Keithley 7020-D, 7020 Instruction Manual

Model 7020 Digital I/O Interface Card

Instruction Manual

A GREATER MEASURE OF CONFIDENCE

Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176 - TestEquipmentDepot.com

W ARRANTY

Keithley Instruments, Inc. warrants this product to be free from defects in material and workmanship for a period of 1 year
from date of shipment.

Keithley Instruments, Inc. warrants the following items for 90 days from the date of shipment: probes, cables, rechargeable
batteries, diskettes, and documentation.

During the warranty period, we will, at our option, either repair or replace any product that proves to be defective.

To exercise this warranty, write or call your local Keithley representative, or contact Keithley headquarters in Cleveland, Ohio.
You will be given prompt assistance and return instructions. Send the product, transportation prepaid, to the indicated service
facility. Repairs will be made and the product returned, transportation prepaid. Repaired or replaced products are warranted for
the balance of the original warranty period, or at least 90 days.

LIMIT A TION OF W ARRANTY

This warranty does not apply to defects resulting from product modification without Keithley’s express written consent, or
misuse of any product or part. This warranty also does not apply to fuses, software, non-rechargeable batteries, damage from
battery leakage, or problems arising from normal wear or failure to follow instructions.

THIS WARRANTY IS IN LIEU OF ALL OTHER WARRANTIES, EXPRESSED OR IMPLIED, INCLUDING ANY
IMPLIED WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR USE. THE REMEDIES PRO­VIDED HEREIN ARE BUYER’S SOLE AND EXCLUSIVE REMEDIES.

NEITHER KEITHLEY INSTRUMENTS, INC. NOR ANY OF ITS EMPLOYEES SHALL BE LIABLE FOR ANY DIRECT,
INDIRECT, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE OF ITS
INSTRUMENTS AND SOFTWARE EVEN IF KEITHLEY INSTRUMENTS, INC., HAS BEEN ADVISED IN ADVANCE
OF THE POSSIBILITY OF SUCH DAMAGES. SUCH EXCLUDED DAMAGES SHALL INCLUDE, BUT ARE NOT LIM­ITED TO: COSTS OF REMOVAL AND INSTALLATION, LOSSES SUSTAINED AS THE RESULT OF INJURY TO ANY
PERSON, OR DAMAGE TO PROPERTY.

Keithley Instruments, Inc.

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4/01

Model 7020 Digital I/O Interface Card

Instruction Manual

©1995, Keithley Instruments, Inc.

All rights reserved.

Cleveland, Ohio, U.S.A.

Second Printing, March 2001

Document Number: 7020-901-01 Rev. B

Manual Print History

The print history shown below lists the printing dates of all Revisions and Addenda created for this manual. The
Revision Level letter increases alphabetically as the manual undergoes subsequent updates. Addenda, which are
released between Revisions, contain important change information that the user should incorporate immediately into
the manual. Addenda are numbered sequentially. When a new Revision is created, all Addenda associated with the
previous Revision of the manual are incorporated into the new Revision of the manual. Each new Revision includes
a revised copy of this print history page.

Revision A (Document Number 7020-901-01)....................................................................................... April 1995

Addendum A (Document Number 7020-901-02)................................................................................... April 1998

Revision B (Document Number 7020-901-01)..................................................................................... March 2001

All Keithley product names are trademarks or registered trademarks of Keithley Instruments, Inc.
Other brand and product names are trademarks or registered trademarks of their respective holders.

Safety Precautions

The following safety precautions should be observed before using
this product and any associated instrumentation. Although some in­struments and accessories would normally be used with non-haz­ardous voltages, there are situations where hazardous conditions
may be present.

This product is intended for use by qualified personnel who recog­nize shock hazards and are familiar with the safety precautions re­quired to avoid possible injury. Read the operating information
carefully before using the product.

The types of product users are:

Responsible body

and maintenance of equipment, for ensuring that the equipment is
operated within its specifications and operating limits, and for en­suring that operators are adequately trained.

Operators

trained in electrical safety procedures and proper use of the instru­ment. They must be protected from electric shock and contact with
hazardous live circuits.

Maintenance personnel

to keep it operating, for example, setting the line voltage or replac­ing consumable materials. Maintenance procedures are described in
the manual. The procedures explicitly state if the operator may per­form them. Otherwise, they should be performed only by service
personnel.

Service personnel

safe installations and repairs of products. Only properly trained ser­vice personnel may perform installation and service procedures.

Keithley products are designed for use with electrical signals that
are rated Installation Category I and Installation Category II, as de­scribed in the International Electrotechnical Commission (IEC)
Standard IEC 60664. Most measurement, control, and data I/O sig­nals are Installation Category I and must not be directly connected
to mains voltage or to voltage sources with high transient over-volt­ages. Installation Category II connections require protection for
high transient over-voltages often associated with local AC mains
connections. The user should assume all measurement, control, and
data I/O connections are for connection to Category I sources un­less otherwise marked or described in the Manual.

is the individual or group responsible for the use

use the product for its intended function. They must be

perform routine procedures on the product

are trained to work on live circuits, and perform

Exercise extreme caution when a shock hazard is present. Lethal
voltage may be present on cable connector jacks or test fixtures.The
American National Standards Institute (ANSI) states that a shock
hazard exists when voltage levels greater than 30V RMS, 42.4V
peak, or 60VDC are present.

that hazardous voltage is present in any unknown circuit before
measuring.

Users of this product must be protected from electric shock at all
times. The responsible body must ensure that users are prevented
access and/or insulated from every connection point. In some cases,
connections must be exposed to potential human contact. Product
users in these circumstances must be trained to protect themselves
from the risk of electric shock. If the circuit is capable of operating
at or above 1000 volts,

exposed.

Do not connect switching cards directly to unlimited power circuits.
They are intended to be used with impedance limited sources.
NEVER connect switching cards directly to AC mains. When con­necting sources to switching cards, install protective devices to lim­it fault current and voltage to the card.

Before operating an instrument, make sure the line cord is connect­ed to a properly grounded power receptacle. Inspect the connecting
cables, test leads, and jumpers for possible wear, cracks, or breaks
before each use.

When installing equipment where access to the main power cord is
restricted, such as rack mounting, a separate main input power dis­connect device must be provided, in close proximity to the equip­ment and within easy reach of the operator.

For maximum safety, do not touch the product, test cables, or any
other instruments while power is applied to the circuit under test.
ALWAYS remove power from the entire test system and discharge
any capacitors before: connecting or disconnecting cables or jump­ers, installing or removing switching cards, or making internal
changes, such as installing or removing jumpers.

Do not touch any object that could provide a current path to the com­mon side of the circuit under test or power line (earth) ground. Always
make measurements with dry hands while standing on a dry, insulated
surface capable of withstanding the voltage being measured.

A good safety practice is to expect

no conductive part of the circuit may be

The instrument and accessories must be used in accordance with its
specifications and operating instructions or the safety of the equip­ment may be impaired.

Do not exceed the maximum signal levels of the instruments and ac­cessories, as defined in the specifications and operating informa­tion, and as shown on the instrument or test fixture panels, or
switching card.

When fuses are used in a product, replace with same type and rating
for continued protection against fire hazard

Chassis connections must only be used as shield connections for
measuring circuits, NOT as safety earth ground connections.

If you are using a test fixture, keep the lid closed while power is ap­plied to the device under test. Safe operation requires the use of a
lid interlock.

If a screw is present, connect it to safety earth ground using the
wire recommended in the user documentation.

!

The symbol on an instrument indicates that the user should re­fer to the operating instructions located in the manual.

The symbol on an instrument shows that it can source or mea­sure 1000 volts or more, including the combined effect of normal
and common mode voltages. Use standard safety precautions to
avoid personal contact with these voltages.

The

WARNING

result in personal injury or death. Always read the associated infor­mation very carefully before performing the indicated procedure.

The

CAUTION

damage the instrument. Such damage may invalidate the warranty.

Instrumentation and accessories shall not be connected to humans.

Before performing any maintenance, disconnect the line cord and
all test cables.

To maintain protection from electric shock and fire, replacement
components in mains circuits, including the power transformer, test
leads, and input jacks, must be purchased from Keithley Instru­ments. Standard fuses, with applicable national safety approvals,
may be used if the rating and type are the same. Other components
that are not safety related may be purchased from other suppliers as
long as they are equivalent to the original component. (Note that se­lected parts should be purchased only through Keithley Instruments
to maintain accuracy and functionality of the product.) If you are
unsure about the applicability of a replacement component, call a
Keithley Instruments office for information

To clean an instrument, use a damp cloth or mild, water based
cleaner. Clean the exterior of the instrument only. Do not apply
cleaner directly to the instrument or allow liquids to enter or spill
on the instrument. Products that consist of a circuit board with no
case or chassis (e.g., data acquisition board for installation into a
computer) should never require cleaning if handled according to in­structions. If the board becomes contaminated and operation is af­fected, the board should be returned to the factory for proper
cleaning/servicing.

heading in a manual explains dangers that might

heading in a manual explains hazards that could

2/01

DIGITAL I/O CAPABILITY: Forty independent inputs.

Forty independent outputs.

