National Instruments 6527 User manual

DAQ
6527 User Manual
Isolated Digital I/O Interface
for PCI, PXI , and CompactPCI
6527User Manual
™
August 2000 Edition
Part Number 322164B-01

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©Copyright 1999, 2000 National Instruments Corporation. All rights reserved.

Important Information
Warranty
The PCI-6527 and PXI-6527 devices are warranted against defects in materials and workmanship for a period of one year from
the date of shipment, as evidenced by receipts or other documentation. National Instruments will, at its option, repair or replace
equipment that proves to be defective during the warranty period. This warranty includes parts and labor.
The media on which you receive National Instruments software are warranted not to fail to execute programming instructions,
due to defects in materials and workmanship, for a period of 90 days from date of shipment, as evidenced by receipts or other
documentation. National Instruments will, at its option, repair or replace software media that do not execute programming
instructions if National Instruments receives notice of such defects during the warranty period. National Instruments does not
warrant that the operation of the software shall be uninterrupted or error free.
A Return Material Authorization (RMA) number must be obtained from the factory and clearly marked on the outside of
the package before any equipment will be accepted for warranty work. National Instruments will pay the shipping costs of
returning to the owner parts which are covered by warranty.
National Instruments believes that the information in this document is accurate. The document has been carefully reviewed
for technical accuracy. In the event that technical or typographical errors exist, National Instruments reserves the right to
make changes to subsequent editions of this document without prior notice to holders of this edition. The reader should consult
National Instruments if errors are suspected. In no event shall National Instruments be liable for any damages arising out of
or related to this document or the information contained in it.
EXCEPT AS SPECIFIED HEREIN,NATIONAL INSTRUMENTS MAKES NO WARRANTIES,EXPRESS OR IMPLIED,AND SPECIFICALLY DISCLAIMS ANY
WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.CUSTOMER’S RIGHT TO RECOVER DAMAGES CAUSED BY FAULT OR
NEGLIGENCE ON THE PART OF NATIONAL INSTRUMENTS SHALL BE LIMITED TO THE AMOUNT THERETOFORE PAID BY THE CUSTOMER.NATIONAL
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apply regardless of the form of action, whether in contract or tort, including negligence. Any action against National Instruments
must be brought within one year after the cause of action accrues. National Instruments shall not be liable for any delay in
performance due to causes beyond its reasonable control. The warranty provided herein does not cover damages, defects,
malfunctions, or service failures caused by owner’s failure to follow the National Instruments installation, operation, or
maintenance instructions; owner’s modification of the product; owner’s abuse, misuse, or negligent acts; and power failure or
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™,Measure ™, Measurement Studio™,MITE ™, National Instruments™,ni.com ™, NI-DAQ™,andPXI ™are
trademarks of National Instruments Corporation.
Product and company names mentioned herein are trademarks or trade names of their respective companies.
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OF RELIABILITY SUITABLE FOR USE IN OR IN CONNECTION WITH SURGICAL IMPLANTS OR AS CRITICAL
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CREATE A RISK OF HARM TO PROPERTY OR PERSONS (INCLUDING THE RISK OF BODILY INJURY AND DEATH)
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FAILURE. TO AVOID DAMAGE, INJURY, OR DEATH, THE USER OR APPLICATION DESIGNER MUST TAKE
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SAFETY LEVEL OF SUCH SYSTEM OR APPLICATION.

©National Instruments Corporation v 6527 User Manual
Contents
About This Manual
How To Use the Manual Set..........................................................................................vii
Conventions ...................................................................................................................viii
Related Documentation..................................................................................................viii
Chapter 1
Getting Started with Your 6527
About the 6527 Device ..................................................................................................1-1
Using PXI with CompactPCI.........................................................................................1-2
What You Need to Get Started ......................................................................................1-2
Software Programming Choices ....................................................................................1-3
National Instruments Application Software ....................................................1-3
NI-DAQ Driver Software ................................................................................1-3
Optional Equipment.......................................................................................................1-4
Custom Cabling .............................................................................................................1-5
Safety Information .........................................................................................................1-5
Unpacking......................................................................................................................1-6
Chapter 2
Installing and Configuring the 6527
Installing Software.........................................................................................................2-1
Installing the 6527 .........................................................................................................2-1
Configuring the 6527 .....................................................................................................2-3
Chapter 3
Making Signal Connections
I/O Connector ................................................................................................................3-1
Cable Assembly Connectors............................................................................3-3
I/O Connector Signal Descriptions..................................................................3-5
Power Connections ........................................................................................................3-6
Isolation Voltages ..........................................................................................................3-7
Optically Isolated Inputs ................................................................................................3-7
Input Channels.................................................................................................3-7
Sensing DC Voltages.......................................................................................3-8
Signal Connection Example ............................................................................3-8
Reducing the Forward Current for High Voltages ..........................................3-9
Solid-State Relay Outputs..............................................................................................3-10

