 8-bit bytes.
Transport check and read check facilities provide for detec-
tion of IInot operational
ll
conditions by the controlling sys-
tem. Empty input hopper and full output stacker conditions
are also signaled to the controlling system.
Table 1. Characteristics
Operating Characteristics
Model 7120 Models 7121/7122
Model 7140
Readi ng speed 400 cards/minute
400 cards/minute (7122) 1500
cards/minute
200 cards/minute (7121)
Hopper capacity
1200 cards 1200 cards 2500 cards
Stacker capaci ty 1000 cards/stacker
1000 cards 2000
cards/stacker
Number of stackers 3 1 2
Physical Dimensions
Height
24 in.
17 in. 40 in.
Width 32 in.
21 in.
37.5 in.
Depth 25
in.
31.5 in.
33 in.
Weight (approximately) 450 Ib
200lb 350lb
Recommended access area
3 ft on all sides 3
ft on all sides 3 ft on
all sides
Environmental Characteristics
Power Requirements 120 vac,
120 vac,
120 vac,
60 Hz, single-phase,
60 Hz, single-phase
60 Hz, single-phase,
2 amps 8 amps 16 amps
Operating temperature
60
0F to 900F 600F to
90
0F 600F
to 900F
Operating humidity {relative} 25% to 80% 25% to 80% 25% to 80%
General Description

2. FUNCTIONAL DEoSCRIPTION·
DATA REPRESENTATION
A single 80-column card can contain data in either of two
formats: EBCDIC
or binary.
EBCDIC CARD FORMAT
In the EBCDIC card format there are 256 valid punch con-
figurations for a single card column (see Appendix A), each
of whi ch is translated into an 8-bit code in the range 0-
25510(0016-FF16). Thus, the EBCDIC card image (i.e.,
the 80 columns of punch configurations) consists of a trans-
lated string of 8-bit bytes, with the first byte of the string
corresponding to the
configuration punched in column 1 and
the last byte of the translated string corresponding to col-
umn 80. , The card image is always presented to the control-
ling system in column order.
Figure 1 illustrates how the first two columns of an EBCDIC
card image are presented to the controlling system. Note
that column 2 contains an invalid EBCDIC punch configura-
tion, which is translated as 8 zeros and which causesa trans-
mission data error condition (see IErrorConditions" in Chapter
3). If column 1 of a card contains punches in rows 1 and 2,
the entire card is interpreted as a binary card image rather
than an EBCDIC image (see IIRead Orders" in Chapter 3).
Column
Byte
II
)
000000000
12345118 B
1111111111
2122222222
3333333333 \
444444444
555555555
6666666661
777777777
8888888888
9999999999 }
1 2 3 ~ 5 6 1 8 9 10
~I
l
n+1
n
, , fA,
Data 11 1 00 0001 1. 0000 0000 I
Bit Position 0 1 2 314 5 6 710 1 2 314 5 6 7
Validity
Valid
Invalid
Figure 1. EBCDIC Read Operation
2 Functional Description
BINARY CARD FORMAT
In the binary card format there are 4096 possible punch con-
figurations for a single card column, and all configurations
are valid. In this format each card column corresponds toa
12-bit code in the range 0-4095 (00016-FFF16)' with each
row punch corresponding to a 1 in the 12-bit code. Thus,
the binary card image consists of a string of 80 12-bit codes,
with the first code corresponding to the actual punch con-
figuration in column 1 and the last code corresponding to
the actual punch configuration in column 80. Because
Sigma I/O systems use an8-bitbyte as the basic data group-
ing, the 80 12-bit codes are presented to the controlIing
system as 120
8-bit bytes.
Figure 2 illustrates how the first twocolumnsof a binary card
image are presented to the controll ing system. Note that
for odd-numbered columns, the data in rows 12 through 5
comprise
one byte and that the data in rows 6 through 9 are
combined with the data in rows 12 through 1 of the next
even-numbered column to form a second byte. A third byte
is formed from the data in rows 2 through 9 of the even-
numbered column. Thus, for each odd- even-numbered
pa ir of binary card columns, the controll ingsystem receives
a sequence of three 8-bit bytes.
Card
Row
Column
Byte
Data
I
123456 )
1111111
2122222.
61666666L
rF
777777777
IF
818888888
123'; 5 6) 8 9
~
I
999999999
12 11 0 1 2 3 4 5.6 7 8 9 12 11 i 0 1 12 3 4 5 6 7 8 9
~~ ______ T~ ___ I __ ~J ~~----~:~T,-------JI
n
:It
n+l
*
I 2
n+2
*
Bit Pos ition 'o-;--;-:;-tT-<"'"i:"--;-irn-,-:;-:;-i~;--;---:;4-;;--;;--::--:::-t...,......,~...".J
Figure 2. Binary Read Operation
The binary card image is always presented to the controlling
system in column order and in the byte sequence described
above.