OUTPUT SPECIFICATIONS:

Configuration: 40 open collector drivers with factory installed

10kΩ pull up resistors. Pull-up resistors can be removed when
driving external pull-up devices. Each driver has an internal fly­back diode.

Pull up Voltage: 5.3V Internally supplied, external connection pro-

vided for user supplied voltage 25V max. Removal of internal
jumper allows user to use two different pull-up voltages.

Maximum Sink Current: Per Channel: 65mA.

Per Bank (8 bits): 500mA.
Per Card: 1A.

Current Limit: Positive Temperature Coefficient circuit protector

in series with each output. Output protection resistance <18Ω.

Collector-Emitter Saturation Voltage: <0.75V @ 1mA.

<1V @ 65mA.

Logic: Negative True.

INPUT SPECIFICATIONS:

Configuration: 40 inputs with internal 10kΩ pull-up resistors pro-

vided.

Characteristics:

Input logic low voltage: 0.8V max.
Input logic high voltage: 2V min.
Input logic low current: –600µA max. @ 0V
Input logic high current: 50µA max. @ 5V

Maximum Voltage Level: 42V pk.
Logic: Positive True.

7020/7020-D General Specifications

CONNECTOR:

7020: 96-pin male DIN connector.
7020-D: Cables with 50-pin male and female D-sub connectors.

ENVIRONMENT: Operating: 0° to 50°C, up to 35°C < 80% RH. Storage:

–25° to 65°C.

7020 and 7020-D Digital I/O Interface Cards

Specifications are subject to change without notice.

Output Channel

5.3V V

R

1

R

2

R1 = Pull-up Resistor = 10kΩ
R2 = Output Protection < 18Ω

Input Channel

R

R1 = Pull-up Resistor = 10kΩ
R2 = Input Protection = 100kΩ

5V

R

1

2

EXTERNAL

Output

GND

Input

GND

Table of Contents

1 Digital I/O Configuration

1.1 Introduction......................................................................................................................................................... 1-1

1.2 Digital outputs..................................................................................................................................................... 1-1

1.3 Controlling pull-up devices................................................................................................................................. 1-1

1.4 Controlling devices using pull-up resistors......................................................................................................... 1-1

1.5 Digital inputs....................................................................................................................................................... 1-1

2 Card Connections and Installation

2.1 Introduction ........................................................................................................................................................ 2-1

2.2 Internal connections ............................................................................................................................................ 2-1

2.3 Voltage source jumpers....................................................................................................................................... 2-1

2.4 Pull-up resistors................................................................................................................................................... 2-3

2.5 Card installation .................................................................................................................................................. 2-3

2.6 Card removal....................................................................................................................................................... 2-4

2.7 Input/output connections..................................................................................................................................... 2-4

2.8 Typical connection techniques............................................................................................................................ 2-6

2.9 Typical output connection schemes .................................................................................................................... 2-7

2.10 Typical input connection scheme........................................................................................................................ 2-9

2.11 Models 7020-D and 7020-DT ............................................................................................................................. 2-9

3 Operation

3.1 Introduction ........................................................................................................................................................ 3-1

3.2 Power limits ........................................................................................................................................................ 3-1

3.3 Channel status display......................................................................................................................................... 3-1

3.4 Channel assignments........................................................................................................................................... 3-2

3.5 Controlling output channels ................................................................................................................................ 3-3

3.6 Turning output channels On and Off .................................................................................................................. 3-3

3.7 Scanning output channels.................................................................................................................................... 3-4

3.8 Reading input channels ....................................................................................................................................... 3-4

3.9 IEEE-488 bus operation ...................................................................................................................................... 3-4

3.10 Turning output channels On and Off .................................................................................................................. 3-4

3.11 Scanning output channels.................................................................................................................................... 3-5

3.12 Reading input channels ....................................................................................................................................... 3-5

i

4 Service Information

4.1 Introduction ........................................................................................................................................................ 4-1

4.2 Handling and cleaning ........................................................................................................................................ 4-1

4.3 Channel functionality test ................................................................................................................................... 4-1

4.4 Static-sensitive devices....................................................................................................................................... 4-2

4.5 Principles of operation........................................................................................................................................ 4-2

4.6 Block diagram..................................................................................................................................................... 4-2

4.7 ID data circuits.................................................................................................................................................... 4-2

4.8 Output channel control ....................................................................................................................................... 4-3

4.9 Input channel control .......................................................................................................................................... 4-4

4.10 Power-on safeguard ............................................................................................................................................ 4-4

4.11 Troubleshooting.................................................................................................................................................. 4-4

4.12 Troubleshooting access....................................................................................................................................... 4-4

4.13 Troubleshooting procedure................................................................................................................................. 4-4

5 Replaceable Parts

5.1 Introduction......................................................................................................................................................... 5-1

5.2 Parts lists............................................................................................................................................................. 5-1

5.3 Ordering information .......................................................................................................................................... 5-1

5.4 Factory service.................................................................................................................................................... 5-1

5.5 Component layouts and schematic diagrams...................................................................................................... 5-1

ii

List of Illustrations

1 Digital I/O Configuration

Figure 1-1 Output configurations for pull-up devices ................................................................................................. 1-2

Figure 1-2 Output configuration using pull-up resistance ............................................................................................ 1-2

Figure 1-3 Input configuration...................................................................................................................................... 1-2

2 Card Connections and Installation

Figure 2-1 Voltage source jumpers for output channels............................................................................................... 2-2

Figure 2-2 Component locations — scanner board ...................................................................................................... 2-2

Figure 2-3 Voltage source jumper installation ............................................................................................................. 2-3

Figure 2-4 Model 7020 card installation in Model 7001 .............................................................................................. 2-4

Figure 2-5 96-pin DIN connector pinout ...................................................................................................................... 2-5

Figure 2-6 Typical round cable connection techniques ................................................................................................ 2-6

Figure 2-7 Model 7011-KIT-R (with/cable) assembly ................................................................................................. 2-7

Figure 2-8 Model 7011-MTR connector pinout ........................................................................................................... 2-7

Figure 2-9 Digital output, solenoid control .................................................................................................................. 2-8

Figure 2-10 Digital output, relay control........................................................................................................................ 2-8

Figure 2-11 Digital output, motor control ...................................................................................................................... 2-8

Figure 2-12 Digital output, logic device control............................................................................................................. 2-8

Figure 2-13 Digital input, monitoring micro-switches ................................................................................................... 2-9

Figure 2-14 Mating the PC-boards ................................................................................................................................. 2-9

Figure 2-15 Mating connector (solder-side view) ........................................................................................................ 2-10

3 Operation

Figure 3-1 Model 7001 channel status display ............................................................................................................. 3-2

Figure 3-2 Model 7002 channel status display (slot 1)................................................................................................. 3-2

Figure 3-3 Display organization for input and output channels ................................................................................... 3-2

Figure 3-4 Model 7020 programming channel assignments ........................................................................................ 3-3

4 Service Information

Figure 4-1 Testing an input or output channel.............................................................................................................. 4-2

Figure 4-2 Model 7020 block diagram ......................................................................................................................... 4-2

Figure 4-3 Start and stop sequences ............................................................................................................................. 4-3

Figure 4-4 Transmit and acknowledge sequence.......................................................................................................... 4-3

iii

iv

List of Tables

2 Card Connections and Installation

Table 2-1 Pull-up resistors identification .................................................................................................................... 2-3

Table 2-2 Output channel terminal identification ....................................................................................................... 2-5

Table 2-3 Input channel terminal identification .......................................................................................................... 2-5

Table 2-4 Miscellaneous terminal identification......................................................................................................... 2-6

Table 2-5 I/O connection accessories.......................................................................................................................... 2-6

Table 2-6 Terminal identification.............................................................................................................................. 2-10

4 Service Information

Table 4-1 Recommended troubleshooting equipment................................................................................................. 4-4

Table 4-2 Troubleshooting procedure ......................................................................................................................... 4-5

5 Replaceable Parts

Table 5-1 Model 7020 mass terminal board, parts list ................................................................................................ 5-2

Table 5-2 Model 7020 scanner board, parts list .......................................................................................................... 5-2

v

vi

1

Digital I/O Configuration

1.1 Introduction

This section covers the basic digital input and output config
urations for the Model 7020. Connection information for
these configurations is provided in Section 2 of this manual,
while operation (front panel and IEEE-488 bus) is explained
in Section 3.

1.2 Digital outputs

Output channels use negative true logic. That is, the output is
pulled low when the channel is turned on (closed).
Conversely, the output goes high when the channel is turned
off (open).

1.3 Controlling pull-up devices

Typically, the digital outputs are used to provide drive for
relatively high current devices such as solenoids, relays and
small motors. The configurations for these applications are
shown in Figure 1-1. Figure 1-1A uses the internal voltage
source (5.3V), while Figure 1-1B allows you to use an
external voltage source (V) for devices that require a higher
voltage (25V maximum). Internal jumpers are used to select
the voltage source. At the factory, the internal 5.3V source is
selected.