Contents
6527 User Manual vi ni.com
Output Channels.............................................................................................. 3-10
Overcurrent Protection.................................................................................... 3-12
Power-on and Power-off Conditions............................................................... 3-13
Chapter 4
Using the 6527
Functional Overview ..................................................................................................... 4-1
PCI Interface Circuitry.................................................................................... 4-2
Digital I/O Circuitry........................................................................................ 4-3
Optical Isolation Circuitry .............................................................................. 4-3
Digital Filtering ............................................................................................................. 4-3
Change Notification....................................................................................................... 4-5
Appendix A
Specifications
Appendix B
Technical Support Resources
Glossary
Index

©National Instruments Corporation vii 6527 User Manual
About This Manual
This manual describes the electrical and mechanical aspects of the
6527devices, and contains information concerning their operation and
programming.
How To Use the Manual Set
The 6527 User Manual is one piece of the documentation set for your
data acquisition system. You could have any of several types of manuals,
depending on the hardware and software in your system. Use the manuals
you have as follows:
•Your DAQ hardware user manuals—These manuals have detailed
information about the DAQ hardware that plugs into or is connected
to your computer. Use these manuals for hardware installation and
configuration instructions, specification information about your
DAQ hardware, and application hints.
•Software documentation—Examples of software documentation you
may have are the LabVIEW or Measurement Studio documentation
sets and the NI-DAQ documentation. After you set up your
hardware system, use either the application software or the NI-DAQ
documentation to help you write your application. If you have a large
and complicated system, it is worthwhile to look through the software
documentation before you configure your hardware.
•Accessory installation guides or manuals—If you are using accessory
products, read the terminal block and cable assembly installation
guides or accessory board user manuals. They explain how to
physically connect the relevant pieces of the system. Consult these
guides when you are making your connections.

About This Manual
6527 User Manual viii ni.com
Conventions
The following conventions appear in this manual:
<> Angle brackets that contain numbers separated by an ellipsis represent a
range of values associated with a bit or signal name—for example,
DIG+0.<3..0>.
♦The ♦symbol indicates that the text following it applies only to a specific
product, a specific operating system, or a specific software version.
This icon denotes a note, which alerts you to important information.
This icon denotes a caution, which advises you of precautions to take to
avoid injury, data loss, or a system crash.
This icon denotes a warning, which advises you of precautions to take to
avoid being electrically shocked.
italic Italic text denotes variables, emphasis, a cross reference, or an introduction
to a key concept. This font also denotes text that is a placeholder for a word
or value that you must supply.
monospace Text in this font denotes text or characters that you should enter from the
keyboard, sections of code, programming examples, and syntax examples.
This font is also used for the proper names of disk drives, paths, directories,
programs, subprograms, subroutines, device names, functions, operations,
variables, filenames and extensions, and code excerpts.
Related Documentation
The following documents also contain information that you may find
helpful as you read this manual:
•Your computer’s technical reference manual
•PCI Local Bus Specification,Revision2.0
•National Instruments PXI Specification, Revision 1.0
• PICMG 2.0 R2.1 CompactPCI

