ADLINK PXI-7901 User Manual

16-CH, General-Purpose SPDT Relay

PXI-7901

Module

User’s Manual

Recycled Paper

© Copyright 2004 ADLINK Technology Inc.

All Rights Reserved.

Manual Rev. 1.00: June 28, 2004

Part Number: 50-17010-100

The information in this document is subject to change without prior notice in
order to improve reliability, design, and function and does not represent a
commitment on the part of the manufacturer.

In no event will the manufacturer be liable for direct, indirect, special,
incidental, or consequential damages arising out of the use or inability to use
the product or documentation, even if advised of the possibility of such
damages.

This document contains proprietary information protected by copyright. All
rights are reserved. No part of this manual may be reproduced by any
mechanical, electronic, or other means in any form without prior written
permission of the manufacturer.

Trademarks

NuDAQ

®

, NuIPC®, NuDAM®, NuPRO® are registered trademarks of ADLINK
Technology Inc. Other product names mentioned herein are used for
identification purposes only and may be trademarks and/or registered
trademarks of their respective companies.

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Table of Contents

How to Use This Manual.............................................................. ii

Chapter 1 Introduction ..............................................................1

1.1 Features............................................................................. 1

1.2 Applications........................................................................ 2

1.3 Specifications..................................................................... 2

1.4 Software Support ............................................................... 3

Chapter 2 Installation ................................................................5

2.1 Contents.............................................................................5

2.2 Unpacking.......................................................................... 5

2.3 Mechanical Drawing...........................................................6

2.4 Installing the switch module into a PXI Platform................ 6

Chapter 3 Signal Connection.................................................... 9

3.1 PXI-7901 Topology.............................................................9

3.2 PXI-7901 Pin assignment & Description ............................ 9

3.3 TB-6201 Terminal Board .................................................. 10

Chapter 4 Operation Theorem ................................................ 11

4.1 Hardware Block Diagram................................................. 11

4.2 Operation Mode ............................................................... 12

4.3 Handshaking.................................................................... 12

4.4 Trigger Bus.......................................................................16

4.5 Star Trigger ......................................................................17

4.6 Auxiliary Digital I/O ...........................................................18

4.7 Hot-Swap ......................................................................... 19

4.8 Emergency Shutdown......................................................19

4.9 Watchdog Timer ...............................................................20

Warranty Policy........................................................................23

Table of Contents • i

How to Use This Manual

This User Manual is designed to assist users in the installation of the ADLINK
PXI-7901, 16-CH General Purpose SPDT Relay PXI Switch module.

Chapter 1 Introduction

Gives an outline and overview of ADLINK switch modules’
features, specifications, and applications.

Chapter 2 Installation

Describes how to install a switch module into a PXI chassis. For
software library and utilities installation, please refer to the
Software Users’ Guide.

Chapter 3 Signal Connection

Shows the pin assignments and terminal board connection of the
switch module.

Chapter 4 Operation Theorem

Describes function blocks on ADLINK switch modules and
operation instructions.

ii • How to use this Manual

1

Introduction

ADLINK PXI-7901 is a general-purpose (GP) switch module implementing 16­CH independent single-pole double-throw (SPDT) relays (1 Form C). PXI-7901
can connect one input to one output, and be used as signal switching or routing
for measurement systems as well as ATE.

Relays of PXI-7901 can be updated by either direct-update mode or auto-scan
mode. The latter mode supports scanlist of 1k-sample for deterministic
scanning.

PXI trigger functions are fully supported and software programmable. The
multiple switch modules can be synchronized and triggered without additional
field wiring.

For safety critical applications, PXI-7901 module can switch to the preset state
by either asserting emergency shutdown manually, or watchdog timer overflow
event.