As shown in Figure 1-1, each output channel has a resettable
fuse (F) that is used to protect the output driver from exces­sive current. During normal operation, the resettable fuse is
in a low resistance state like a regular fuse. When output cur­rent reaches the trip level (around 180mA at 23°C, 130mA at
50°C), the fuse goes to a high resistance state that interrupts
the damaging high current. The fuse will automatically reset
to the low resistance state when the fault condition is re­moved.

Each output channel uses a fly-back diode for protection
when switching an inductive device, such as a solenoid coil.
This diode diverts the potentially damaging fly-back voltage
away from the driver.

1.4 Controlling devices using pull-up resistors

When interfacing outputs to high-impedance devices (i.e.
logic devices), pull-up resistors are used to achieve the ap­propriate logic level. Figure 1-2 shows the output configura
tion using the 10k Ω pull-up resistor (R

The configuration in Figure 1-2 uses the internal 5.3V source
as the high logic level. Notice that the 5.3V source is also
used to power the device. If you need a higher logic level,
you can place the jumper in the alternate position and apply
an external voltage (via V

EXT1

or V

EXT2

).

P

).

1.5 Digital inputs

Input channels use positive true logic. A channel is on
(closed) when the input is high (up to 42V peak). Conversely,
a channel is off (open) when the input is pulled low. As
shown in Figure 1-3, each channel uses a 10k Ω pull-up resis­tor (R

) that is connected to 5V. Thus, with nothing connect-

1

ed to the channel, the input is pulled high to 5V which turns
the channel on (closed).

The digital input is compatible with external TTL logic.
Each built-in pull-up resistor provides level shifting so that
devices such as micro-switches can be monitored. Each input
has a protection network that clamps the input at 5.7V. This
allows logic levels up to 42V peak to be monitored.

1-1

Digital I/O Configuration

7020

JUMPER

5.3V

F

DRIVER

A. Using Internal Voltage Source (5.3V)

7020

JUMPER

F

DRIVER

<18Ω

<18Ω

V

INT

OUTPUT

V

INT

OUTPUT

SOLENOID

OR RELAY

V

SOLENOID

OR RELAY

COIL

COIL

7020

Figure 1-3

Input configu ation

R

2

100kΩ

R

10kΩ

1

INPUT

GND

R1 = Pull-up resistor
R

= Input protection resistor

2

B. Using External Voltage Source (25V maximum)

Figure 1-1

Output configu ations for pull-up devices

7020

JUMPER

5.3V

DRIVER

Note: Pull-up resistor (R

Figure 1-2

Output configu ation using pull-up resistance

) installed

P

R

10kΩ

V

INT

P

OUTPUT

<18Ω

F

GND

A

OR

B

GATE

LOGIC

DEVICE

Y

1-2

2

Card Connections and Installation

2.1 Introduction

WARNING

The following connection and installa­tion procedures are to be performed by
qualified service personnel. Failure to
recognize and observe standard safety
precautions could result in personal in­jury or death.

NOTE

All input and output channels are electri­cally isolated from the backplane of the
mainframe.

2.2 Internal connections

NOTE

All internal connections are for the digital
outputs. No internal connections are re­quired for reading digital input channels.

2.3 V oltage source jumpers

Digital output high can be supplied by the internal 5.3V volt­age source, or by a user supplied voltage. At the factory, in­ternal jumpers are set to use the internal 5.3V source.

The 40 output channels are divided up into fi e banks (eight
output channels per bank) as shown in Figure 2-1. For each
bank, there is a plug-in jumper that allows you to select the
internal 5.3V source or an external source. In Figure 2-1,
Banks B, C and D use the 5.3V source, while Banks A and E
use an external source.

The I/O card can accommodate two different external volt­age sources (V
er W105 (see Figure 2-1). With W105 removed, the external
voltage source (V
isolated from the external voltage source (V
D and E.

The voltage source jumpers are located on the scanner board
as shown in Figure 2-2. Figure 2-3 shows how the plug-in
jumpers (W100 through W104) are installed.

EXT1

and V

) for Banks A, B and C is electrically

EXT1

) by removing (cutting) jump-

EXT2

EXT2

) for Banks

The Model 7020 is made up of two PC-boards that plug to­gether and are secured together by a 4-40 screw. To gain ac­cess to internal connections, remove the screw and carefully
separate the two boards. The board with the 96-pin DIN con­nector is called the mass terminal board, and the board with
the majority of components is called the scanner board.

2-1

F

F

Card Connections and Installation

5.3V
W104

1

BANK

A

8

igure 2-1

Voltage source jumpers for output channels

5.3V

V

EXT1

W103

BANK

B

V

EXT2

W105

5.3V
W102

9

BANK

C

16

5.3V
W101

17

BANK

D

24

5.3V
W100

25

32

BANK

E

33

40

R184 R183

W100 W101

igure 2-2

Component locations — scanner board

R182 R181

W102

W105

R180

W103 W104

2-2

F

Card Connections and Installation

JUMPER

5.3V V

A. 5.3V Source Selected

5.3V V

B. External Source Selected

EXT

JUMPER

EXT

igure 2-3

Voltage source jumper installation

2.4 Pull-up resistors

When interfacing outputs to high-impedance devices (i.e.
logic devices), pull-up resistors are used to achieve the ap­propriate logic level. These resistors are installed at the fac­tory. When interfacing digital output channels to pull-up
devices, such as solenoid coils and motors, the pull-up resis­tors for those channels have to be removed.

The 40 output channels are divided up into fi e banks (eight
output channels per bank). Each output bank has a 16-pin
DIP socket that is used for a thick film resistor network. Each
thick film resistor network has eight resistors to accommo­date the eight output channels. Thus, when you remove a re­sistor network, you remove the pull-up resistors for eight
output channels.

The resistor networks (R180 through R181) are located on
the scanner board (see Figure 2-2). To remove a resistor net­work, use a thin-bladed screwdriver and carefully pry the
chip out of the socket. Pull-up resistors should be replaced
with same value and wattage only.

2.5 Card installation

Perform the following steps to install the card assembly in
the Model 7001 or 7002 mainframe:

WARNING

T urn off power from all instrumentation
(including the Model 7001 or 7002
mainframe) and disconnect their line
cords. Make sure all power is removed
and any stored energy in external cir­cuitry is discharged.

1. Mate the mass terminal board to the scanner board if
they are separated. Install the supplied 4-40 screw at the
end of the card to secure the assembly. Make sure to
handle the cards by the edges and shields to prevent
contamination.

2. Facing the rear panel of the mainframe, select the slot
that you wish to install the card in.

3. Feed the I/O card assembly into the desired slot such
that the edges of the relay card ride in the rails.

4. With the ejector arms in the unlocked position, push the
card assembly all the way into the mainframe until the
arms engage into the ejector cups. Then push both arms
inward to lock the card into the mainframe. Figure 2-4
shows how the card installs in the Model 7001.

5. Install and tighten the safety ground screw shown in
Figure 2-4.

Table 2-1 indicates the resistor network for each bank of out­put channels.

T o avoid electric shock that could result

WARNING

in injury or death, make sure to properly

Table 2-1

Pull-up resistors identificatio

Output

Bank

A
B
C
D
E

channels

1 - 8
9 - 16
17 - 24
25 - 32
33 - 40

Resistor
network

R180
R181
R182
R183
R184

install and tighten the safety ground
screw shown in Figure 2-4.

2-3

F

Card Connections and Installation

Eje ct o r Arms (2)

2

1

Screw

Unlock card

2

Screw

igure 2-4

Model 7020 card installation in Model 7001

2.6 Card removal

To remove the card assembly, loosen the safety ground
screw, unlock it by pulling the latches outward, then pull the
card assembly out of the mainframe. Remember to handle
the card assembly by the edges and shields.

1

Lock ca rd

2.7 Input/output connections

Connections to external circuitry are made at the 96-pin male
DIN bulkhead connector. The pinout for this connector is
shown in Figure 2-5. This connector will mate to a 96-pin fe­male DIN connector.

Terminal identification for the DIN connector is provided by
Tables 2-2, 2-3 and 2-4. Table 2-2 provides terminal identifi
cation for digital output channels, Table 2-3 provides termi­nal identification for digital input channels and Table 2-4
provides identification for the rest of the I/O card terminals

2-4

F

1234567891011121314151617181920212223242526272829303132

igure 2-5

96-pin DIN connector pinout

Card Connections and Installation

View from
pin side of
connector

a
b
c

Table 2-2

Output channel terminal identificatio

Output
channel Bank

OUT1
OUT2
OUT3
OUT4
OUT5
OUT6
OUT7
OUT8
OUT9
OUT10
OUT11
OUT12
OUT13
OUT14
OUT15
OUT16
OUT17
OUT18
OUT19
OUT20

A
A
A
A
A
A
A
A
B
B
B
B
B
B
B
B
C
C
C
C

Connector
pin no.

2a
4a
6a
8a
10a
12a
14a
16a
18a
20a
22a
24a
26a
28a
30a
32a
2b
4b
6b
8b

Output
channel Bank

OUT21
OUT22
OUT23
OUT24
OUT25
OUT26
OUT27
OUT28
OUT29
OUT30
OUT31
OUT32
OUT33
OUT34
OUT35
OUT36
OUT37
OUT38
OUT39
OUT40

Table 2-3

Input channel terminal identificatio

Connector
pin no.

