Pickering SYSTEM 10 User manual

Page (1)
SWITCHING MATRIX MODULE 20-517A/518A
pickering
Issue 3.1 July 2019
User Manual
GPIB Switching Matrix Module
(Model No. 20-517A/518A)
pickeringtest.com pickering
SYSTEM 10/20
*Please contact Pickering for alternative
PXI/LXI/USB solutions
*

Page (II) SWITCHING MATRIX MODULE 20-517A/518A
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Page (II) REED RELAY MODULE 40-110/115/120/125
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© COPYRIGHT (2019) PICKERING INTERFACES. ALL RIGHTS RESERVED.
No part of this publication may be reproduced, transmitted, transcribed, translated or stored in any form, or by
any means without the written permission of Pickering Interfaces.
Technical details contained within this publication are subject to change without notice.
ISO 9001
Reg No. FM38792

Page (III)
SWITCHING MATRIX MODULE 20-517A/518A
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Page (III)
REED RELAY MODULE 40-110/115/120/125
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TECHNICAL SUPPORT
For Technical Support please contact Pickering Interfaces either by phone, the website or via e-mail.
WARRANTY
All products manufactured by Pickering Interfaces are warranted against defective materials and workmanship for a period of
three years, excluding programmable power supplies, from the date of delivery to the original purchaser. Any product found to be
defective within this period will, at the discretion of Pickering Interfaces be repaired or replaced.
Products serviced and repaired outside of the warranty period are warranted for ninety days.
Extended warranty and service are available. Please contact Pickering Interfaces by phone, the website or via e-mail.
ENVIRONMENTAL POLICY
Pickering Interfaces operates under an environmental management system similar to ISO 14001.
Pickering Interfaces strives to full all relevant environmental laws and regulations and reduce wastes and releases to the
environment. Pickering Interfaces aims to design and operate products in a way that protects the environment and the health and
safety of its employees, customers and the public. Pickering Interfaces endeavours to develop and manufacture products that can
be produced, distributed, used and recycled, or disposed of, in a safe and environmentally friendly manner.
Worldwide Technical Support and Product Information
pickeringtest.com
Germany
Tel: [phone]
E-mail: [email protected]
Sweden
Tel: [phone]
E-mail: [email protected]
USA
Tel: (West) [phone]
Tel: (East) [phone]
E-mail: [email protected]
Czech Republic
Tel: [phone]
E-mail: [email protected]
France
Tel [phone]
E-mail [email protected]
Pickering Interfaces Headquarters
Stephenson Road Clacton-on-Sea CO15 4NL United Kingdom
Tel: [phone]
E-Mail: [email protected]
China
Tel: [phone]
E-mail: [email protected]

Page (IV) SWITCHING MATRIX MODULE 20-517A/518A
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Page (IV) GENERAL PURPOSE REED RELAY MODULE 10-110/115/120/125
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Page (IV) REED RELAY MODULE 40-110/115/120/125
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MEANING / DESCRIPTION SYMBOL
PROTECTIVE EARTH (GROUND)
To identify any terminal which is intended for connection to an external conductor for
protection against electric shock in case of a fault, or the terminal of a protective earth
(ground) electrode.
DANGEROUS VOLTAGE
To indicate hazards arising from dangerous voltages.
WARNING / CAUTION
An appropriate safety instruction should be followed or caution to a potential hazard
exists.
Refer to the relevant instructions detailed within the product manual.
HEAVY
If this product is heavy reference should be made to the safety instructions for
provisions of lifting and moving.
STATIC SENSITIVE
To indicate that static sensitive devices are present and handling precautions should
be followed.
!
kg
SAFETY SYMBOLS
PRODUCT SAFETY
The following safety symbols may be used on the product and throughout the product documentation.

