Xerox 7120 - General Description; Introduction

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 faci I iti es provide for detec-
tion of "not operational" conditions by the controlling sys-
tem. Empty input hopper and
full output stacker conditions
are also signaled to the controlling system.
Table 1. Characteristics
Operati ng Characteristi cs
Model 7120 Models 7121/7122 Model 7140
Readi ng speed 400 cards/minute 400 cards/minute (7122) 1500 cards/mi nute
200 cards/minute (7121)
Hopper
capacity 1200 cards
1200 cards
2500 cards
Stacker capacity
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, si ng Ie-phase,
60 Hz, single-phase
60 Hz, single-phase,
2 amps
8 amps
16 amps
Operati ng temperature
60
0
F to 90
0
F
60
0
F to 90
0
F
60°F to 90
0
F
Operating humidity (relative)
25% to 80%
25% to 80%
25% to 80%
General Description
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