CARD READER STATES
The initial state of the card reader depends on its power
status. The complete absence of power to the card reader
subsystem (that is, the absence of its prime ac power and
system dc power) effectively removes the card reader from
the controlling system. All attempts to access the card
reader result in a response of "no input/output address rec-
ognition" to the I/O instructions. Furthermore, unpredictable
status conditions are supplied if status response is requested
by the I/O instruction. In the absence of ac power, the
presence of system dc power will enable address recognition,
but the card reader assumes a "not operational" state. Like-
wise, failure of power supplies internal to the card reader
causes the card reader to assume a "not operational" state.
OPERATIONAL STATES
The presence of ac and dc power, with no read station faul t
or transport mechanism
fault, enables the card reader to as-
sume either of two device conditions ("ready" or "busy")
and either of two modes ("manual" or lI
au
tomatic"). A read
station fault exists if one or more of the photoelectric
channels for sensing punches in the card rows have fai led to
pass the read
station test in the previous card read operation.
A transport mechan ism faul t exists if a card jam exists in any
portion of the card transport area.
The exact condition and mode status of the card reader at
any given time is returned to the controlIing system in re-
sponse to such I/O instructions as 510, HIO, and TIO.
Other I/O instructions, such as AIO and TDV, provide more
specific indications of the card reader's status (see IIStatus
Response" in Chapter 3). A brief explanation of the possible
conditions and modes of the card reader follows.
CONDITIONS
Ready. In the II ready II condition the card reader is capable
of accepting an SIO instruction, providing no device inter-
rupt is pending. In order to be in the "ready" condition,
the card reader must be operational (that is, all conditions
defined under "Operational States" must be satisfied) and
the execution of an order to read a card is not in progress
or
pending.
Busy. In this condition the card reader has accepted an SIO
instruction. The unit will not accept a new SIO until the
current order Iist is completed and no device interrupt is
. pending.
MODES
Manual. The card reader assumes the "manual" mode when
any condition arises requiring operator intervention before
the reader can function normally (e. g., stacker full, hop-
per empty, etc.). The "manual" mode is forced by the
operator pressing the STOP switch or RESET switch on
the card reader control panel. The reader can accept an
.
SIO instruction in this mode, but will not act on it in any
way until it enters the "automatic" mode.
Automatic. When all necessary conditions for successful
card reader operation are present, the reader is placed in
the "automatic" mode by the operator pressing the START
switch on the card reader control panel (thus illuminating
the switch).
TRANSITION BETWEEN STATES
The allowable card reader state transitions and the condi-
tions causing the reader to change from one state to another
are summarized in Table 2.
DATA TRANSFER
A card read operation is initiated by the controlling system
with a START INPUT/OUTPUT (510) instruction if all the
following conditions are satisfied:
1. Input/output address recognition exists.
2. The card reader is in the 1\ ready" condition.
3. No interrupt is pending.
If the card reader is in the "automatic II mode, it then requests
an order from the controlIing system. After accepting a read
order, the card reader advances a card from the input hop-
per to the read station, and commences to read the card,
column by column, beginning with column 1. If reading is
performed in the EBCDIC mode, one 8-bit byte is transmitted
to the controlIing system for each col umn read, and a code
validity check is performed on each byte. In the binary
read mode three 8-bit bytes are transmitted to the controlIing
system for
each odd-even-numbered pair of col umns (no
val idity check is performed in this mode). Reading continues
until one of the following conditions occurs:
1. The end of the card is detected.
2. The card reader receives a II count done" or "halt" sig-
nal from the controlling system.
3. A "fault" condition is encountered.
If the card read operation was not terminated by a card jam,
the card is then routed to the stacker station, where it is
sensed and directed to the normal stacker unless:
1. The Read Automatic order specified error stacking and
the validity check (for EBCDIC mode only) indicated
that the card contained an invalid EBCDIC punch con-
figuration, in which case the card is directed to al ter-
nate stacker 2 (Model 7120) or to the alternate stacker
(Model 7140).
2. The Read orderspecified error stacking and a data over-
fUn has occurred, in which case the card is directed to
al
ternate stacker 2 (Model 7120) or the alternate stacker
(Model 7140) and the controlIing system is notified of
the error with the Data Overrun and Unusual End
indicators•
Card Reader
States/Data Transfer 3

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-
tionay for this card, in which case the card is directed
to the se I ected stacker. t
tFor 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, Iights 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 Automatic
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 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- 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