Page (V)
SWITCHING MATRIX MODULE 20-517A/518A
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Copyright Statement ...................................................................II
Technical Support and Warranty................................................III
Product Safety .............................................................................IV
Contents (this page)....................................................................V
Warnings and Cautions ..............................................................VII
Section 1
Technical Specication...............................................................1.1
Section 2
Technical Description .................................................................2.1
Functional Description..........................................................2.1
Section 3
Installation....................................................................................3.1
Pre-Operation Checks...........................................................3.1
Hardware Installation ............................................................3.1
Software Installation .............................................................3.3
Self-Test..................................................................................3.4
Section 4
Programming Guide....................................................................4.1
Programming the Module .....................................................4.1
Section 5
Connector Information................................................................5.1
Section 6
Trouble Shooting.........................................................................6.1
Installation Problems ...........................................................6.1
Section 7
Maintenance Information............................................................7.1
Relay Lookup Tables.............................................................7.1
PCB and Component Layout................................................7.6
CONTENTS
Please use the hyperlinked text to navigate to the page required

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Page (VII)
SWITCHING MATRIX MODULE 20-517A/518A
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Page (VII)
GENERAL PURPOSE REED RELAY MODULE 10-110/115/120/125
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WARNINGS AND CAUTIONS
WARNING - HAZARDOUS ENVIRONMENTS SYMBOL
This product is not specically designed for use in hazardous environments, for example in explosive
atmospheres. If the product is to be used in hazardous environments we recommend that the user
ensures suitable protective measures are taken.
!
WARNING - DANGER OF ELECTRIC SHOCK SYMBOL
This module may contain hazardous voltages. Before removing the module from the rack remove all
supplies and disconnect user I/O signals.
Unused slots in the System 10/20 chassis are populated with blanking plates to prevent access
to user I/O signals that may be present. Blanking panels are available to order from Pickering in a
variety of slot widths. If the product is not used in this manner for example by using an extender card
then additional care must be taken to avoid contact with exposed signals.
CAUTION - HANDLING OF ELECTROSTATIC-SENSITIVE DEVICES SYMBOL
Certain semiconductor devices used in this equipment are liable to damage due to static voltage.
Observe the following precautions when handling these devices in their unterminated state, or
sub-assemblies containing these devices:
1. Persons removing sub-assemblies from equipment using these devices must be earthed by a
wrist strap and a resistor at the point provided on the equipment.
2. Soldering irons used during the repair operations must be low voltage types with earthed tips and
isolated from the mains voltage by a double insulated transformer.
3. Outer clothing worn must be unable to generate static charges.
4. Printed Circuit Boards (PCBs) tted with these devices must be stored and transported in
anti-static bags.
CAUTION - PRODUCT DOCUMENTATION SYMBOL
Suitably qualied & trained users should ensure that the accompanying documentation is fully read
and understood before attempting to install or operate the product.
!
SAFETY INSTRUCTIONS
SAFETY INSTRUCTIONS
All cleaning and servicing requires the equipment to be isolated and disconnected from the power source and user I/O
signals (refer to the Maintenance Section).
• Appropriate manual handling procedures should be followed as dictated by the weight of the individual module or
the combined weight of the modules & chassis.
• Should a fault occur with the module or chassis, immediately isolate and disconnect the incoming power to the
chassis and the user I/O signals.
• Ensure the equipment is installed, operated and maintained by trained and authorised personnel.

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Page 1.1
SWITCHING MATRIX MODULE 20-517A/518A
pickering SECTION 1 - TECHNICAL SPECIFICATION
SECTION 1 - TECHNICAL SPECIFICATION
pickeringtest.com
GPIB Switching Matrix Module 20-518A
ISSUE 5.2 JUL 2019
• 20 x 4 Matrix Formats with 1 or 2 Pole
Switching
• Modules Cascadable to Any Size Using
Internal 24-Pole Analogue Bus
• Automatic Isolation Switching
• Built-In Switch Self Test
• Switch up to 100 Volts DC, 0.5 Amps (1.2A
carry), 20W Max Power
• Ruthenium Reed Relays For Maximum
Switching Performance
Y 2Y4
X 1
X 4
Isolation
Switch
Y 1Y3
X 2
X 3
X 5
X 6
X 7
X 18
X 8
Matrix
Crosspoint
X 19
X 20
Isolation
Switching Diagram for the 20 x 4 Matrix Module,
Available With 1 or 2 Pole Switching
Modules 20-518A are matrix modules arranged in a 20 x 4
conguration with either 1 or 2 pole switching. Intended for easy
construction of small to medium sized matrix switching systems.
Connections are made via front panel mounted connectors. Larger
matrices may be constructed using the internal analogue bus.
Isolation Switches on each module remove all unused columns and
rows from the system, hence keeping interconnection capacitance
and leakage to an absolute minimum.
Automatic Self-Test
Full Self-Test is performed at power up, via a front panel switch or
under program control. Self-Test is of particular importance in large
systems where relay contact integrity is a very major consideration.
In the unlikely event of relay failure (either high on-state or low off-
state resistance) the front panel will indicate a fault. The diagnosis
- including the position of the suspect relay - will be indicated using
the DIAGNOSTIC? command.
Creating Larger Matrices - Easily!
Each System 20 interface can directly support matrices with
over 5000 crosspoints. Larger sizes are supported using multiple
System 20 interface modules.
Very large matrices are constructed by interconnecting two or
more matrix modules. All such matrix modules must have the same
primary address. Their position within the matrix is determined by
their bank address, this is set on an additional 5 way dip switch.
Both the X and Y axes have on-board automatic isolation
switches. In large matrix systems the parasitic capacitance
and leakage associated with each crosspoint switch can result
in a signicant degradation if several matrix modules are
interconnected. The isolation switches only switch in those columns
and rows on a module that contain an active switch. Thereby
keeping matrix capacitance to a minimum.
These isolation switches are also used to remove the matrix from
the external circuit when performing self-test.
A shielded 24 pole analogue bus is provided on the System 20
Analogue Backplane so constructing large matrices is very straight
forward, no time consuming daisy-chained wiring harnesses etc.
Pickering can build large Matrix systems constructed and tested to
your exact requirements, please contact the sales ofce for further
details.
*Please contact Pickering for alternative
PXI/LXI/USB solutions
*