©National Instruments Corporation 1-1 6527 User Manual
1
Getting Started with Your 6527
This chapter describes the 6527 devices, lists what you need to get started,
software programming choices, and optional equipment, describes custom
cabling options, and explains how to unpack your board.
About the 6527 Device
Thank you for purchasing a National Instruments 6527 device. Unless
otherwise noted, the text applies to all devices in the 6527 family, which
includes the PCI-6527 and PXI-6527. The 6527 devices are 48-bit, parallel,
isolated digital I/O interfaces for PCI bus computers and PXI or Compact
PCI chassis. The 6527 devices offer 48 channels of isolated digital data
acquisition. Twenty-four of the channels are optocoupler inputs and 24 are
solid-state relay outputs. You can sense digital levels up to 28 VDC and
switch currents of up to 120 mA. Digital filtering is available to eliminate
glitches on the input lines. All input lines can also generate interrupts on
rising or falling edges to notify you of changing data.
The 6527 device is a completely jumperless DAQ device for PCI buses
and PXI or CompactPCI chassis and contains the National Instruments
PCI MITE interface.
The 6527 devices are ideal for low-voltage isolation and switching in both
industrial and laboratory environments. You can use the optically-isolated
digital input lines to read the status of external digital logic at TTL and
non-TTL levels. You can use the solid-state relay outputs to switch external
devices, including those requiring high input currents, and to control digital
logic levels at both TTL and non-TTL levels. Because of the isolated nature
of the 6527 devices, you can decouple the noise and harsh ground of the
computer from external signals, and vice versa.
Detailed 6527 device specifications are in Appendix A, Specifications.

Chapter 1 Getting Started with Your 6527
6527 User Manual 1-2 ni.com
Using PXI with CompactPCI
Using PXI-compatible products with standard CompactPCI products is an
important feature provided by the PXI Specification, Revision 1.0. If you
use a PXI-compatible plug-in device in a standard CompactPCI chassis,
you will be unable to use PXI-specific functions, but you can still use the
basic plug-in device functions.
The CompactPCI specification permits vendors to develop sub-buses that
coexist with the basic PCI interface on the CompactPCI bus. Compatible
operation is not guaranteed between CompactPCI devices with different
sub-buses nor between CompactPCI devices with sub-buses and PXI.
The standard implementation for CompactPCI does not include these
sub-buses. Your 6527 device will work in any standard CompactPCI
chassis adhering to the PICMG 2.0 R2.1 CompactPCI core specification.
What You Need to Get Started
To set up and use your 6527 device, you will need the following:
❑One of the following devices:
–PCI-6527
–PXI-6527
❑6527 User Manual
❑One or more of the following software packages and documentation:
–LabVIEW for Windows
–Measure
–Measurement Studio
–NI-DAQ for PC Compatibles
❑Your computer, or PXI or CompactPCI chassis and controller

Chapter 1 Getting Started with Your 6527
©National Instruments Corporation 1-3 6527 User Manual
Software Programming Choices
There are several options to choose from when programming your
National Instruments DAQ hardware. You can use LabVIEW,
LabWindows/CVI, Visual C++, or Visual Basic with the NI-DAQ
driver software.
National Instruments Application Software
LabVIEW features interactive graphics, a state-of-the-art user interface,
and a powerful graphical programming language. The LabVIEW Data
Acquisition VI Library, a series of VIs for using LabVIEW with National
Instruments DAQ hardware, is included with LabVIEW. The LabVIEW
Data Acquisition VI Library is functionally equivalent to the
NI-DAQ software.
Measurement Studio, which includes LabWindows/CVI and tools for
Visual C++ and Visual Basic, features interactive graphics, user interface
controls, and data acquisition through standard ANSI C functions and
ActiveX controls. With Measurement Studio, you can use all of the
configuration tools, resource management utilities, and interactive
control utilities included with NI-DAQ.
Using LabVIEW or Measurement Studio software will greatly reduce
the development time for your data acquisition and control application.
NI-DAQ Driver Software
The NI-DAQ driver software is included at no charge with all
National Instruments DAQ hardware. NI-DAQ has an extensive library
of functions that you can call from your application programming
environment. These functions allow you to use all features of your
6527 device.
NI-DAQ addresses many of the complex issues between the computer and
the DAQ hardware such as programming interrupts. NI-DAQ maintains a
consistent software interface among its different versions so that you can
change platforms with minimal modifications to your code. Whether you
are using LabVIEW or Measurement Studio, your application uses the
NI-DAQ driver software, as illustrated in Figure 1-1.