C
C
C
C
D
D
D
D
D
D
D
D
E
E
E
E
E
E
E
E

10b
12b
14b
16b
18b
20b
22b
24b
26b
28b
30b
32b
2c
4c
6c
8c
10c
12c
14c
16c

Input
channel Bank

IN1
IN2
IN3
IN4
IN5
IN6
IN7
IN8
IN9
IN10
IN11
IN12
IN13
IN14
IN15
IN16
IN17
IN18
IN19
IN20

A
A
A
A
A
A
A
A
B
B
B
B
B
B
B
B
C
C
C
C

Connector
pin no.

1a
3a
5a
7a
9a
11a
13a
15a
17a
19a
21a
23a
25a
27a
29a
31a
1b
3b
5b
7b

Input
channel Bank

IN21
IN22
IN23
IN24
IN25
IN26
IN27
IN28
IN29
IN30
IN31
IN32
IN33
IN34
IN35
IN36
IN37
IN38
IN39
IN40

C
C
C
C
D
D
D
D
D
D
D
D
E
E
E
E
E
E
E
E

Connector
pin no.

9b
11b
13b
15b
17b
19b
21b
23b
25b
27b
29b
31b
1c
3c
5c
7c
9c
11c
13c
15c

2-5

Card Connections and Installation

F

Table 2-4

Miscellaneous terminal identificatio

Terminal Connector pin no.

GND

5.3V

5.3V
GND
VEXT1
VEXT1
GND
GND
VEXT2
VEXT2
NC
NC
NC
NC
NC
NC

17c
18c
19c
20c
21c
22c
23c
24c
25c
26c
27c
28c
29c
30c
31c
32c

2.8 T ypical connection techniques

WARNING

Before beginning any wiring proce­dures, make sure all power is off and
any stored energy in external circuitry is
discharged.

NOTE

External circuitry should be connected
(plugged in) only with the mainframe
power off. Power should only be turned on
after the Model 7020 is installed in the
mainframe.

Round cable assemblies —

Figure 2-6 shows a typical
round cable connection technique using accessories avail­able from Keithley.

Multi-Pin

Connector

Card

Wire directly to
instrumentation

and DUT

Keithley has two connector accessories available to
accommodate connections from the DIN connector of the
card to external circuitry. These accessories are summarized
in Table 2-5.

Table 2-5

I/O connection accessories

Model Description

7011-KIT-R

96-pin female DIN connector and housing
for round cable.

7011-MTR

96-pin male DIN bulkhead connector.

CAUTION

Do not use the Model 7011-MTC-2 cable
with the Model 7020. Damage to the
card could result.

All input and/or output circuitry that you wish to connect to
the card must be terminated with a single 96-pin female DIN
connector. The following connection techniques provide
some guidelines and suggestions for wiring your circuitry.

7011-KIT-R

Connector Kit

Notes: Figure 2-7 provides an exploded view showing

how the connector (with cable) is assembled.

Cable Hitachi p/n N2807-P/D-50TAB is a
50-conductor round cable. Two of these cables
can be used to supply 100 conductors.

Cable

igure 2-6

Typical round cable connection techniques

Connections are accomplished using a custom-built cable as­sembly that consists of a Model 7011-KIT-R connector and
a suitable round cable. Hitachi cable part number N2807-P/
D-50TAB is a 50-conductor cable. Two of these cables can
be used to supply 100 conductors. The connector has solder
cups to accommodate the individual wires of the unterminat­ed cable. Figure 2-7 provides an exploded view of the con­nector assembly and shows how the cable is connected. The
connector end of the resultant cable assembly mates directly
to the connector on the digital I/O card. The unterminated
end of the cable assembly can be wired directly to external
circuitry.

Also included in Table 2-5 is a male DIN bulkhead connector
(Model 7011-MTR). This connector has solder cups to allow
direct connection to external circuitry. The bulkhead
connector can then be connected to the digital I/O card via a
custom-built cable assembly using two Model 7011-KIT-R
connectors. Figure 2-8 provides the pinout for the bulkhead
connector.

2-6

F

F

Card Connections and Installation

igure 2-7

Model 7011-KIT-R (with/cable) assembly

View from

solder cup side

of connector

a
b
c

3231302928272625242322212019181716151413121110987654321

Note: See Tables 2-2, 2-3 and 2-4 for terminal identification.

igure 2-8

Model 7011-MTR connector pinout

2.9 T ypical output connection schemes

The following examples show output connections from the
I/O card to external circuitry, and summarized the required
internal connections on the card. For details on the internal
connections, see “Internal Connections” at the beginning of
this section.

Solenoid control —

nection scheme to control solenoids. This example assumes
that an external 24V source is being used. The pull-up resis­tors for output channels 1, 2 and 3 (R180) are removed for
this application.

Figure 2-9 shows a digital output con-

A solenoid is energized when the corresponding output
channel is turned on (closed).

Relay control —

Figure 2-10 shows a digital output connec­tion scheme to control relays. This example assumes that the
internal 5.3V voltage source is being used, and the pull-up
resistors for output channels 9, 10, and 11 (R181) are re­moved for this application.

A relay coil is energized when the corresponding output
channel is turned on (closed).

2-7

Card Connections and Installation

F

F

F

F

7020

V

EXT1

OUT 1
OUT 2
OUT 3

GND

INTERNAL CONNECTIONS:

EXTERNAL VOL TAGE SOURCE (V
PULL-UP RESISTORS (R180) REMOVED.

igure 2-9

Digital output, solenoid control

7020

5.3V

OUT 9
OUT 10

SOLENOIDS

) SELECTED.

EXT1

RELAY COILS

7020

V

+

24V

–

INTERNAL CONNECTIONS:

EXTERNAL VOL TAGE SOURCE (V
PULL-UP RESISTORS (R182) REMOVED.

EXT2

OUT 17
OUT 18

GND

MOTORS

M M

) SELECTED.

EXT2

+

12V

–

igure 2-11

Digital output, motor control

Logic device control —

Figure 2-12 shows a digital output
connection scheme to control a logic device. This example
assumes that the internal 5.3V voltage source is being used,
and the pull-up resistors for channels 25, 26 and 27 (R183)
are installed.

OUT 11

INTERNAL CONNECTIONS:

INTERNAL VOLTAGE SOURCE (5.3V) SELECTED.
PULL-UP RESISTORS (R181) REMOVED.

igure 2-10

Digital output, relay control

Motor control —

Figure 2-11 shows a digital output connec­tion scheme to control small 12V dc motors. An external 12V
voltage source is used to provide the necessary voltage level.

7020

OUT 25
OUT 26
OUT 27

5.3V
GND

INTERNAL CONNECTIONS:

INTERNAL VOLTAGE SOURCE (5.3V) SELECTED.
PULL-UP RESISTORS (R183) INSTALLED.

A
B
C

G2A

LOGIC DEVICE

74LS138

DMUX

V

CC

GND

Y0
Y1
Y2
Y3
Y4
Y5
Y6
Y7

This example assumes that the pull-up resistors for channels
17 and 18 (R182) are removed.

igure 2-12

Digital output, logic device control

A motor is turned on when the corresponding output channel
is turned on (closed).

2-8

F

4-40 x ¼” PPHSEM

(5 IN-LBS)

7020-010,

SCANNER BOARD

7020-019,

MASS TERM BOARD

WARNING

Figure 2-14

Mating the PC-boards

Card Connections and Installation

The logic device is a demultiplexer (DMUX). The binary
pattern (value) seen at the input of the DMUX (lines A, B and
C) determines which DMUX output line (Y0 through Y7) is
selected (pulled low). For example, with channels 25, 26 and
27 off (open), lines A, B and C are high. The binary 7 at the
DMUX input (A = 1, B = 1 and C = 1) selects (pulls low) out­put Y7. If channel 26 is turned on (closed), line B goes low.
The binary 5 seen at the DMUX input (1, 0, 1) selects (pulls
low) Y5.

NOTE

With jumper W105 removed, all of the
above output connection schemes could be
used at the same time (assuming that cur­rent sink limits are not exceeded). Remov­ing jumper W105 allows you to use two
different external voltage sources (V
and V

EXT2

).

EXT1

2.10 T ypical input connection scheme

Figure 2-13 shows a digital input connection scheme to mon­itor the state of micro-switches. With a switch open, the cor­responding input channel is pulled high by the internal pull­up resistor. As a result, the input channel is on (closed).

2.11 Models 7020-D and 7020-DT

The Models 7020-D and 7020-DT are alternate configura
tions of the Model 7020 Digital I/O Interface Card. The
Model 7020 consists of a scanner card and a connector card
in a sandwich. The configurations are as foll ws:

• Model 7020 — Scanner card and mass-terminated card
with 96-pin male DIN connector.

• Model 7020-D — Scanner card and mass-terminated
card/cable with 50-pin male and female D-Sub
connectors.

• Model 7020-DT — Spare mass-terminated card/cable
with 50-pin male and female D-Sub connectors.