Page 1.2 SWITCHING MATRIX MODULE 20-517A/518A
pickering
SECTION 1 - TECHNICAL SPECIFICATION
Switching Matrix Module – 20-518A
pickeringtest.com
Specifications
Switching Specification
Max Voltage:
Max Power:
Max Switch Current:
Max Carry Current:
100V DC
20W
0.5A
1.2A
On Path Resistance:
Off Path Resistance:
Differential Thermal Offset:
<500mΩ
>108Ω
<20µV
Capacitance
Open Channel to Ground:
Selected Channel to Ground:
Open Input to Ground:
<40pF
<70pF
<4pF
Bandwidth:
Isolation (at 1MHz):
Crosstalk (at 1MHz):
5MHz
>55dB
>55dB
Switching Time: 15ms
Expected Life (Low power):
Expected Life (Full power):
>1x108 operations
>5x106 operations
Safety & CE Compliance
All modules are fully CE compliant and meet applicable EU
directives: Low-voltage safety EN61010-1:2010, EMC Immunity
EN61326-1:2013, Emissions EN55011:2009+A1:2010.
Operating/Storage Conditions
Operating Conditions
Operating Temperature:
Humidity:
Altitude:
0°C to +55°C
Up to 95% non-condensing
5000m
Storage and Transport Conditions
Storage Temperature:
Humidity:
Altitude:
-20°C to +75°C
Up to 95% non-condensing
15000m
Programming
The matrix module is very easy to program using the Intelligent
IEEE-488.2 Interface:
ARESET a Open all switches on device a
DIAGNOSTIC? Report any Self Test errors
DELAY t Force a minimum delay of tmilliseconds
between two instructions
MCLOSE a,x,y Close switch at coordinates x,y on matrix
a
MOPEN a,x,y Open switch at coordinates x,y on matrix
a
RESET Open all switches on all modules
VIEW? a View status of device a
Further matrix control may be achieved using the IEEE-488.2
stored settings commands (*SAV/*RCL), these permit the
storage and later recall of complex matrix congurations.
Reed Switch Type
Ruthenium Electro-Plated Reed Relays offer maximum
performance, they are hermetically sealed and offer a very stable,
long life relay contact (over 108 operations) with fast operate time.
Alternative types such as electro-mechanical armature relays are
lower cost but do not offer the consistent contact resistance, long
life, fast switching speed and low level switching capability of a
Ruthenium reed relay.
All reed relays are manufactured by our sister company Pickering
Electronics: pickeringrelay.com
Connectors
Matrix connection is via a high quality 96-Pin Rectangular
Multipole
Connector (ZIF type), this is pin compatible
with appropriate
modules in the 20-510A & 20-515A range.
Mechanical Characteristics
All 20-518A model versions are housed in a shielded 6U height
(262mm) Eurocard module and are 160mm deep. Panel width for
all versions is 1.8 Inches.
Self Test Details
Self-Test is invoked at power on (taking up to 60 seconds) and
may also be operated under software (*TST?) or via a recessed
push button. Self-Test pass is indicated on a front panel LED with
a full pass/fail description available using the DIAGNOSTIC?
command. Self-Test comprises 3 levels:-
1. Logic Test
2. Relay Coil Test
3. Full Contact Test
Mixed Matrix/Multiplexers Configurations
For some users requiring very large matrix systems the cost of a
“full” matrix may prove prohibitive, in many instances a combination
of multiplexer input/output and partially lled matrix may prove quite
acceptable and could prove to be more effective in terms of both
cost and performance. Please contact Pickering to discuss your
application in detail.