1.1 Features

• PXI specifications Rev. 2.0 compliant

• 3U Eurocard form factor, CompactPCI compliant (PICMG 2.0 R3.0)

• PICMG 2.1 R2.0 CompactPCI Hot-Swap

• 16-CH SPDT (1 Form C) non-latching relays

• Contact rating

• 3A switching, 3A carrying

• 220V

• 125 operations per second

• 1k-sample scanlist for deterministic scanning

• Provides handshaking signals to trigger external instruments

• Programmable emergency shutdown function and Watchdog timer for

safety critical applications

• Eight auxiliary 3.3 V/TTL digital inputs/outputs with 5V tolerance

• Supports PXI backplane triggers to synchronize multiple modules

• Fully software programmable

, 250VAC

DC

specifications compliant

Introduction • 1

1.2 Applications

• Industrial ON/OFF control

• External high power relay driving and signal switching

• Laboratory automation

• Industrial automation

• Switch contact status sensing

• Limit switch monitoring

• Cooperating with other modules such as A/D and D/A peripherals to

implement a data acquisition and control system

1.3 Specifications

Relay Output

• Number of channels: 16

• Relay type: SPDT (1 Form C), non-latching

• Switching capacity:

• Max. switching current: 3A

• Max. switching voltage: 220V

• Max. switching power: 50VA, 60W
♦ Max. carrying current: 3A

• Failure rate: 10µA

• Contact resistance: 150mΩ max.

• Relay set/reset time

• Operate time: 5ms max.

• Release time: 5ms max.

• Bounce time: 3ms max.

• Expected life:

• Mechanical life: 10

• Electrical life: 10

• Data transfer: Programmed I/O

8

operations min.

6

operations min. (0.4A @ 12VAC, resistive load)

, 250VAC

DC

Auxiliary Digital I/O

• Numbers of channel: 8 inputs/outputs

• Compatibility: 3.3 V/TTL (5V tolerant)

• Data transfers: programmed I/O

Handshaking Signals

• Programmable polarity

• Logic level: 3.3 V/TTL (5V tolerant)

• Trigger In source: AUX1, PXI trigger bus, PXI star trigger in

• Scanner Advanced destination: AUX0, PXI trigger bus, PXI star trigger

out

2 • Introduction

Safety functions

• Emergency shutdown

• Logic level: 3.3 V/TTL (5V tolerant)

• Active with logic low (for AUX2/SHDNn pin)

• Emergency shutdown sources: AUX2/SHDNn, PXI star trigger

input, PXI trigger bus

• Watchdog timer

• Base clock available: 10MHz, fixed

• Counter width: 32-bit

• Watchdog Timer Overflow sources: Onboard 32-bit watchdog

timer, PXI star trigger input, PXI trigger bus

General Specifications

• I/O Connector: 62-pin D-sub male

• Operating temperature: 0 to 55°C

• Storage temperature: -20 to 70°C

• Humidity: 5 to 95% non-condensing

• Power requirements (when all relays are activated simultaneously)

+5V +3.3V

700mA 400mA

• Dimensions (not including connectors)

• 160 mm x 100 mm

1.4 Software Support

ADLINK's ADL-SWITCH driver package is for Microsoft Windows operating
systems, including Windows 98/ME/NT/2000/XP.

The driver package also provides utilities to test your switch module, as well as
programming samples and source codes in Microsoft Visual Basic and Visual
C/C++.

For other operating systems, please contact ADLINK for more information.

Introduction • 3

2

Installation

This chapter describes the installation process for the ADLINK switch module.
Please read the contents of the package and the disassembling information
carefully as they are important in the implementation of the ADLINK switch
module.

2.1 Contents

The package consists of the following items in addition to the User Manual:

• PXI-7901, 16-CH General Purpose SPDT Relay module

• This User’s Guide

• ADLINK Software CD

• ADL-Switch User’s Guide

If any of these items are missing or broken, please do not hesitate to contact
ADLINK or the dealer from whom the product was purchased. Keep the
shipping materials and carton for future storage or shipping.

2.2 Unpacking

ADLINK switch module contains sensitive electronic components that can be
easily damaged by static electricity. The switch module should be operated on a
grounded anti-static mat. It is strongly recommended that the operator wears an
anti-static wristband, grounded at the same point as the anti-static mat.

Inspect the box for any obvious damage. Check the unit to ensure there are no
shipping and handling damages that may have occurred before proceeding.

After opening, remove the system module and place it only on a grounded anti­static surface component side up.

Again, inspect the module for any damage. Press down on all the socketed IC’s
to make sure they are all properly seated. Please do this only on a firm and flat
surface.

Installation • 5

Note: DO NOT APPLY POWER TO THE MODULE IF IT HAS BEEN
DAMAGED.

You are now ready to install the PXI-7901.

