Pickering 40-412-101 User manual

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Issue 2.2 January 2020
40-412-101 User Manual
PXI 32 Channel Digital I/O Module With Programmable
Threshold

Page (II) 32-CHANNEL DIGITAL I/0 MODULE 40-412-101
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Page (II) REED RELAY MODULE 40-110/115/120/125
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© COPYRIGHT (2020) 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)
32-CHANNEL DIGITAL I/0 MODULE 40-412-101
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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
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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) 32-CHANNEL DIGITAL I/0 MODULE 40-412-101
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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.

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32-CHANNEL DIGITAL I/0 MODULE 40-412-101
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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
Guidance on Using The 40-412 .........................................2.2
Section 3
Installation....................................................................................3.1
Pre Operation Checks........................................................3.1
Hardware Installation .........................................................3.2
Software Installation ..........................................................3.2
Testing Operation ...............................................................3.3
Section 4
Programming Guide....................................................................4.1
Programming Options for PXI Modules ...........................4.1
40-412 Digital Input-Output Sub-Units..............................4.2
Using The Direct Driver or VISA Driver ............................4.3
Input Threshold Voltage Bit Patterns ...............................4.5
Section 5
Connector Information................................................................5.1
Section 6
Troubleshooting ..........................................................................6.1
Section 7
Maintenance Information............................................................7.1
Verication Procedure .......................................................7.2
Verication Test Results ....................................................7.5
Input/Output Look-Up Tables ...........................................7.6
CONTENTS

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Page (VII)
32-CHANNEL DIGITAL I/0 MODULE 40-412-101
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Page (VII)
2 AMP 1-POLE UHD MATRIX MODULES 40-575 / 576 / 577 / 578 / 579
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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 host 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.
Not to be used in safety critical circuits, refer to the Pickering Interfaces’ terms & conditions of sale.
This module must not be used for the switching of Mains Circuits. For the switching of voltages up
to the module’s full specication, Secondary Circuit power supplies and the Device Under Test must
be fully isolated from the Mains Circuit and the safety earth.
The host chassis must be correctly installed and be connected to mains or factory safety ground,
please refer to your chassis installation manual.
Diagram Showing Separation Between The Mains Circuit and Secondary Circuit / DUT
For the purposes of this document, a Mains Circuit is an installation classied as Overvoltage
Category II up to 300V. Separation between the Secondary Circuit and Mains Circuit is achieved
by a transformer in which the primary windings are separated from the secondary windings by
reinforced insulation, double insulation, or a screen connected to the protective conductor terminal.
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.
PXI Switching
Module
Device
Under Test
Power
Supply
Power
Supply
Host Chassis
Secondary Circuit
Mains
Circuit
Mains
Circuit
Mains/Factory
Safety Ground

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Page (VIII) 2 AMP 1-POLE UHD MATRIX MODULES 40-575 / 576 / 577 / 578 / 579
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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.
• For suitably equipped products in the event of an emergency press the red “emergency stop” button situated on
the front of the unit.

Page 1.1
32-CHANNEL DIGITAL I/0 MODULE 40-412-101
pickering SECTION 1 - TECHNICAL SPECIFICATION
SECTION 1 - TECHNICAL SPECIFICATION
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PXI 32 Channel I/O - Programmable Threshold 40-412-101
ISSUE 2.0 APR 2018
• 32-Channel Input
• Dual Programmable Voltage Threshold, 0.3 to 50V
• Parallel Acquisition
• High Input Voltage Tolerance
• 32-Channel Output
• High Side or Low Side Driving
• 0.5A Low Side Sink Capability
• 0.4A High Side Source Capability
• Fully Protected Outputs
• High Side External Voltage Input
• VISA, IVI & Kernel Drivers Supplied for Windows
• Supported by PXI or LXI Chassis
• 3 Year Warranty
Functional Diagram 40-412-101 32-Channel Digital
I/O Module With Parallel Input Acquisition
PCI
INTERFACE
PXI
BUS
Vext
1
2
32
1
2
32
Digital Outputs
Digital Inputs
High Side
Driver
Low Side
Driver
Vext
GND
En
En
Output 1
Output 2
Output 32
32-Channel
Attenuator
32-Channel
Dual
Threshold
Detector
Ref1
Ref2
The 40-412-101 is a 32-channel Digital I/O module with high output
voltage and current capability and a dual variable threshold input.
The 32 outputs can be used for high or low drive and each channel
is capable of sourcing 0.4A from the high side or 0.5A sink on the
low side. Accidental operation of both high and low side driver on
the same channel is prevented by the supplied driver. Outputs
are fully protected against over-voltage, over-current and thermal
overload, ensuring robust and reliable operation in the toughest
test environments. For high side driving, the voltage source is
supplied externally, allowing the module to drive high capacity
loads separate from the PXI chassis power supply. For low side
driving, the external source is not used and the module’s output
operates an open collector or open drain driver.
The built in protection systems include an over-voltage clamp so
the module can drive relay coils without the use of y back diodes.
The states of the 32 input channels are read via the PXI interface
by comparing the input level to two threshold voltages. These can
be set between 0.3V and 50V and have a resolution of 12.5mV.
This allows the input to be tested against system limits that dene a
logic low or logic high.
The 40-412-101 uses 32 sets of comparators to synchronously
capture all 32 input states and then reads the status in a single
operation.
Each input can withstand the accidental application of voltage
greater than 100V. The inputs can be user connected to the
outputs without risk of damage, allowing the module to operate as
32 channels of independent input and output or as 32 channels of
congurable I/O.
Connection to the module’s input and outputs is via an easy to
use 78-pin D-type connector which is fully supported by a range of
connector accessories.