Page 1.3
SWITCHING MATRIX MODULE 20-517A/518A
pickering SECTION 1 - TECHNICAL SPECIFICATION
Switching Matrix Module – 20-518A
pickeringtest.com
Ordering Information
© Copyright (2019) Pickering Interfaces. All Rights Reserved Pickering Interfaces maintains a commitment to continuous product development, consequently we reserve the right to vary from the description given in this data sheet.
Product Order Codes
20x4 Matrix, Ruthenium Reed, 1-Pole
20x4 Matrix, Ruthenium Reed, 2-Pole
20-518A-021
20-518A-022
Product Customization
Pickering System 20 modules are designed and manufactured
on our own exible manufacturing lines, giving complete product
control and enabling simple customization to meet very specic
requirements.
Customization can include:
• Alternative relay types
• Mixture of relay types
• Alternative number of relays
• Different performance specications
All customized products are given a unique part number, fully
documented and may be ordered at any time in the future. Please
contact your local sales ofce to discuss.
Limiting Resistors
Built in limiting resistors on each row and column may be tted,
useful in preventing high current inrushes which may damage the
reed switch, please specify option -R.
Mating Connectors & Cabling
96-Pin ZIF Connector
ZIF Connector Pins, 100 off
10-964A-001
10-964A-801

Page 1.4 SWITCHING MATRIX MODULE 20-517A/518A
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SECTION 1 - TECHNICAL SPECIFICATION
Voltage Supplies
Logic Supply 5Vdc ±5%
Relay Supply 12Vdc ±10%
To Self-Test
Circuit
Y 1 Y 2 Y 4
lanoitpO
seireS
srotsiseR
tseT- fleS oT
tiucriC
X 1
X 20
X 2
lanoitpO
seireS
srotsiseR
Self-Test Relays
Isolation Relays
Matrix Relays
Figure 1.1 - Schematic of a 20 x 4 Single Pole Matrix Module
Schematic:
Product Order Codes
10 x 8 Matrix, Ruthenium Reed, 1-Pole 20-517A-021
10 x 8 Matrix, Ruthenium Reed, 2-Pole 20-517A-022
Former Products
Please note that manufacture has now ceased for the related product versions listed below. Should you require
any additional information related to them not contained in this manual please contact the factory.

Page 2.1
SWITCHING MATRIX MODULE 20-517A/518A
pickering SECTION 2 - TECHNICAL DESCRIPTION
SECTION 2 - TECHNICAL DESCRIPTION
FUNCTIONAL DESCRIPTION
Figure 2.1 - Switching Matrix Module 20-518A
Functional Block Diagram
STATUS LEDs
RELAY BOARD
SYSTEM 20 DRIVER
PCB ASSY
FRONT PANEL CONNECTOR
RELAY
COILS
RELAY
CONTACTS
TO FRONT
PANEL
Y1-4
X1-20
CONNECTOR J1
DRIVER
ICs
A functional block diagram is provided in Figure 2.1. The module is powered via chassis connector J1 with +12V
relay and +5V logic supplies. The interface to the user test equipment is via the front panel mounted connector. The
module comprises a Driver PCB Assy and a Relay PCB Assy populated with electro-mechanical relays. Additional
driver ICs are tted on the Relay PCB.
The module is available as a 20 x 4 Matrix utilising SPST or DPST Normally Open relays. The drivers on the Relay
PCB are fed with serial data from the System 20 Driver PCB. General status LEDs are provided on the front panel.
Relay switching is determined by operator programming.