2.3 Mechanical Drawing

Figure 1: ADLINK Switch Module

ADLINK switch module is packaged in a Eurocard form factor compliant with
PXI Specifications measuring 160 mm in length and 100 mm in height (not
including connectors). A 62-pin connector is located at the front panel for wiring
purposes and the J1/J2 IEC connectors in the rear are used to link the chassis
backplane. With its modular, rugged, and high shock resistant mechanical
features, the switch module functions exceptionally well in any harsh
environment application.

2.4 Installing the switch module into a PXI Platform

To insert the ADLINK PXI switch module, align the module’s edge with the card
guide in the PXI chassis. Slide the switch module into the chassis, until
resistance is felt from the PXI connector. Push the ejector upwards and fully
insert the switch module into the chassis. Once inserted, a “click” can be heard
from the ejector latch. Tighten the screws on the front panel.

6 • Installation

Figure 2: Installing the switch module into a PXI platform

Installation • 7

3

Signal Connection

3.1 PXI-7901 Topology

The PXI-7901 has 16 independent SPDT Relays onboard. Each relay has three
terminals, NC (normally closed), NO (normally opened), and COM (common).
When a relay is in its reset (de-energized) state, the NC connects to COM;
while in set (energized) state, the NO connects to COM. Thus all signal paths
on PXI-7901 are inherently break-before-make.

After power-up, all relays are in their reset (de-energized) state; i.e. NC
connects to COM.

3.2 PXI-7901 Pin assignment & Description

22. COM0

43. NO0 23. COM1 1. NC0

44. NO1 24. COM2 2. NC1

45. NO2 25. COM3 3. NC2

46. NO3 26. COM4 4. NC3

47. NO4 27. COM5 5. NC4

48. NO5 28. COM6 6. NC5

49. NO6 29. COM7 7. NC6

50. NO7 30. COM8 8. NC7

51. NO8 31. COM9 9. NC8

52. NO9 32. COM10 10. NC9

53. NO10 33. COM11 11. NC10

54. NO11 34. COM12 12. NC11

55. NO12 35. COM13 13. NC12

56. NO13 36. COM14 14. NC13

57. NO14 37. COM15 15. NC14

58. NO15 38. NC 16. NC15

59. NC 39. NC 17. NC

60. AUX3 40. AUX4 18. AUX2/SHDNn

61. AUX6 41. +5V out 19. AUX5

62. AUX7 42. AUX1/TRG_IN 20. GND

21. AUX0/S_ADV

Table 1: Pin Assignment

Signal Connection • 9

Signal Name Type Description

NO[15..0] Input/Output Normally opened terminal of relays
NC[15..0] Input/Output Normally closed terminal of relays
COM[15..0] Input/Output Common terminal of relays

Programmable Digital I/O with tri-state

AUX[7..0] Input/Output

TRG_IN Input Trigger input for handshaking operation

S_ADV Output

SHDNn Input Active-low Emergency Shutdown trigger

+5V out Output

GND Output Ground
NC Not Connected Unused pin

control.
AUX[2..0] are dual function pins used for
triggering, refer to chapter 4 for details.

Scanner Advanced trigger output for
handshaking operation

Unregulated +5V DC Source, maximum
100mA current loading

Table 2: Pin Description

3.3 TB-6201 Terminal Board

The TB-6201 is a screw terminal board with D-sub 62-pin female connector.
The terminal board can attach to PXI-7901 directly, or through ADLINK custom­made high-capacity 62-pin D-sub cable.
The pin description is described in Table 2.

10 • Signal Connection

4

Operation Theorem

4.1 Hardware Block Diagram

The ADLINK PXI Switch Module features an onboard FPGA for relay switching
control, trigger control, scanlist storage and sequencing. The PXI triggering and
synchronization functions, such as Star Trigger and Trigger Bus are also
supported. In addition to the Trigger In and Scanner Advanced signals for
external instruments handshaking, the switch module provides eight channels
of programmable digital I/O interface to facilitate general purpose control
applications.

To make full use of the flexible trigger and signaling system on the PXI platform,
the switch module has a built-in signal routing matrix that can exchange signals
between front panel digital I/O, Star Trigger, and Trigger Bus.