Chapter 1 Getting Started with Your 6527
6527 User Manual 1-4 ni.com
Figure 1-1. The Relationship between the Programming Environment,
NI-DAQ, and Your Hardware
Optional Equipment
National Instruments offers a variety of accessories to use with your
6527 device, such as:
•Cables and cable assemblies, shielded and ribbon
•Connector blocks, unshielded and shielded 50- and 100-pin
screw terminals
For more information about optional equipment available from
National Instruments, refer to your National Instruments catalogue,
or call the office nearest to you.
LabVIEW
or
Measurement Studio
Conventional
Programming Environment
NI-DAQ
Driver Software
DAQ or
SCXI Hardware
Personal
Computer or
Workstation

Chapter 1 Getting Started with Your 6527
©National Instruments Corporation 1-5 6527 User Manual
Custom Cabling
National Instruments offers cables and accessories for you to prototype
your application or to use if you frequently change board interconnections.
If you want to develop your own cable, note that the 6527 device uses a
100-pin female cable header. AMP Corporation part number 749621-9 may
be used for the mating connector. Backshells available for use on a cable
with this connector include the following:
•AMP 749081-1
•AMP 749854-1
These backshells have a different thread width than the I/O connector on
the 6527. A jackscrew to adapt the different thread widths is available from
National Instruments; the part number is 745444-01.
Safety Information
Cautions Do not operate the 6527 in an explosive atmosphere or where there may be
flammable gases or fumes.
Do not operate the 6527 in a manner not specified in the manual.
Clean the 6527 and accessories by brushing off light dust with a soft nonmetallic brush.
Remove other contaminants with a stiff nonmetallic brush. The unit must be completely
dry and free from contaminants before returning it to service.
Connections, including power-signal-to-ground and ground-to-power-signal, that exceed
any of the maximum signal ratings for the 6527 can damage any or all of the modules in
the same PXI or CompactPCI chassis, or PCI-bus computer. National Instruments is not
liable for any damages or injuries resulting from incorrect signal connections.
All signal wiring must be properly insulated. National Instruments is not liable for damage
to equipment or injuries caused by improper signal wiring.
The 6527 must be used in a CE-marked PXI or CompactPCI chassis, or PCI-bus computer.

Chapter 1 Getting Started with Your 6527
6527 User Manual 1-6 ni.com
Unpacking
Your 6527 device is shipped in an antistatic package to prevent electrostatic
damage to the board. Electrostatic discharge can damage several
components on the board. To avoid such damage in handling the board,
take the following precautions:
•Ground yourself via a grounding strap or by holding a grounded object.
•Touch the antistatic package to a metal part of your computer chassis
before removing the board from the package.
•Remove the board from the package and inspect the board for loose
components or any other sign of damage.
•Never touch the exposed pins of connectors.
Note Notify National Instruments if the board appears damaged in any way. Do not install
a damaged board into your computer.

©National Instruments Corporation 2-1 6527 User Manual
2
Installing and Configuring
the 6527
This chapter describes how to install and configure your 6527 device.
Installing Software
This section describes how to install your software.
Note Install your software before you install your 6527 device.
If you are using NI-DAQ, refer to your NI-DAQ release notes for specific
instructions on the software installation sequence. Find the installation
section for your operating system and follow the instructions given there.
If you are using LabVIEW, LabWindows/CVI, or other National
Instruments application software packages, refer to the appropriate release
notes for exact directions on installing your software. After you have
installed your application software, refer to your NI-DAQ release notes
and follow the instructions given there for your operating system and
application software package.
Installing the 6527
This section describes how to install your hardware.
Note Install your software before you install your 6527 device.
The following are general installation instructions for each device. Consult
your computer or chassis user manual or technical reference manual for
specific instructions about installing new devices in your computer or
chassis.
Note Follow the guidelines in your computer documentation for installing plug-in
hardware.