Page 2.2 SWITCHING MATRIX MODULE 20-517A/518A
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SECTION 2 - TECHNICAL DESCRIPTION
12 3 4 5 20
21 34
6 7
21 34
SUB EUGOLANA ELOP 42 LANRETNI
20 x 4 Matrix
stuptuO 4
stupnI 08
12 3 4 5 20
21 34
6 7
21 34
20 x 4 Matrix
12 3 4 5 20
21 34
6 7
21 34
20 x 4 Matrix
12 3 4 5 20
21 34
6 7
21 34
20 x 4 Matrix
Figure 2.2- Example: 80 x 4 Matrix Switch
4 Poles of the internal Screened Analogue Bus are used to interconnect the 4 matrix modules.
Additional matrix modules may be simply plugged in to give further expansion.

Page 3.1
SWITCHING MATRIX MODULE 20-517A/518A
pickering SECTION 3 - INSTALLATION
Page 3.1
GENERAL PURPOSE REED RELAY MODULE 20-110/115/120/125
pickering SECTION 3 - INSTALLATION
SECTION 3 - INSTALLATION
Power Supply
with
Interface Module
above
6U System 20 Modules
(Not position dependent)
3U System 10 Modules
(Not position dependent)
kg
PRE-OPERATION CHECKS (UNPACKING)
1. Check the module for transport damage and report any damage immediately to Pickering Interfaces.
Do not attempt to install the product if any damage is evident.
2. Position the chassis relative to any other equipment the module(s) will connect with. Ensure the chassis is not
connected to the electrical supply.
3. Ensure that the designated area for the chassis containing the module is of at and solid construction to
withstand and support the combined weight of the module(s) and chassis.
!
Refer to the Warnings and Cautions at the front of this manual
Modular products require installation in a suitable System 10/20 chassis.
The module is designed for indoor use only.
!
HARDWARE INSTALLATION
ELECTRICAL CONNECTION (CHASSIS)
1. The chassis must be electrically installed in accordance with local regional electrical codes by a qualied
engineer.
2. Ensure the power supply lead provides the necessary integrity of chassis ground.
Electrostatic discharge can damage the components on the module. To avoid such damage in handling the
board refer to page VII.
Ensure that there is adequate ventilation.
Figure 3.1 - System 10/20 Front Access Case Split 24/60 with Various Modules Fitted.

Page 3.2 SWITCHING MATRIX MODULE 20-517A/518A
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SECTION 3 - INSTALLATION
Page 3.2 GENERAL PURPOSE REED RELAY MODULE 20-110/115/120/125
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SECTION 3 - INSTALLATION
Figure 3.2 - Module Guide Rail Position
Figure 3.3 - A Partially Built System 20 Front Access Chassis
!
MODULE INSTALLATION
The module should be installed in accordance with the following procedure:
1. Ensure that the system is turned OFF but still connected to mains so that it remains grounded.
2. If the module has address switches ensure they are set to the appropriate position. (See Section 4).
Note individual modules are not sent out with a system drawing detailing their address.
3. Choose an appropriate slot in the rack and remove the blanking plate (if tted).
(See the Pickering 10-910M IEEE-488 GPIB System 10/20 Ancillaries manual for further details).
(When tted, additional modules will be automatically recognised by the interface card. See Figure 3.1).
4. If necessary t the module guide rails as supplied with the module to both the top and bottom of the chassis
in that slot position. One guide rail slot should be to the left of the connector as shown in Figure 3.2.
5. Align the module with the backplane and screw holes at the front of the chassis.
Hold the handle whilst slowly sliding the module into the card guides until the module seats rmly into the
backplane. See Figure 3.4. The front panel of the module should be ush with the front or rear panel of the
chassis.
6. Screw the front panel of the module to the chassis front panel mounting rails.
7. Ensure all necessary modules including the power supply are tted to the rack and other slots blanked off
before powering up.
To achieve the correct initialisation of the sytem, ensure any slave chassis are powered up before the master
chassis.

Page 3.3
SWITCHING MATRIX MODULE 20-517A/518A
pickering SECTION 3 - INSTALLATION
Page 3.3
GENERAL PURPOSE REED RELAY MODULE 20-110/115/120/125
pickering SECTION 3 - INSTALLATION
Figure 3.4 - Module Insertion in a Pickering 20-935A-001 Front Access Chassis
SOFTWARE INSTALLATION
Refer to the Pickering manual 10-921M.
For the latest version of the driver please refer to our web site pickeringtest.com where links to our Software
Download page will provide the driver software for the various programming environments encountered.