Scan Memory

Relay

DIO

Front Connector

Scan-

Trigger-in

Figure 3: Hardware Block Diagram

Relay

Control

Timing

Control

Signal

Routing

Matrix

Trigger
Control

PXI

Interface

Star Trigger In

Star Trigger Out

PXI Trigger Bus

Operation Theorem • 11

PXI Connector

4.2 Operation Mode

The ADLINK PXI Switch Module provides two relay operation modes to
accommodate different application requirements.

Direct-update

The Switch Module updates the relay pattern immediately upon receiving a
software command. This mode provides a straightforward control over switch
module with minimal hardware intervention. If relay contact bouncing is of a
concern, users would need to insert software delay.

ADLINK recommends the debounce time to be at least 8ms on PXI-7901.

Auto-scan

The ADLINK PXI switch module features onboard memory to store user
specified scanlist of up to 1024-entry. In each scanlist entry, users can specify
relay pattern, pattern advancing delay time and criterion.

The switch module can set status bit or generate local interrupt to inform user’s
program whether the pattern has been debounced and advanced to the next
scanlist entry. Users can also specify one-time or cyclic scanning of scanlist
entries.
This operating mode supports trigger signals for instrument handshaking. For

more information on handshaking signals, please refer to section 4.3

.

4.3 Handshaking

In the Auto-scan mode, ADLINK PXI switch module accepts Trigger In and
generates Scanner Advanced signal to synchronize relay switching and
measurements with PXI instruments or external measurement devices.

Trigger In

The Trigger In signal from PXI instruments or external measurement devices

instruct the ADLINK PXI switch module to update the relay pattern according to
the one specified in the scanlist entry.

Users may specify wait-for-trigger instruction in a scanlist entry, to have the

switch module wait for the Trigger In before relay pattern is updated. The
polarity of Trigger In can be set to either rising-edge or falling-edge active.

For more information on scanlist configuration, please refer to the software
programming users’ guide.

12 • Operation Theorem

Figure 4 illustrates the available signal sources for the Trigger In signal. Signal
names in the solid-line box represent the external (physical) signal on
connectors, and signals in the dotted-line box represents switch module’s
internal signal.

Software Trigger

TRG_IN

Trigger Bus

AUX[7…0]

Star Trigger In

Figure 4: Available signal sources for Trigger In

Trigger In Signal

Scanner Advanced

After updating the relay pattern, the switch module starts its debounce timer
and waits for the relay contacts to settle. When the debounce time elapses, the

switch module will generate a Scanner Advanced signal to notify the PXI

instruments or external measurement devices that the relay contacts have
settled, and ready to take a new measurement.

The waveform, polarity and pulse width of Scanner Advanced signal can also

be software programmed.

For more information on scanlist configuration, please refer to the software
programming users’ guide.

Figure 5 illustrates the available signal destinations for the Scanner Advance d

signal. Signal names in the solid-line boxes represent the external (physical)
signal on connectors, while signals in the dotted-line boxes represent switch
module’s internal signal.

Scanner Adv.

inl

Figure 5: Available signal destinations for Scanner Advanced

S_ADV

Trigger Bus [7…0]

AUX [7...0]

Star Trigger Out

Operation Theorem • 13

Handshaking protocol

Figures 6 and 7 depict the relationship between Tr igger In, Scanner Advanced,

and relay pattern in handshaking mode. In Figure 7 the Scanner Advanced is
set to pulsating mode.

Trigger In

Scanner Advanced

Relay status

Operation start

Figure 6: Handshaking operation (Scanner Advanced set in pulsating mode)

Trigger In

Scanner Advanced

T

S

T

A1

#0 Pattern #2Pattern #1 Pattern #3 #4

TS

TA1

TS

TA2

TS

TA2

TS

T

TS

A

T

A

Relay status

#0

Pattern #2Pattern #1

Operation start

Figure 7: Handshaking operation (Scanner Advanced set in toggling mode)

14 • Operation Theorem

Pattern #3 #4

Once the operation starts and has received a Trigger In signal, the switch
module updates the relay pattern to that specified in the first entry of scanlist.

is the default debounce time for a switch module, i.e. 8 ms for PXI-7901. T

T

S

An

is the user specified scan delay time in the scanlist entry, indicating the time
between the relay being debounced and the exact moment that a measurement
device takes a new measurement. The actual delay time would be the greater
of the two times, to guarantee that measurement devices take measurements
after the signal path is fully settled, and the relays switch as close as possible to
their maximum operating speed.