Page 1.2 32-CHANNEL DIGITAL I/0 MODULE 40-412-101
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SECTION 1 - TECHNICAL SPECIFICATION
32 Channel Digital I/O – 40-412-101
pickeringtest.com
Specifications
Output Specification
No. of Output Channels: 32
Output States: Driven high, driven low or off.
Low Side Driver Output
Resistance: 0.6Ωat 0.5A
High Side Driver Output
Voltage: Vext less 1.5V at 0.4A
Maximum Current: 0.5A for Low Side drivers,
0.4A for High Side drivers,
8A module total.
Maximum Voltage: +50V*
Output Protection: Current limited, overvoltage
limited, thermal protection.
Overvoltage limit can be used
to limit back emf generated from
inductive loads such as relay
coils.
Vext: User supplied +5V to +50V*,
applied to multiple pins of user
connector, relative to front panel
ground.
* For full voltage rating, signal sources must be fully isolated from
mains supply and safety earth.
Power Requirements
+3.3V +5V +12V -12V
0 0.1A 0.05A 0.05A
Operating/Storage Conditions
Operating Conditions
Operating Temperature:
Humidity:
Altitude:
0°C to +55°C
Up to 90% non-condensing
5000m
Storage and Transport Conditions
Storage Temperature:
Humidity:
Altitude:
-20°C to +75°C
Up to 90% non-condensing
15000m
PXI & CompactPCI Compliance
The module is compliant with the PXI Specication 2.2. Local Bus,
Trigger Bus and Star Trigger are not implemented.
Uses a 33MHz 32-bit backplane interface.
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.
Mechanical Characteristics
Single slot 3U PXI (CompactPCI card).
Module weight: 180g.
3D models for all versions in a variety of popular le formats are
available on request.
Connectors
PXI bus via 32-bit P1/J1 backplane connector.
Signals via front panel 78-pin male D-Type connector, for pin outs
please refer to the operating manual.
Input Specification
No. of Input Channels: 32
Logic Threshold: Compares selected input
voltage against two reference
voltages, each of which can be
set from 0.3 to 50V with 12.5mV
setting resolution.
40-412-101 uses faster parallel
acquisition from a common pair
of threshold voltages.
Settling Time: 5μs following a state change.
Read back time for all 32 states
50μs typical.
Channel Selection: Single channel selection or
automated sequential access to
all 32 channels.
Maximum Input Voltage: 100V*
Input Impedance: 1MΩ
* For full voltage rating, signal sources must be fully isolated from
mains supply and safety earth.

Page 1.3
32-CHANNEL DIGITAL I/0 MODULE 40-412-101
pickering SECTION 1 - TECHNICAL SPECIFICATION
32 Channel Digital I/O – 40-412-101
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Ordering Information
Mating Connectors & Cabling
For connection accessories for the 40-412-101 please refer to the
90-006D 78-pin D-Type Connector Accessories data sheet where
a complete list and documentation can be found for accessories,
or refer to the Connection Solutions catalog.
Product Order Codes
32-Channel Digital I/O Module - Parallel
Input Acquisition, Programmable Threshold
40-412-101
Product Customization
Pickering PXI 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.
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.