Chapter 2 Installing and Configuring the 6527
6527 User Manual 2-2 ni.com
♦PCI-6527
To install a PCI-6527 in any available 5 V PCI expansion slot in
your computer:
1. Turn off and unplug your computer.
2. Remove the top cover or access port to the expansion slots.
3. Make sure there are no lighted LEDs on your motherboard. If any are
lit, wait until they go out before continuing your installation.
4. Remove the expansion slot cover on the back panel of the computer.
5. Ground yourself via a grounding strap or by holding a grounded object.
Follow the ESD protection precautions described in the Unpacking
section of Chapter 1, Getting Started with Your 6527.
6. Insert the PCI-6527 in a 5 V PCI slot. It may be a tight fit, but do not
force the device into place.
7. Screw the mounting bracket of the PCI-6527 to the back panel rail of
the computer.
8. Visually verify the installation.
9. Replace the top cover of your computer.
10. Plug in and turn on your computer.
♦PXI-6527
To install a PXI-6527 in any available 5 V peripheral slot in your PXI
or CompactPCI chassis:
1. Turn off and unplug your PXI or CompactPCI chassis.
2. Choose an unused PXI or CompactPCI 5 V peripheral slot.
3. Make sure there are no lighted LEDs on your motherboard. If any are
lit, wait until they go out before continuing your installation.
4. Remove the filler panel for the peripheral slot you have chosen.
5. Ground yourself via a grounding strap or by holding a grounded object.
Follow the ESD protection precautions described in the Unpacking
section of Chapter 1, Getting Started with Your 6527.
6. Insert the PXI-6527 in the selected 5 V slot. Use the injector/ejector
handle to fully inject the device into place.
7. Screw the front panel of the PXI-6527 to the front panel mounting rails
of the PXI or CompactPCI chassis.
8. Visually verify the installation.
9. Plug in and turn on the PXI or CompactPCI chassis.

Chapter 2 Installing and Configuring the 6527
©National Instruments Corporation 2-3 6527 User Manual
Your 6527 is now installed. You are now ready to configure your hardware
and software.
Configuring the 6527
Your 6527 device is completely software configurable, and you do
not need to perform any configuration steps after the system powers up.
The PCI-6527 is fully compliant with the PCI Local Bus Specification,
Revision 2.0, and the PXI-6527 is fully compliant with the PXI
Specification, Revision 1.0. Therefore, all board resources are
automatically allocated by the PCI system, including the base
address and interrupt level. The board’s base address is mapped
into PCI memory space.

©National Instruments Corporation 3-1 6527 User Manual
3
Making Signal Connections
This chapter describes the pin arrangement, signal names, and signal
connections on your 6527 device.
Caution Connections that exceed any of the maximum ratings of input or output signals
on your 6527 device can damage the board and your computer. Pay careful attention to
the maximum input ratings included with the description of each signal in this chapter.
National Instruments is not liable for any damages resulting from signal connections that
exceed these maximum ratings.
I/O Connector
The I/O connector for the 6527 device has 100 pins that you can connect to
50-pin accessories with the R1005050 cable or to 100-pin accessories with
the shielded SH100100-F cable. Figure 3-1 shows the pin assignments for
the 6527 I/O connector. A signal description follows the figure.

Chapter 3 Making Signal Connections
6527 User Manual 3-2 ni.com
Note For input ports, connect the higher voltage to the DIG+ pin and the lower voltage to
the DIG–pin. For output ports, you can connect signals to the two pins of each line without
regard to which voltage is higher. The output lines consist of solid-state relays and act as
bidirectional switches.
Figure 3-1. 6527 Connector Pin Assignments
50 100
49 99
48 98
47 97
46 96
45 95
44 94
43 93
42 92
41 91
40 90
39 89
38 88
37 87
36 86
35 85
34 84
33 83
32 82
31 81
30 80
29 79
28 78
27 77
26 76
25 75
24 74
23 73
22 72
21 71
20 70
19 69
18 68
17 67
16 66
15 65
14 64
13 63
12 62
11 61
10 60
959
858
757
656
555
454
353
252
151
GND GND
+5 V +5 V
DIG–0.0 DIG–3.0
DIG+0.0 DIG+3.0
DIG–0.1 DIG–3.1
DIG+0.1 DIG+3.1
DIG–0.2 DIG–3.2
DIG+0.2 DIG+3.2
DIG–0.3 DIG–3.3
DIG+0.3 DIG+3.3
DIG–0.4 DIG–3.4
DIG+0.4 DIG+3.4
DIG–0.5 DIG–3.5
DIG+0.5 DIG+3.5
DIG–0.6 DIG–3.6
DIG+0.6 DIG+3.6
DIG–0.7 DIG–3.7
DIG+0.7 DIG+3.7
DIG–1.0 DIG–4.0
DIG+1.0 DIG+4.0
DIG–1.1 DIG–4.1
DIG+1.1 DIG+4.1
DIG–1.2 DIG–4.2
DIG+1.2 DIG+4.2
DIG–1.3 DIG–4.3
DIG+1.3 DIG+4.3
DIG–1.4 DIG–4.4
DIG+1.4 DIG+4.4
DIG–1.5 DIG–4.5
DIG+1.5 DIG+4.5
DIG–1.6 DIG–4.6
DIG+1.6 DIG+4.6
DIG–1.7 DIG–4.7
DIG+1.7 DIG+4.7
DIG–2.0 DIG–5.0
DIG+2.0 DIG+5.0
DIG–2.1 DIG–5.1
DIG+2.1 DIG+5.1
DIG–2.2 DIG–5.2
DIG+2.2 DIG+5.2
DIG–2.3 DIG–5.3
DIG+2.3 DIG+5.3
DIG–2.4 DIG–5.4
DIG+2.4 DIG+5.4
DIG–2.5 DIG–5.5
DIG+2.5 DIG+5.5
DIG–2.6 DIG–5.6
DIG+2.6 DIG+5.6
DIG–2.7 DIG–5.7
DIG+2.7 DIG+5.7
Input Output with Readback