As the scan delay time elapses, the switch module generates Scanner
Advanced signal to inform the measurement device to take a new

measurement.

After the measurement completes, the measurement device will generate

another Trigger In signal to have the switch module update the relay pattern to

that specified in the second entry of scanlist.

The handshaking process will continue, until it reaches the end of the scanlist
(if one-time scanning mode is selected), or when a software scan-abort
command is received.

Connecting, Trigger and Synchronize with External DMM

In this example, Agilent® 33401A 6-1/2 Digital Multimeter (DMM) is used to
demonstrate signal connection for handshaking operation.

The DMM provides two terminals on the rear panel for the handshaking

operation process, Tr i g I n and VM Comp. The Tr i g I n connects to the Scanner
Advanced output on switch module, while the VM Comp to Trigger In. If the
terminal board is used, wire Tr i g I n to TRG_IN on terminal board, and the VM
Comp to S_ADV.

Follow the instructions below to ensure the handshake functions properly:

1. Configure ADLINK PXI switch module’s Tr i gger In to rising-edge
triggered, Scanner Advanced output in active-low pulsating

mode with pulse width of at least 2us.

2. Configure the DMM to wait for external Trig In before a
measurement, and generate VM Comp after a measurement.

Arm the DMM to wait for the first trigger.

3. Setup the scanlist and auto-scan mode. The first entry in the

scanlist should be set disable wait for the Trigger In, but enable
Scanner Advanced output. Succeeding entries should enable
both Trigg er I n and Scanner Advanced output. Download the

Operation Theorem • 15

scanlist to the switch module afterward.

4. Start auto-scan by sending scan start command to the switch
module.

ADLINK

PXI Switch module

Scanner Advanced Output

(S_ADV)

Trigger Input

(Trig In)

(TRG_IN)

External Trigger Input

Wiring

Agilent 33401A

6-1/2 DMM

Measurement Complete

(VM Comp)

Figure 8: Signal Connection between Switch Module and Agilent DMM

For more information on scanlist configuration, scan mode setup, start, and
stop functions of the auto-scanning process, please refer to the software
programming users’ guide.

4.4 Trigger Bus

PXI specification defines eight bused-lines across slots in a segment. Users
can route various trigger signal to synchronize multiple PXI instruments, and/or
simplify field wiring across multiple ADLINK Switch Modules.

On ADLINK Switch Modules, the trigger bus driver is disconnected from PXI
trigger bus before users’ configuration.

Figure 9 illustrates the available signal destinations for Trigger Bus[7..0]. Signal

16 • Operation Theorem

names in the solid-line boxes represent the external (physical) signals on
connectors while signals in the dotted-line boxes represent the switch module’s
internal signal.

Software Trigger

Trigger In Signal

Scanner Adv. Signal

AUX [3…2]

Star Trigger In

WDT Overflow

SHDNn

Figure 9: Available signal sources for Trigger Bus[7..0]

Trigger Bus[7..0]

4.5 Star Trigger

The PXI specification defined 13 matched trigger lines to connect to the first 13
PXI peripheral slots on a PXI backplane. Users can route various trigger signal
to synchronize multiple PXI instruments and achieve tight timing control.

On ADLINK Switch Modules, the star trigger driver is disconnected from the PXI
backplane before users’ configuration. The maximum skew between each star
trigger line is controlled to within 1ns.

Note the reverse input voltage protection range is -0.5V to +5.5V. When the
local bus is used on peripheral modules, make sure that the voltage level is
compatible with ADLINK Switch Module.

Figure 10 illustrates the available signal destinations for Star Trigger. Signal
names in the solid-line boxes represent the external (physical) signal on
connectors, while signals in the dotted-line boxes represent the switch module’s
internal signal.

Operation Theorem • 17

Software Trigger

Trigger In Signal

Scanner Adv. Signal

Star Trigger Out Trigger Bus [7…0]

AUX [7…0]

WDT Overflow

SHDNn

Figure 10: Available signal sources for Star Trigger

4.6 Auxiliary Digital I/O

The eight auxiliary digital I/O lines on ADLINK Switch Modules provide
versatility to users’ control applications. Each digital I/O line can be input, output
or tri-stated. When in output mode, users can still read back the actual logic­level on the I/O line. All digital lines are pulled-up to 5V with 10k ohm input
resistance.