Page 1.4 32-CHANNEL DIGITAL I/0 MODULE 40-412-101
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SECTION 1 - TECHNICAL SPECIFICATION
32 Channel Digital I/O – 40-412-101
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Supporting Products & Software
We also offer customized cabling and have a free online Cable Design Tool that can be
used to create custom cable solutions for many applications.
Visit: pickeringtest.com/cdt to start your design.
Mass Interconnect
We recommend the use of a mass interconnect solution when an Interchangeable Test
Adapter (ITA) is required for a PXI or LXI based test system. Our modules are fully
supported by both Virginia Panel and MacPanel.
Pickering Reed Relays
We are the only switch provider with in-house reed relay manufacturing capability via
our sister company, Pickering Electronics. These instrument grade reed relays feature
SoftCenter® technology, ensuring long service life and repeatable contact performance.
To learn more, please go to: pickeringrelay.com
Chassis Compatibility
This PXI module must be used in a suitable chassis. It is compatible with the following chassis types:
• All chassis conforming to the 3U PXI and 3U Compact PCI (cPCI) specication
• Legacy and Hybrid Peripheral slots in a 3U PXI Express (PXIe) chassis
• Pickering Interfaces LXI or LXI/USB Modular Chassis
Chassis Selection Guide
Standard PXI or hybrid PXIe Chassis from any Vendor:
• Mix our 1000+ PXI switching & simulation modules with any
vendor’s PXI instrumentation
• Embedded or remote Windows PC control
• Real-time Operating System Support
• High data bandwidths, especially with PXI Express
• Integrated module timing and synchronization
Pickering LXI or LXI/USB Modular Chassis—only accept
our 1000+ PXI Switching & Simulation Modules:
• Ethernet or USB control enables remote operation
• Low-cost control from practically any controller
• LXI provides manual control via Web browsers
• Driverless software support
• Power sequencing immunity
• Ethernet provides chassis/controller voltage isolation
• Independence from Windows operating system
Connectivity Solutions
We provide a full range of supporting cable and connector solutions for all our switching products—20 connector families with 1200+
products. We offer everything from simple mating connectors to complex cables assemblies and terminal blocks. All assemblies are
manufactured by Pickering and are guaranteed to mechanically and electrically mate to our modules.
Connectors & Backshells Multiway Cable Assemblies RF Cable Assemblies Connector Blocks

Page 1.5
32-CHANNEL DIGITAL I/0 MODULE 40-412-101
pickering SECTION 1 - TECHNICAL SPECIFICATION
32 Channel Digital I/O – 40-412-101
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Supporting Products & Software
© Copyright (2020) 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.
Programming
Pickering provide kernel, IVI and VISA (NI & Keysight) drivers which are compatible with all Microsoft supported versions of Windows and
popular older versions. For a list of all supporting operating systems, please see: pickeringtest.com/os
The VISA driver is also compatible with Real-Time Operating Systems such as LabVIEW RT. For other RTOS support contact Pickering.
These drivers may be used with a variety of programming environments and applications including:
• Pickering Interfaces Switch Path Manager
• National Instruments products (LabVIEW, LabWindows/CVI, Switch Executive, MAX, TestStand, VeriStand, etc.)
• Microsoft Visual Studio products (Visual Basic, Visual C+)
• Keysight VEE and OpenTAP
• Mathworks Matlab
• Marvin ATEasy
• MTQ Testsolutions Tecap Test & Measurement Suite
Drivers for popular Linux distributions are available, other environments are also supported, please contact Pickering with specic enquiries.
We provide Soft Front Panels (SFPs) for our products for familiarity and manual control, as well as comprehensive documentation and
example programs to help you develop test routines with ease.
To learn more about software drivers and development environments, please go to:
pickeringtest.com/software
Signal Routing Software
Our signal routing software, Switch Path Manager, automatically selects and energizes switch
paths through Pickering switching systems. Signal routing is performed by simply dening test
system endpoints to be connected together, greatly accelerating Test System software
development. To learn more, please go to: pickeringtest.com/spm
Diagnostic Relay Test Tools
eBIRST Switching System Test Tools are designed specically for our PXI, PCI or LXI
products, these tools simplify switching system fault-nding by quickly testing the system
and graphically identifying the faulty relay.
To learn more, please go to: pickeringtest.com/ebirst
Three Year Warranty & Guaranteed Long-Term Support
All standard products manufactured by Pickering Interfaces are warranted against defective materials and workmanship for a period of three
years from the date of delivery to the original purchaser. Extended warranty and service agreements are available for all our modules and
systems with various levels to suit your requirements. Although we offer a 3-year warranty as standard, we also include guaranteed long-
term support—with a history of supporting our products for typically 15-20 years. To learn more, please go to: pickeringtest.com/support
Available Product Resources
We have a large library of product resources including success stories, product and support videos, articles, as well as complete product
catalogs and product reference maps to assist when looking for the switching, simulation and cable and connector solutions you need.
We have also published handy reference books on Switching Technology and for the PXI and LXI standards.
To view, download or request any of our product resources, please visit: pickeringtest.com/resources