Chapter 3 Making Signal Connections
©National Instruments Corporation 3-3 6527 User Manual
Cable Assembly Connectors
The optional R1005050 cable assembly you can use with the 6527 device
is an assembly of two 50-pin cables and three connectors. Both cables are
joined to a single connector on one end and to individual connectors on the
free ends. The 100-pin connector that joins the two cables plugs into the
I/O connector of the 6527 device. The other two connectors are 50-pin
connectors, one of which is connected to pins 1 through 50 and the other to
pins 51 through 100 of the 6527 device connector. Figure 3-2 shows the pin
assignments for the 50-pin connectors on the cable assembly.
Table 3-1. Port Functionality for 6527 Devices
Port Function
0Input
1Input
2Input
3Output with readback
4Output with readback
5Output with readback

Chapter 3 Making Signal Connections
6527 User Manual 3-4 ni.com
Figure 3-2. Cable-Assembly Connector Pinout for the R1005050 Ribbon Cable
+5 V
DIG+0.0
DIG+0.1
DIG+0.2
DIG+0.3
DIG+0.4
DIG+0.5
DIG+0.6
DIG+0.7
DIG+1.0
DIG+1.1
DIG+1.2
DIG+1.3
DIG+1.4
DIG+1.5
DIG+1.6
DIG+1.7
DIG+2.0
DIG+2.1
DIG+2.2
DIG+2.3
DIG+2.4
DIG+2.5
DIG+2.6
DIG+2.7
GND
DIG–0.1
DIG–0.2
DIG–0.4
DIG–0.5
DIG–0.6
DIG–0.7
DIG–0.0
DIG–0.3
DIG–1.0
DIG–1.1
DIG–1.2
DIG–1.3
DIG–1.4
DIG–1.5
DIG–1.6
DIG–1.7
DIG–2.0
DIG–2.1
DIG–2.2
DIG–2.3
DIG–2.4
DIG–2.5
DIG–2.6
DIG–2.7
49 50
47 48
45 46
43 44
41 42
39 40
37 38
35 36
33 34
31 32
29 30
27 28
25 26
23 24
21 22
19 20
17 18
15 16
13 14
11 12
910
78
56
34
12
+5 V
DIG+3.0
DIG+3.1
DIG+3.2
DIG+3.3
DIG+3.4
DIG+3.5
DIG+3.6
DIG+3.7
DIG+4.0
DIG+4.1
DIG+4.2
DIG+4.3
DIG+4.4
DIG+4.5
DIG+4.6
DIG+4.7
DIG+5.0
DIG+5.1
DIG+5.2
DIG+5.3
DIG+5.4
DIG+5.5
DIG+5.6
DIG+5.7
GND
DIG–3.1
DIG–3.2
DIG–3.4
DIG–3.5
DIG–3.6
DIG–3.7
DIG–3.0
DIG–3.3
DIG–4.0
DIG–4.1
DIG–4.2
DIG–4.3
DIG–4.4
DIG–4.5
DIG–4.6
DIG–4.7
DIG–5.0
DIG–5.1
DIG–5.2
DIG–5.3
DIG–5.4
DIG–5.5
DIG–5.6
DIG–5.7
99 100
97 98
95 96
93 94
91 92
89 90
87 88
85 86
83 84
81 82
79 80
77 78
75 76
73 74
71 72
69 70
67 68
65 66
63 64
61 62
59 60
57 58
55 56
53 54
51 52
Input Output with Readback