This section describes additional information for the Models
7020-D and 7020-DT

Internal connections

The two PC-boards that plug together are secured by a 4-40
screw (see Figure 2-14).

When a switch is closed, the corresponding input channel is
pulled low to ground. As a result, the input channel is off
(open).

igure 2-13

Digital input, monitoring micro-switches

7020

MICRO-

SWITCHES

IN 1

IN 2
IN 3

GND

2-9

Card Connections and Installation

F

Input/output connections

WARNING

Connection and installation procedures
are to be performed by qualified service
personnel. Failure to recognize and ob­serve standard safety precautions could
result in personal injury or death.

Table 2-6

Terminal identificatio

Signal Pin Signal Pin Signal Pin Signal Pin

IN14
IN13
IN12
IN11
IN10

IN9
IN8
IN7
IN6
IN5
IN4
IN3
IN2

IN1
N/C
N/C
N/C

DIG GND

N/C

IN15
IN16
IN17
IN18
IN19
IN20

Connections to external circuitry are made at the 50-pin
D-Sub connectors. Connector pinouts are shown in Table
2-6. Figure 2-15 shows the solder-side view of a mating
connector.

17

33

50

igure 2-15

Mating connector (solder-side view)

Male D-Sub (Digital In) Female D-Sub (Digital Out)

1
2
3
4
5
6
7
8

9
10
11
12
13
14
15
16
17
33
32
31
30
29
28
27
26

IN21
IN22
IN23
IN24
IN25
IN26
IN27
IN40
IN39
IN38
IN37
IN36
IN35
IN34
IN33
IN32
IN31
IN30
IN29
IN28

DIG GND

N/C
N/C
N/C
N/C

25
24
23
22
21
20
19
18
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50

VEXT1
VEXT1
OUT14
OUT13
OUT12
OUT11
OUT10

OUT9
OUT8
OUT7
OUT6
OUT5
OUT4
OUT3
OUT2

OUT1
OUT15
OUT16
OUT17
OUT18
OUT19
OUT20
OUT21
OUT22
OUT23

1
2
3
4
5
6
7
8

9
10
11
12
13
14
15
16
17
33
32
31
30
29
28
27
26

OUT24
OUT25
OUT26
OUT27

+5.3V

DIG GND

VEXT2

+5.3V

VEXT2

DIG GND

OUT40
OUT39
OUT38
OUT37
OUT36
OUT35
OUT34
OUT33
OUT32
OUT31
OUT30
OUT29
OUT28

N/C
N/C

1

18

34

25
24
23
22
21
20
19
18
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50

2-10

3

Operation

3.1 Introduction

The information in this section is organized as follows:

• Power limits — Covers the maximum power limits of
the Model 7020 Digital I/O Interface Card.

• Channel status display — Summarizes how the main­frame display is used to provide status of input and out­put channels.

• Channel assignments — Reviews how I/O card chan­nels and mainframe slots are designated for channel and
scan lists.

• Controlling output channels — Explains how to open/
close and scan output channels from the front panel.

• Reading input channels — Explains how to read input
channels from the front panel.

• IEEE-488 bus operation — Summarizes the commands
used to control output channels and read input channels
from over the IEEE-488 bus.

The following information pertains to the Model 7020 Digi­tal I/O Interface card. It assumes that you are familiar with
the operation of the Model 7001/7002 mainframe.

If you are not familiar with the operation of the mainframe,
refer to the Model 7001 or 7002 Instruction Manual after
reading the following information.

Output channels:

Maximum User Supplied Pull-Up Voltage: 25V.

Maximum Sink Current:

Per channel: 65mA

Per bank: 500mA (see note).

Per card: 1A.

NOTE

A bank refers to the internal IC that is used
to drive eight output channels. The card
uses fi e driver ICs (banks) to accommo­date the 40 output channels. The channels
are grouped as follows for each bank:

Bank 1 = Channels 1 through 8

Bank 2 = Channels 9 through 16

Bank 3 = Channels 17 through 24

Bank 4 = Channels 25 through 32

Bank 5 = Channels 33 through 40

As specified, the maximum output current for each 8-bit
bank (i.e. channels 1 through 8) is 500mA.

Input channels:

Maximum Voltage Level: 42V peak.

3.2 Power limits

To ensure proper operation and prevent damage to the card,
never exceed the following power limits.

3.3 Channel status display

The Model 7001 has a channel status display (Figure 3-1)
that provides the real-time state of each input or output chan­nel. The left portion of the display is for slot 1 (Card 1), and

3-1

Operation

F

M

F

M

F

D

1234567891012345678910

igure 3-1

odel 7001 channel status display

7001 DISPLAY

CARD 1 CARD 2

= OPEN CHANNEL

= CLOSED CHANNEL

the right portion is for slot 2 (Card 2). For the Model 7002,
channel status LED grids are used for the 10 slots. The LED
grid for slot 1 is shown in Figure 3-2.

Input/output channel organization of the channel status
display for each slot is shown in Figure 3-3. The card
contains 40 independent input channels and 40 independent
output channels. All input and output channels are isolated
from the backplane of the mainframe. With the mainframe in
the normal display state, the status (on or off) of the output
channels is displayed. When the mainframe is in the read
input channels mode, the status (on or off) of the input
channels is displayed.

Output channels use negative true logic. That is, the output is
pulled low when the channel is turned on (closed).
Conversely, the output goes high when the channel is turned
off (open).

Input channels use positive true logic. A channel is on
(closed) when the input is high. Keep in mind that an open
input is pulled high by the internal pull-up resistor. Con­versely, a channel is off (open) when the input is pulled low
to ground.

7002 LED DISPLAY

SLOT 1

ROW

1234 6785910

1

2

3

4

COLUMN

1 2 3 4 5 6 7 8 9 10

11 12 13 14 15 16 17 18 19 20

21 22 23 24 25 26 27 28 29 30

31 32 33 34 35 36 37 38 39 40

igure 3-3

isplay organization for input and output channels

3.4 Channel assignments

Each input and output channel has a CHANNEL assignment,
which includes the slot number that the card is installed in.
Figure 3-4 shows the CHANNEL assignments for slots 1 and

2. Each CHANNEL assignment is made up of the slot desig­nator (1 or 2) and the channel (1 to 40). For the Model 7002,
the slot designator can be from 1 to 10 since there are 10
slots.

To be consistent with Model 7001/7002 operation, the slot
designator and channel are separated by an exclamation
point (!). Some examples of CHANNEL assignments are as
follows:

CHANNEL 1!1 = Slot 1, Channel 1

CHANNEL 2!40 = Slot 2, Channel 40

CHANNEL 6!23 = Slot 6, Channel 23

CHANNEL 10!36 = Slot 10, Channel 36

= OPEN CHANNEL

= CLOSED CHANNEL

igure 3-2

odel 7002 channel status display (slot 1)

3-2

A. SLOT 1

F

M

(CARD 1)

B. SLOT 2

(CARD 2)

Operation

12345678910

1!1 1!2 1!3 1!4 1!5 1!6 1!7 1!8 1!9 1!10

1!11 1!12 1!13 1!14 1!15 1!16 21!17 1!18 1!19 1!20

1!21 1!22 1!23 1!24 1!25 1!26 1!27 1!28 1!29 1!30

1!31 1!32 1!33 1!34 1!35 1!36 1!37 1!38 1!39 1!40

12345678910

2!1 2!2 2!3 2!4 2!5 2!6 2!7 2!8 2!9 2!10

2!11 2!12 2!13 2!14 2!15 2!16 2!17 2!18 2!19 2!20

2!21 2!22 2!23 2!24 2!25 2!26 2!27 2!28 2!29 2!30

2!31 2!32 2!33 2!34 2!35 2!36 2!37 2!38 2!39 2!40

EXAMPLES: 1!18 = SLOT 1, CHANNEL 18

2!36 = SLOT 2, CHANNEL 36

igure 3-4

odel 7020 programming channel assignments

3.5 Controlling output channels

Output channels are displayed and controlled from the nor­mal display state of the Model 7001 or 7002. If currently in
a menu structure, use the EXIT key to return to the normal
display state.

3.6 Turning output channels On and Off

An output channel is turned on by simply keying in the
CHANNEL assignment and pressing CLOSE. When a chan­nel is on (closed), ~0V is seen at the output (negative true
logic). For example, to turn on output channel 36 of an I/O
card installed in slot 2, key in the following channel list and
press CLOSE:

SELECT CHANNELS 2!36

The above channel can be turned off by pressing OPEN or
OPEN ALL. The OPEN key turns off only the channels
specified in the channel list, and OPEN ALL turns off all
channels.

The following display is an example of a channel list that
consists of several channels:

SELECT CHANNELS 2!1, 2!3, 2!22-2!25

Notice that channel entries are separated by commas (,). A
comma is inserted by pressing ENTER or the right cursor
key. The channel range is specified by using the hyphen (-)
key to separate the range limits. Pressing CLOSE will turn
on all the channels specified in the channel list. Pressing
OPEN (or OPEN ALL) will turn off the channels.