Page 1.6 32-CHANNEL DIGITAL I/0 MODULE 40-412-101
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SECTION 1 - TECHNICAL SPECIFICATION
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Page 2.1
32-CHANNEL DIGITAL I/0 MODULE 40-412-101
pickering SECTION 2 - TECHNICAL DESCRIPTION
SECTION 2 - TECHNICAL DESCRIPTION
FUNCTIONAL DESCRIPTION
A functional block diagram is provided in Figure 2.1. The Module is powered by the +5V, +12V and -12V supplies
from the PXI backplane via Compact PCI connector J1. The interface to the user’s equipment is via the front panel
mounted 78-pin D-type connector, J2.
The module’s 32 channel output section comprises High Side and Low Side drivers U26 to U89 and Shift Registers
U18 to U25. The shift registers control the output drivers and are supplied with serial data from the PCI Bridge, U1,
via the control logic. Each output can be switched to either sink current to the GND terminal via a Low Side driver
device, or source current from the Vext terminal via a High Side driver device.
The 40-412-101 has parallel input acquisition with the input circuitry tted to a daughter board which is mounted on
top of the mother board. The module’s 32 input channels are rst fed through an attenuator circuit, then comparator
devices U17 to U32 determine whether each input signal is greater than the two thresholds programmed by the user.
The resultant 64 data bits are latched by U33 to U40 and read by the PCI Bridge.
The PCI Bridge is congured by EEPROM U2, the module conguration is stored in EEPROM U11.
78-PIN D-TYPE
CONNECTOR
J2
MODULE
CONFIGURATION
U11
PCI
BRIDGE
FPGA
U1
PCI BRIDGE
CONFIGURATION
U2
TERMINATING
RESISTORS
R1 TO R12
COMPACT PCI
BUS
CONNECTOR
J1
+5V
0V
HIGH SIDE &
LOW SIDE
DRIVERS
U26 to U89
SHIFT
REGISTERS
U18 to U25
CONTROL
LOGIC
U2 to U10
+12V
-12V
VOLTAGE
REGULATOR
U17
+2.5V
Vext
GND
INPUT
ATTENUATOR
R50 to R145
COMPARATORS
U17 & U32
DATA
LATCHES
U33 & U40
40-412-101 PARALLEL INPUT ACQUISITION - DAUGHTER BOARD
Figure 2.1 - Digital I/O Module 40-412-101: Functional Block Diagram

Page 2.2 32-CHANNEL DIGITAL I/0 MODULE 40-412-101
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SECTION 2 - TECHNICAL DESCRIPTION
GUIDANCE ON USING THE 40-412
Output Drivers
The 40-412 provides two output driver types on each of the 32 channels:
•High Side Driver. The high side driver allows the user to set the output voltage actively high to an externally
supplied voltage source. The external voltage source can be between +5V and +50V relative to ground.
•Low side driver. The low side driver actively connects the output to ground.
The software driver inhibits both the high and low side drivers being turned on at the same time.
Each driver output is fully protected from thermal, voltage or current overloads. However, continuous operation at
voltages beyond the stated ratings may cause damage.
Each driver contains overvoltage protection that can be used to protect the driver from inductive back EMF spikes
generated when turning coil currents off. Using this protection to manage the back EMF will not cause damage to
the driver, however the sudden current change can generate EMC events. Pickering Interfaces recommends that
where possible the user should provision local measures (such as a ywheel diode) to limit the back EMF current
ow through the cables.
The user can select both drivers to be inactive to provide a tri-state (open) output voltage.
The external voltage source needs to be applied only if the high side driver is required to be used, it can grounded
or left unconnected if the high side driver is not required to be used.
Driving Inductive Loads
Users can use the high/low side drivers to drive highly inductive loads such as the coils of relays or solenoids, the
protection circuits in the 40-412 will ensure the drivers are not easily damaged. However, it is recommended that
precautions are taken to manage the resulting EMC issues that might arise.
High Side
Driver
Vext
FP_GND
En
40-412
GND
D1
D3
D2
Output
External Voltage
Figure 2.2 - Using the 40-412: Driving an inductive load with a High Side Driver
When using the high side driver, on driver closure, current will build in the coil until it reaches a steady state. When
the driver is opened, the energy in the inductor will need to be discharged. This discharge can be through the diode
inside the 40-412 (D1, Figure 2.2) - this will not damage the 40-412. However, the discharge may cause a ground
spike that may result in EMC emission. We recommend that where possible a local diode is tted (D2, Figure 2.2)
which will reduce the ground current owing and reduce the EMC emissions.