Page 3.4 SWITCHING MATRIX MODULE 20-517A/518A
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SECTION 3 - INSTALLATION
SELF-TEST FUNCTION
Self-Test is invoked at power on (taking up to 60 seconds) and may also be operated under software (*TST?) or via
a recessed push button. Self-Test pass is indicated on a front panel LED with a full pass/fail description available
using the DIAGNOSTIC? command.
Self-Test comprises 3 levels, see Figure 3.5:
1. Logic Test: Checks all logic including on-board microprocessor, relay drivers etc.
2. Relay Coil Test: All reed relay coils are checked for continuity.
3. Full Contact Test: Tests all the relay contacts in the matrix block
(i) On-state resistance failure test. Fails if switch has on-state > 2Ω.
(ii) Off-state resistance test. A switch fails if it’s isolation resistance is < 106Ω.
The threshold for contact resistance is preset to approximately 2Ω at the factory. However this threshold may set
to customers precise requirements (from 200mΩ to 10Ω). If a very low threshold is selected, the self test could be
used to detect switches which are not failing to operate but which have reached an end of life condition, where the
contact resistance is starting to rise, indicating that the relay is due for replacement.
NB. The contact self test will only check the relay contacts in the core matrix block, isolation switches and self test
switches are not tested, please refer below.
Note: Spare reed relays are mounted onto the relay circuit board for fast repair, additional reed relays are available
from Pickering Interfaces.
Self-Test Operation
Self Test is always run at power on, taking approximately 60 seconds.
If self test is run under software control it will rstly clear the whole matrix (Manual Test will only function when the
module is in a clear state). So it is very important to prepare your external instruments and U.U.T. for this! During
self-test all isolation switches are opened so your external circuitry will see only very high resistance inputs.
When the self-test has nished the matrix will be returned to an all clear state (i.e. the previous state will not be
remembered!).
Please note that because of the long self-test time that your computer may time out waiting for the test result (many
PC's have default timeouts set to low values).
Detailed Self Test Reporting using the DIAGNOSTIC? Query
The DIAGNOSTIC? query will give an ASCII string detailing any self test failures. These will include:-
Logic: Microprocessor, RAM, EPROM, Relay Drivers, Invalid Link Settings etc.
Relay Coils: Open Circuit Coil.
Switch Contacts: High On Resistance, Low Off Resistance.
This string is not intended to be processed by the user’s software, it is suitable for copying directly onto the screen
of your control computer. This information will then indicate maintenance required (please contact Pickering for
further help).
Self Test Limitations
Self Test covers all aspects of the Matrix Module which are liable to fail in normal use. The only exceptions to this
are the following:-
“Isolation Relays”: These switches are used to isolate the matrix from the users external circuitry, for this reason they
cannot be included in the contact self test routine. These relays always “cold switch” (i.e. they are always operated
without any load, as opposed to the matrix switches which always “hot switch”), therefore they should have an
expected life in excess of 108 operations. These switches will only fail if a very heavy current is passed through the
contacts (greater than around 3-4A for 10's of milliseconds), this may result in switch weld to either an isolation or
matrix switch. Please note that all relays including isolation and self test relays are included in the coil test, so an
open circuit coil or faulty driver IC will be picked up and reported.
“Self Test Relays”: There are self test relays on every x and y axis on the matrix board, if one of these contacts fails
(very unlikely) then all relays on that axis will appear to fail self test.

Page 3.5
SWITCHING MATRIX MODULE 20-517A/518A
pickering SECTION 3 - INSTALLATION
Figure 3.5 - Self-Test: Basic Flow Diagram
SELF TEST INITIATED BY:
.POWER ON
.*TST? INTERFACE COMMAND
.MANUAL BUTTON
CLEAR MATRIX
LOGIC TEST:
. MICROPROCESSOR BOARD
. RELAY BOARD
CONTACT TEST:
. SWITCH ON STATE
. RESISTANCE OF <2Ω
. SWITCH OFF STATE
RESISTANCE >1MΩ
LOGIC TEST
FAIL ?
CONTACT
TEST FAIL ?
RELAY COIL
TEST FAIL ?
RELAY COIL TEST
SELF TEST PASS
SELF TEST FAILURE:
ERROR LED ON
USE DIAGNOSTIC? COMMAND
TO GET ERROR MESSAGE
Yes
No
Yes
No
Yes
No

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SECTION 3 - INSTALLATION
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