Channel patterns can also be used in a channel list. This
allows you control specific bit patterns for logic circuits.
Example:

SELECT CHANNELS 2!1, M1

Pressing CLOSE will turn on channel 2!1 and the channels
that make up channel pattern M1. Refer to the instruction
manual for the mainframe for information on defining chan­nel patterns.

Note that for the Model 7002 mainframe, you can use the
light pen to turn output channels on and off.

3-3

Operation

3.7 Scanning output channels

Output channels are scanned by creating a scan list and con­figuring the Model 7001/7002 to perform a scan. The scan
list is created in the same manner as a channel list (see Turn­ing Output Channels On and Off). However, the scan list is
specified from the “SCAN CHANNELS” display mode. The
SCAN LIST key toggles between the channel list and the
scan list. The following shows an example of a scan list:

SCAN CHANNELS 2!1, 2!3, 2!21-2!25

When a scan is performed, the channels specified in the scan
list will be scanned in the order that they are presented in the
scan list.

Channel patterns can also be used in a scan list. This allows
you control specific bit patterns for logic circuits. Example:

SCAN CHANNELS M1, M2, M3, M4

When M1 is scanned, the channels that make up channel pat­tern M1 will turn on. When M2 is scanned, the M1 channels
will turn off and the channels that make up M2 will turn on.
M3 and M4 are scanned in a similar manner. Refer to the in­struction manual for the mainframe for information on defin
ing channel patterns.

Perform the following steps to configure the mainframe to
display the digital input channels:

1. Press the CARD CONFIGURATION key to display the
CARD CONFIG MENU.

2. Use the and keys to place the cursor on READ-I/
O-CARD and press ENTER.

Model 7001 Mainframe — The real-time state (on or
off) of each input channel is provided on the display.
Only I/O card channels are displayed.

Model 7002 Mainframe — The real-time state (on or
off) of each channel is provided by the appropriate LED
display grid. Use the TYPE option of the CARD CON­FIG MENU if you don't know which slot the I/O card is
installed in.

3. Use the EXIT key to exit from the “read input channels”
display mode.

NOTE

With input channels displayed, you can
turn off (open) all output channels by
pressing OPEN ALL.

A manual scan can be performed by using the RESET de­fault conditions of the Model 7001/7002. RESET is selected
from the SAVESETUP menu of the main MENU. When RE­SET is performed, the mainframe is configured for an infinit
number of manual scans. The first press of STEP takes the
mainframe out of the idle state. The next press of STEP will
close the first channel specified in the scan list. Each subse­quent press of STEP will select the next channel in the scan
list.

3.8 Reading input channels

Input channels are read from the READ-I/O-CARD option
of the CARD CONFIG MENU of the mainframe. This menu
is accessed by pressing the CARD key. In this “read input
channels” display mode, the mainframe displays the real­time state of each input channel.

Input channels use positive true logic. A channel is on
(closed) when the input is high. Keep in mind that an open
input is pulled high by the internal pull-up resistor. Con­versely, a channel is off (open) when the input is pulled low
to ground.

3.9 IEEE-488 bus operation

Bus operation is demonstrated using Microsoft QuickBASIC

4.5, the Keithley KPC-488.2 (or Capital Equipment Corpo­ration) IEEE interface and the HP-style Universal Language
Driver (CECHP). Refer to “QuickBASIC 4.5 Programming”
in the mainframe manual for details on installing the Univer­sal Language Driver, opening driver files and setting the in­put terminal. Program statements assume that the primary
address of the mainframe is 07.

3.10 Turning output channels On and Off

The following SCPI commands are used to turn output chan­nels on and off:

:CLOSe <list> Turn on specified channel
:OPEN <list>|ALL Turn off specified (or all) channels.

The following program statement turns on channels 1!1, 1!4
through 1!6, and the channels that make up channel pattern
M1.

PRINT #1, "output 07; clos (@ 1!1, 1!4:1!6, M1)"

3-4

Notice that the colon (:) is used to separate the range limits.

Operation

Either of the following statements turns off channels 1!1, 1!4
through 1!6, and the channels of M1:

PRINT #1, "output 07; open (@ 1!1, 1!4:1!6, M1)"
PRINT #1, "output 07; open all"

3.11 Scanning output channels

There are many commands associated with scanning. How­ever, it is possible to configure a scan using as little as four
commands. These commands are listed as follows:

*RST
:TRIGger:COUNt:AUTo ON
:ROUTe:SCAN <list>
:INIT

The first command resets the mainframe to a default scan
configuration. The second command automatically sets the
channel count to the number of channels in the Scan List, the
third command defines the Scan List and the fourth com­mand takes the Model 7001/7002 out of the idle state.

The following program fragment will perform a single scan
of output channels 1 through 4 of slot 1, and the channels that
make up channel pattern M1:

PRINT #1, "output 07; *rst"
PRINT #1, "output 07; trig:coun:auto on"
PRINT #1, "output 07; scan (@ 1!1:1!4, M1)"
PRINT #1, "output 07; init"

PRINT #1, "output 07; trig:del 0.5"

PRINT #1, "output 07; scan (@ 1!1:1!4, M1)"
PRINT #1, "output 07; init"

The first statement opens all channels, and the fourth state­ment sets a 1/2 second delay after each channel closes.

3.12 Reading input channels

The following SCPI commands are used to read the status of
input channels:

:SENSe2:DATA? <list> Read input channels; Slot 1
:SENSe3:DATA? <list> Read input channels; Slot 2
:SENSe4:DATA? <list> Read input channels; Slot 3
:SENSe5:DATA? <list> Read input channels; Slot 4
:SENSe6:DATA? <list> Read input channels; Slot 5
:SENSe7:DATA? <list> Read input channels; Slot 6
:SENSe8:DATA? <list> Read input channels; Slot 7
:SENSe9:DATA? <list> Read input channels; Slot 8
:SENSe10:DATA? <list> Read input channels; Slot 9
:SENSe11:DATA? <list> Read input channels; Slot 10

The conventional form for the <list> parameter includes the
slot and input channel number. However, for these com­mands you do not need to include the slot number. For exam­ple, you can send either of the following two commands to
read input channel 23 in slot 6:

:SENSe7:DATA? (@6!23) or :SENSe7:DATA? (@23)

The first statement selects the *RST default configurationfor
the scan. The second statement sets channel count to the
scan-list-length (5). The third statement defines the scan list,
and the last statement takes the mainframe out of the idle
state. The scan is configured to start as soon as the :INIT
command is executed.

When the above program fragment is run, the scan will be
completed in approximately 30 milliseconds (3msec delay
for channel closures and 3msec delay for each open), which
is too fast to view from the front panel. An additional relay
delay can be added to the program to slow down the scan for
viewing. The program is modified by adding a statement to
slow down the scan. Also, a statement is added to the begin­ning of the program to ensure that all channels are open be­fore the scan is started. The two additional statements are
indicated in bold typeface.

PRINT #1, "output 07; open all"

PRINT #1, "output 07; *rst"
PRINT #1, "output 07; trig:coun:auto on"

After the mainframe is addressed to talk, the response mes­sage will indicate the state of each listed input channel. A re­turned “0” indicates that the channel is off (open), and a
returned “1” indicates that the channel is on (closed).

The following program fragment reads channel 3 of a digital
I/O card installed in slot 1:

PRINT #1, "output 07; sens2:data? (@3)"
PRINT #1, "enter 07"
LINE INPUT #2, A$
PRINT A$

The first statement reads input channel 3 (slot 1). The second
statement addresses the mainframe to talk (sends response
message to computer). The third statement reads the re­sponse message and the last statement displays the message
(0 or 1) on the computer CRT.

The above program fragment is modified to read all 40 input
channels in slot 1 as follows. The modified statement is
shown in bold typeface.

3-5

Operation

PRINT #1, "output 07; sens2:data? (@1:40)"

PRINT #1, "enter 07"
LINE INPUT #2, A$
PRINT A$

The response message will include a “0” (off) or “1” (on) for

each of the 40 input channels (i.e. “0, 0, 0, 1, 0..... 0, 1”).

3-6

4

Service Information

WARNING

The information in this section is in­tended only for qualified service person­nel. Some of the procedures may expose
you to hazardous voltages that could re­sult in personal injury or death. Do not
attempt to perform these procedures
unless you are qualified to do so.

4.1 Introduction

This section contains information necessary to service the
Model 7020 card and is arranged as follows:

• Handling and cleaning: Discusses handling precautions
and methods to clean the card should it become
contaminated.

• Functionality test: Provides a test procedure to
determine if an input or output channel is functioning
properly.

• Special handling of static-sensitive Devices: Reviews
precautions necessary when handling static-sensitive
devices.

• Principles of operation: Briefly discusses circuit
operation.

• Troubleshooting: Presents some troubleshooting tips
for the Model 7020.

4.2 Handling and cleaning

Care should be taken when handling or servicing the card to
prevent possible contamination. The following precautions
should be taken when servicing the card.

Handle the card only by the edges and shields. Do not touch
any board surfaces or components not associated with the re­pair. Do not touch areas adjacent to electrical contacts.