Page 2.3
32-CHANNEL DIGITAL I/0 MODULE 40-412-101
pickering SECTION 2 - TECHNICAL DESCRIPTION
When using the low side driver a similar effect occurs when the driver is opened. The inductive energy stored is
discharged by the voltage on the 40-412 output becoming positive and a clamp diode (D1, Figure 2.3) acting to
protect the driver. It is recommended that the user ts a ywheel diode (D2, Figure 2.3) to discharge the inductive
energy. If a ywheel diode is not tted, the 40-412 will clamp the output at a voltage between 60V and 80V relative
to the front panel ground, the voltage being dependent upon the breakdown voltage of D1, Figure 2.3.
Driving Capacitive Loads
The 40-412 can be used to drive capacitive loads. When the driver is closed, the current limit protection circuit will
limit the current owing into the capacitive load. Continuous rapid connection and disconnection to a capacitive load
may result in the thermal protection circuits preventing further operation. If this occurs, simply allow the 40-412 to
cool down, after which normal operation will resume.
Vext Connection
When using the high side drivers, Vext is required to provide the current to the 40-412 output circuits. The Vext
connection is made using multiple pins on the D-type connector. It is strongly recommended that if high load
currents are expected, then all the available pins are used to spread the current load in order to avoid damaging the
connector. The connections to Vext are internally linked together in the 40-412, so specic pins are not required to
be used for a particular bank of drivers. To maximize connector life we suggest using 5 Amps per pin or less. Users
should not apply negative voltages (relative to ground) to Vext or apply voltages greater than +50V.
FP_GND Connection
When using the low side drivers, FP_GND is required to sink the current from the 40-412 output circuits. The FP_
GND connection is made using multiple pins on the D-type connector. It is strongly recommended that if high load
currents are expected, then all the available pins are used to spread the current load in order to avoid damaging
the connector. The connections to FP_GND are internally linked together in the 40-412, so specic pins are not
required to be used for a particular bank of drivers. To maximize connector life we suggest using 5 Amps per pin
or less. Spare FP_GND Connections can be used for the purpose of screening or shielding in cable assemblies or
connector blocks
Using High and Low Side Drivers
The user can select on an individual channel basis whether a high side or low side driver is used. In Figure 2.2, D3
prevents the discharge of energy into Vext when the low side driver is operated.
Low Side
Driver
Vext
FP_GND
En
40-412
GND
D1
D2
Output
C
Figure 2.3 - Using the 40-412: Driving an inductive load with a Low Side Driver