Should it become necessary to use solder on the circuit
board, use an OA-based (organic activated) flux. Remove the
flux from the work areas when the repair has been complet­ed. Use pure water along with clean cotton swabs or a clean
soft brush to remove the flux.Take care not to spread the flu
to other areas of the circuit board. Once the flux has been re­moved, swab only the repaired area with methanol, then
blow dry the board with dry nitrogen gas.

4.3 Channel functionality test

An input or output channel can be tested without the use of
test equipment.

1. As shown in Figure 4-1, connect the suspect input or
output channel to an output or input channel that is
known to be functioning properly. Note that for the out­put channel, the pull-up resistor must be installed, and
the internal 5.3V supply must be used.

2. From the front panel of the mainframe, turn on (close)
the output channel. Verify that the display indicates that
the output channel is on (closed). Keep in mind that the
output is low when the channel is turned on.

4-1

Service Information

F

F

M

OUTPUT CHANNEL

OUT

GND

INTERNAL CONNECTIONS:

INTERNAL VOLTAGE SOURCE (5.3V) SELECTED.
PULL-UP RESISTOR INSTALLED.

INPUT CHANNEL

IN

GND

igure 4-1

Testing an input or output channel

3. Place the mainframe in the “read input channels” dis­play mode by selecting the READ-I/O-CARD option of
the CARD COFIGURATION MENU. Verify on the dis­play that the input channel is off (open).

4. On the mainframe, press OPEN ALL to turn off (open)
the output channel and verify on the display that the in­put channel turns on (closes).

5. On the mainframe, use the EXIT key to return the instru­ment to the normal display mode and verify on the dis­play that the output channel is off (open).

5. Use only anti-static type de-soldering tools and
grounded-tip soldering irons.

4.5 Principles of operation

The following paragraphs discuss the basic operating princi­ples for the Model 7020, and can be used as an aid in trou­bleshooting the card. The schematic drawing of the Scanner
card is shown on drawing number 7020-106, located at the
end of this Section 5.

4.6 Block diagram

Figure 4-2 shows a simplified block diagram of the
Model 7020. Key elements include the output channel driv­ers and the input channel registers, as well as the ROM,
which contains card ID and configuration information. These
various elements are discussed in the following paragraphs.

FROM

MAINFRAME

OUT DATA

OUT CLOCK

STROBE

ENABLE

OUTPUT

CHANNEL

DRIVERS

U109 –

U113

OUT 1

OUT 2

OUT 40

4.4 Static-sensitive devices

CMOS and other high-impedance devices are subject to pos­sible static discharge damage because of the high-impedance
levels involved. When handling such devices, use the precau­tions listed below.

In order to prevent damage, assume that all parts are static­sensitive.

1. Such devices should be transported and handled only in
containers specially designed to prevent or dissipate
static build-up. Typically, these devices will be received
in anti-static containers made of plastic or foam. Keep
these parts in their original containers until ready for in­stallation or use.

2. Remove the devices from their protective containers
only at a properly-grounded workstation. Also, ground
yourself with an appropriate wrist strap while working
with these devices.

3. Handle the devices only by the body; do not touch the
pins or terminals.

4. Any printed circuit board into which the device is to be
inserted must first be grounded to the bench or table

TO

MAINFRAME

FROM

MAINFRAME

TO/FROM

MAINFRAME

IN DATA

IN CLOCK

STROBE

ENABLE

ID CLK

ID DATA

INPUT
CHANNEL
REGISTERS

U100 –

U104

ROM

U107

IN 1

IN 2

IN 40

igure 4-2

odel 7020 block diagram

4.7 ID data circuits

Upon power-up, card identification information from each
card is read by the mainframe. This ID data includes such in­formation as card ID, settling time, and channel configura
tion information. ID data is contained within an on-card
EEPROM (U107). In order to read this information, the se­quence described below is performed on power-up.

4-2

Service Information

F

F

1. The ID DATA line (pin 5 of U107) is set from high to
low while the ID CLK line (pin 6 of U107) is held high.
This action initiates a start command to the ROM to
transmit data serially to the mainframe (Figure 4-3).

2. The mainframe sends the ROM address location to be
read over the ID DATA line. The ROM then transmits an
acknowledge signal back to the mainframe, and it then
transmits data at that location back to the mainframe
(Figure 4-4).

3. The mainframe then transmits an acknowledge signal,
indicating that it requires more data. The ROM will then
sequentially transmit data after each acknowledge sig­nal it receives.

4. Once all data is received, the mainframe sends a stop
command, which is a low-to-high transition of the ID
DATA line with the ID CLK line held high (see
Figure 4-3).

ID CLK

ID DATA

4.8 Output channel control

Digital output channels are controlled by serial data
transmitted from the mainframe to the I/O card via the
OUTDATA line. A total of fi e bytes (40-bits) are shifted in
a serial fashion into latches located in the output channel
driver ICs. The serial data is clocked in by the OUTCLK line.
As data overfl ws one register, it is fed out the Q’S line of the
register down the chain.

Once all fi e bytes have shifted into the card, the STROBE
line is set high to latch the output channel information into
the Q outputs of the output channel drivers. Note that a chan­nel driver output goes low when it is turned on (closed).

START BIT STOP BIT

igure 4-3

Start and stop sequences

ID CLK

ID DATA

(DATA OUTPUT

FROM

MAINFRAME

OR ROM)

ID DATA

(DATA OUTPUT

FROM

MAINFRAME

OR ROM)

START ACKNOWLEDGE

igure 4-4

Transmit and acknowledge sequence

1 89

4-3

Service Information

4.9 Input channel control

The mainframe reads digital input channels of the I/O card
from a serial, fi e-byte (40-bits) data stream (via INDATA
line).

Digital inputs are applied in a parallel fashion to the fi e in­put channel registers (8 channels per register). When the dig­ital inputs are read, the STROBE line goes high to latch the
input channel information. The INCLOCK line then clocks
out the information as a serial, fi e-byte (40-bits) data stream
(via INDATA line) to the mainframe. As data empties from
the lead register (U100), it is replaced by data via the Q7 line
of the registers down the chain.

Note that a channel is on (closed) when the input is high.

4.10 Power-on safeguard

NOTE

The power-on safeguard circuit discussed
below is actually located on the digital
board in the mainframe.

A power-on safeguard circuit, made up of a D-type flip-fl
and associated components ensures that output channels do
not randomly turn on (close) when power is cycled. This cir­cuit disables all output channels during power-up and power­down periods.

The PRESET line on the D-type flip-flo is controlled by the
68302 microprocessor, while the CLK line of the D-type
flip-flo is controlled by a VIA port line on the 68302 proces­sor. The Q output of the flip-flo drives each I/O card output
channel driver IC enable pin (U109-U113, pin 8).

When the 68302 microprocessor is in the reset mode, the
flip-flo PRESET line is held low, and Q out immediately
goes high, disabling all output channels (output channel IC
enable pins are high). After the reset condition elapses
(~200msec), PRESET goes high while Q out stays high.
When the first valid STROBE pulse occurs, a low logic level
is clocked into the D-type flip-flop setting Q out low and en­abling all output channel drivers simultaneously. Note that Q
out stays low, (enabling output channel drivers) until the
68302 processor goes into a reset condition.

4.11 Troubleshooting

Troubleshooting equipment

Table 4-1 summarizes recommended equipment for trouble­shooting the Model 7020.

Table 4-1

Recommended troubleshooting equipment

Manufacturer

Description

Multimeter
Oscilloscope

and model Application

Keithley 2000
TEK 2243

Measure DC voltages
View logic waveforms

4.12 Troubleshooting access

In order to gain access to the scanner board top surface to
measure voltages under actual operating conditions, perform
the following steps:

1. Disconnect the mass terminal card from the scanner
board card.

2. Remove the mainframe cover.

3. Install the scanner board card in slot 1.

4. Turn on mainframe power to measure voltages (see fol­lowing paragraph).

4.13 Troubleshooting procedure

Table 4-2 summarizes I/O card troubleshooting.

WARNING

Lethal voltages are present within main­frame. Some of the procedures may ex­pose you to hazardous voltages. Observe
standard safety precautions for dealing
with live circuits. Failure to do so could
result in personal injury or death.

CAUTION

To avoid contamination, always handle
the card only by the handle and side
edges. Do not touch edge connectors,
board surfaces, or components on the
card. Also, do not touch areas adjacent
to electrical contacts on connectors.

4-4

Table 4-2

Troubleshooting procedure

Step Item/component Required condition Comments

1

GND pad

2

+5V pad

3

U107, pin 6

4

U107, pin 5

5

U113, pin 7 and U104, pin 1

6

U113 and U104, pin 2

7

U113, pin 3 and U104, pin 9

8

U109-U113, pins 11-18

+5.3VDC
ID CLK pulses
ID DATA pulses
STROBE pulse
CLK pulses
DATA pulses
Low with output channel on;
high with output channel off.

All voltages referenced to digital ground
(GND pad).
Logic voltage.
During power-up only.
During power-up only.
End of update sequence.
During update sequence only.
During update sequence only.
Output channel driver outputs.

Service Information

4-5

Service Information

4-6

5

Replaceable Parts

5.1 Introduction

This section contains replacement parts information, sche­matic diagrams and component layout drawings for the
Model 7020.