Page 2.4 32-CHANNEL DIGITAL I/0 MODULE 40-412-101
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SECTION 2 - TECHNICAL DESCRIPTION
INPUT CONNECTION
Each of the 32 channels can be compared to two voltage references levels. The reference level is set by a 12 bit
digital word with full scale corresponding to 50V and zero to 0V. The use of two threshold levels makes it easier for a
user to determine the status of the input. For example, a typical application might be in a system operating from 28V
supplies where the state needs to be established using a criteria equivalent to 20% of the supply:
• First threshold is set to 5.6V (20% of 28V), a low condition will indicate the state is low.
• Second threshold is set to 22.4V (80% of 28V) to conrm a high state.
• Intermediate conditions can be detected since the input is above the rst threshold but below the second
threshold.
Since the state is read at the same instant against each threshold, measurements are not confused by dynamically
changing voltages.
As the 40-412-101 has parallel input sampling, all inputs are compared to the programmable voltage reference
levels at the same time.
Vext and GND Break Detection
Some applications require a test to ensure that an input connection is not broken. For a connection that is set be at
Vext the 1MΩ input impedance to the input will drag the voltage down to ground in the event of a break. To detect a
break to a signal that is supposed to be at ground potential this will not give a good indication. However, if the input
is connected by an external 1MΩ resistor to Vext then in the event that there is a break the signal will go to 0.5 of
Vext and the dual detection thresholds can be set to detect this.
Example:
Vext is 28V, the thresholds are set at 4V and 24V. The input will appear to be in the mid voltage state of 14V,
greater than 4V but less than 24V and the signal break can be detected.
Settling Time
The 40-412-101 uses a synchronous acquisition process that samples all the 32 states at the same time, eliminating
the settling time constants associated with the switching system. The 40-412-101 is suited to applications where
states may be changing and users wish the states to be sampled at the same instant in time. The input states are
captured and then read back to the PXI control system through a serial process. The read back speed is dependent
on the speed of the controller, modern controllers will read back the 32 states in between about 10µs and 30µs.
CONNECTING INPUT AND OUTPUT
It is permitted for a user to connect an input and output channel together using external wiring (for example in a
connector block). In this way the input can be used to check that the output connection is being correctly driven.
It should be noted that if the output is set tri-state (both drivers off) the input impedance to the input channel will drag
the output voltage to a low state in the absence of any external source of voltage or current.
Note that when the inputs and outputs are wired together by the user and both the high side and low side drivers are
off, the input/output state will be asserted low. This is due to the impedance of the input connection.

Page 3.1
32-CHANNEL DIGITAL I/0 MODULE 40-412-101
pickering SECTION 3 - INSTALLATION
Page 3.1
REED RELAY MODULE 40-110/115/120/125
pickering SECTION 3 - INSTALLATION
kg
PREOPERATION 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.
SECTION 3 - INSTALLATION
!
Refer to the Warnings and Cautions at the front of this manual
Modular products require installation in a suitable PXI/LXI chassis. The module is designed for indoor use only.
Figure 3.1 - Installing the Module into a PXI/cPCI/LXI Chassis
PXI / LXI Chassis

Page 3.2 32-CHANNEL DIGITAL I/0 MODULE 40-412-101
pickering
SECTION 3 - INSTALLATION
Page 3.2 REED RELAY MODULE 40-110/115/120/125
pickering
SECTION 3 - INSTALLATION
SOFTWARE INSTALLATION
First install the appropriate Pickering PXI switch card drivers by running the installer program Setup.exe (provided
in a compressed zip le), either from the CD-ROM supplied, or by downloading the latest version from our website
pickeringtest.com - the recommended method. Setup is accompanied by a ReadMe le containing
additional installation information. A single installation covers all cards in the System 40, System 45 and System
50 ranges.
When installation completes, the installed drivers’ ReadMe le is offered for display. It can also be displayed
later using a shortcut on the Programs>>Pickering menu.
If you are not a LabVIEW user you should choose the “full” version, and once that has been installed run
the LabVIEW Runtime Engine installer via the shortcut on the Programs>>Pickering menu. In the absence of
LabVIEW the Runtime Engine is required to support the Pickering Test Panels application.
!
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. The chassis must be grounded.
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.
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. Choose an appropriate slot in the rack.
3. Remove the blanking plate for the chosen slot.
4. Ensure that the injector/ejector handle is in its downward position. Align the module with the card guides on
the top and bottom of the slot.
Do not raise the injector/ejector handle whilst inserting the module as the module will not insert properly.
5. Hold the handle whilst slowly sliding the module into the card guides until the handle catches on the injector/
ejector rail (refer to Figure 3.1).
6. Raise the injector/ejector handle until the module rmly seats into the backplane. The front panel of the
module should be ush with the front panel of the chassis.
7. Secure the front panel of the module using both screws to the chassis front panel mounting rails.
8. In a system employing a remote control interface to connect an external controller to a PXI chassis or to link
multiple chassis, power-up the system as follows:
a. For a system comprising an external controller and one chassis, power up the chassis before powering up
the external controller.
b. For a system comprising more than one chassis, turn ON the last chassis in the system followed by the
penultimate, etc, and nally turn ON the external controller or chassis containing the system controller.
9. For Pickering Interfaces modular LXI installation there is no requirement to use any particular power up
sequence.