5.2 Parts lists

Parts Lists for the various circuit boards are included in ta­bles integrated with the schematic diagrams and component
layout drawings. Parts are listed alphabetically in order of
circuit designation.

5.3 Ordering information

To place an order, or to obtain information concerning re­placement parts, contact your Keithley representative or the
factory. When ordering parts, be sure to include the follow­ing information:

1. Card model number 7020

2. Card serial number

3. Part description

4. Circuit designation (if applicable)

5. Keithley part number

5.4 Factory service

If the card is to returned to Keithley Instruments for repair,
perform the following:

• Call the Repair Department at 1-800-552-1115 for a
Return Material Authorization (RMA) number.

• Complete the service form at the back of this manual
and include it with the card.

• Carefully pack the card in the original packing carton.

• Write ATTENTION REPAIR DEPT and the RMA
number on the shipping label.

NOTE

It is not necessary to return the switching
mainframe with the card.

5.5 Component layouts and schematic diagrams

Component layout drawings and schematic diagrams are in­cluded on the following pages integrated with the parts lists:

Mass terminal board component layout: 7020-170

Mass terminal board schematic: 7020-176

Scanner board component layout: 7020-100

Scanner board schematic: 7020-106

5-1

Replaceable Parts

Table 5-1

Model 7020 mass terminal board, parts list

Circuit Desig. Description Keithley Part Number

C401-404
J1004
P1002,1003
R401-440
RT401-440

BRACKET SILKSCREENING
CONNECTOR SHIM
SHIELD

CAP., 1UF,20%,50V,CERAMIC
CONN, 96-PIN, 3 ROWS
CONNECTOR, 48-PIN, 3 ROWS
RES,10,5%,1/2W,COMPOSITION OR FILM
POLYSWITCH, PTC RESISTOR

7011-318-6A
7011-309A
7011-311A

C-365-.1
CS-514
CS-748-3
R-448-10
RT-17

Table 5-2

Model 7020 scanner board, parts list

Circuit Desig. Description Keithley Part Number

C100-105,107,108,110-117
C106,109

CR100-179
CR180

16-PIN SOCKET FOR TF-117
CONNECTOR, JUMPER FOR CS-339
SHIELD
CAP,.1UF,20%,50V,CERAMIC
CAP, 10UF,-20+100%,25V,ALUM ELEC

DIODE,SILICON,IN4148 (D0-35)
DIODE, 1N5404

SO-65
CS-476
7011-305C
C-365-.1
C-314-10

RF-28
RF-74

J1002,1003

P2001

R100-109,120-134,150-164
R110-119,135-149,165-179
R180-184
R185

U100-104
U105
U106
U107
U108
U109-113

VR100-104

W100-104
W105

** Order firm are revision of present ROM.

CONN, 48-PIN, 3-ROWS

CONNECTOR, 32-PIN, 2-ROWS

RES,10K,5%,1/4W,COMPOSITION OR FILM
RES,100K,5%,1/4W,COMPOSITION OR FILM
RES NET, 10K, .5%, 7W
RES,1K,5%,1/4W,COMPOSITION OR FILM

IC, 8-BIT PARALLEL TO SERIAL, 74HCT165
IC, QUAD 2 INPUT OR, 74HCT32
IC, HEX INVERTER, 74HCT04
ID ROM
IC, HIGH SPEED BUFFER, 74HC125
IC, 8-BIT SERIAL-IN-LATCH DRIVER, 5841A

DIODE, ZENER 5.1V,IN751(D0-7)

CONN, 3 PIN
JUMPER

CS-736-2

CS-775-1

R-76-10K
R-76-100K
TF-117
R-76-1K

IC-548
IC-443
IC-444
7020-800-**
IC-451
IC-536

DZ-59

CS-339-3
J-15

5-2

432

7020-170

NO.

A

PRELIMINARY

1

DATEENG.REVISIONECA NO.LTR.

B

D

J1004

D

C

RT425

RT439

RT437

RT435

RT433

RT431

RT429

RT427

C402

R413

R403

R406

R427

R417

R432

R423

R405

C401

R414

R410

R401

R422

R402

R428

R418

R436

R404

R409

R407

R411

RT432

RT430

RT428

RT426

RT440

RT438

RT436

RT420

RT419

RT434

RT418

RT417

RT409 RT408 RT407

RT410

RT411

RT412

RT414 RT413

RT416 RT415

C404

R420

R415

R425

R430

R437

R439

R429

R433

P1003P1002

C403

RT406

R416

RT404

R421

RT402

R431

R438

R434

R408

RT424RT423

R424

RT422RT421

R419

RT405

RT401

RT403

R412

R426

R435

R440

B

C

B

NOTE: FOR COMPONENT INFORMATION, SEE PRODUCT STRUCTURE.

QTY.NEXT ASSEMBLYMODEL

A

KEITHLEY

KEITHLEY INSTRUMENTS INC.

CLEVELAND, OHIO 44139

DIM ARE IN IN. UNLESS OTHERWISE NOTED

DIM. TOL. UNLESS OTHERWISE SPECIFIED

XX=+.01
XXX=+.005

ANG.=+1
FRAC.=+1/64

3/6/95 1:1

CAB

DO NOT SCALE THIS DRAWING

432

SCALEDATE

TITLE

APPR.DRN

B

COMPONENT LAYOUT,

MASS TERMINATED CARD

NO.

7020-170

1

USED ON

PG

A

Index

B

Block diagram 4-2

C

Card connections and installation 2-1
Card installation 2-3
Card removal 2-4
Channel assignments 3-2
Channel functionality test 4-1
Channel status display 3-1
Component layouts and schematic

diagrams 5-1

Controlling devices using pull-up

resistors 1-1
Controlling output channels 3-3
Controlling pull-up devices 1-1

D

Digital I/O configuration 1-1
Digital inputs 1-1
Digital outputs 1-1

F

I

ID data circuits 4-2
IEEE-488 bus operation 3-4
Input channel control 4-4
Input/output connections 2-4
Internal connections 2-1

O

Operation 3-1
Ordering information 5-1
Output channel control 4-3

M

Models 7020-D and 7020-DT 2-9

P

Parts lists 5-1
Power limits 3-1
Power-on safeguard 4-4
Principles of operation 4-2
Pull-up resistors 2-3

R

Reading input channels 3-4, 3-5
Replaceable parts 5-1

S

Scanning output channels 3-4, 3-5
Service information 4-1
Static-sensitive devices 4-2

T

Troubleshooting access 4-4
Troubleshooting procedure 4-4
Turning output channels On and

Off 3-3, 3-4
Typical connection techniques 2-6
Typical input connection scheme 2-9
Typical output connection schemes 2-7

V

Voltage source jumpers 2-1

Factory service 5-1

i-1

i-2

Service Form

Model No. Serial No. Date

Name and Telephone No.

Company

List all control settings, describe problem and check boxes that apply to problem.

❏ Intermittent ❏ Analog output follows display ❏ Particular range or function bad; specify

❏ IEEE failure ❏ Obvious problem on power-up ❏ Batteries and fuses are OK
❏ Front panel operational ❏ All ranges or functions are bad ❏ Checked all cables

Display or output (check one)

❏ Drifts ❏ Unable to zero
❏ Unstable ❏ Will not read applied input
❏ Overload

❏ Calibration only ❏ Certificate of calibration required
❏ Data required

(attach any additional sheets as necessary)

Show a block diagram of your measurement system including all instruments connected (whether power is turned on or not).
Also, describe signal source.

Where is the measurement being performed? (factory, controlled laboratory, out-of-doors, etc.)

What power line voltage is used? Ambient temperature? °F

Relative humidity? Other?

Any additional information. (If special modifications have been made by the user, please describe.)

Be sure to include your name and phone number on this service form.

Specifications are subject to change without notice.
All Keithley trademarks and trade names are the property of Keithley Instruments, Inc. All other

trademarks and trade names are the property of their respective companies.

Keithley Instruments, Inc. 28775 Aurora Road • Cleveland, Ohio 44139 • 440-248-0400 • Fax: [phone]

1-888-KEITHLEY (534-8453) www .keithley.com

BELGIUM: Keithley Instruments B.V. Bergensesteenweg 709 • B-1600 Sint-Pieters-Leeuw • 02/363 00 40 • Fax: [phone]
CHINA: Keithley Instruments China Yuan Chen Xin Building, Room 705 • 12 Yumin Road, Dewai, Madian • Beijing 100029 • 8610-6202-2886 • Fax: [phone]
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GREAT BRITAIN: Keithley Instruments Ltd. The Minster • 58 Portman Road • Reading, Berkshire RG30 1EA • 0118-9 57 56 66 • Fax: [phone]
INDIA: Keithley Instruments GmbH Flat 2B, WILLOCRISSA • 14, Rest House Crescent • Bangalore 560 001 • 91-80-509-1320/21 • Fax: [phone]
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TAIWAN: Keithley Instruments Taiwan 1FL., 85 Po Ai Street • Hsinchu, Taiwan, R.O.C. • 886-3-572-9077• Fax: [phone]

© Copyright 2000 Keithley Instruments, Inc. No. 2193
Printed in the U.S.A. 2/2000