Note that AUX[2..0] are dual function pins, driving these pins while enabling
handshaking or emergency shutdown functions, may falsely trigger the Switch
Module or external instruments.

Tri-state
Control

5VDC

10KΩ

DO

DI

Feedback from output

Figure 11: Auxiliary Digital I/O Function Block

18 • Operation Theorem

Bus-Switch

and Protection

AUX Pin

4.7 Hot-Swap

The Switch Module can be hot-swapped during hardware failure in non­interruptible or high-availability systems where system shutdown is not an
option.

PXI-7901 incorporates an onboard hot-swap control mechanism. However the
extent of the hot-swap functionality support depends on the operating system
and the PXI platform.

Microsoft Embedded XP
system automatically releases system resources when a switch module is
extracted and recognizes the new device.

To remove a switch module, first release the screws on the front panel then
push down the red latch on the ejector. When the blue LED turns on, the Switch
module is ready to be removed by fully pushing down the ejector.

To insert another switch module, align the module’s edge with the card guide in
the PXI chassis. Slide the switch module into the chassis, until there is
resistance from the PXI connector. Push the ejector up and fully insert the
switch module into the chassis, a click should be heard from the ejector latch.
The blue LED on the front panel of the switch module will switch off when it is
ready for operation. Tighten the screws on the front panel.

Note: Microsoft Windows 2000
PXI-7901 can be hot-swapped by manual control via an additional hot-swap
driver. For the hot-swap driver on Windows 2000 and other operating systems
such as Linux, VxWorks, etc., please contact ADLINK for more information.

®

supports the native hot-swap function. The operating

®

does not natively support hot-swap however,

4.8 Emergency Shutdown

In safety-critical applications, users can enable the emergency shutdown
function on PXI Switch Module, to manually set the relay pattern to preset state.

To access this function, users must first configure the emergency shutdown
function by windows API. Generally the trigger source is on the front panel and
connected to a push button, which pulls the SHDNn pin to logic-low when
activated. When multiple PXI Switch modules are installed in a PXI chassis, the
trigger source can be routed through the PXI Trigger Bus and eliminate field
wiring across multiple devices. Figure 12 illustrates available trigger sources for
emergency shutdown. Signal names in the solid-line boxes represent the
external (physical) signal on connectors and signals in the dotted-line boxes
represent the switch module’s internal signal.

Operation Theorem • 19

AUX2/SHDNn

Trigger Bus

Star Trigger In

Shutdown Trigger

Figure 12: Available trigger sources for emergency shutdown

The default relay pattern for emergency shutdown is All-Off on PXI-7901; users
can change the pattern by Windows API.

Upon receiving the emergency shutdown trigger, the Switch Module enters
shutdown mode, and the relay pattern is switched to the preset state. If the

Switch Module is in Auto-scan mode, the updating process would be stopped
immediately; in Direct Update mode where the switch module will not accept

any further update instructions.

To leave emergency shutdown mode, users must call adlSwitch_Recovery in
Windows API. The relay pattern would stay the same as they would in the
emergency shutdown mode, and the scanlist (if set) being rewound to the first
entry.

Note the auxiliary digital I/O function pin AUX2 shares the SHDNn pin; driving
AUX2 to logic-low while the emergency shutdown function is enabled. It will
falsely trigger the Switch Module to enter shutdown mode.

This function is disabled by default. For more information, please refer to the
software programming users’ guide.

4.9 Watchdog Timer

In safety-critical applications, users can enable the watchdog timer function on
PXI Switch Module to automatically set the relay pattern to preset state, in case
the operating system or PXI controller crashes.

To access this function, users must first configure the watchdog timer overflow
trigger source by windows API. Generally the trigger source would come from
the onboard 32-bit watchdog timer. When multiple ADLINK PXI Switch modules
are installed in a PXI chassis, the trigger source can be routed through the PXI
Trigger Bus and eliminate redundant watchdog timer setting on multiple devices.

Figure 13 illustrates the available trigger sources for watchdog timer overflow.
Signal names in the solid-line boxes represent the external (physical) signal on
connectors and signals in the dotted-line boxes represent the switch module’s
internal signal.

20 • Operation Theorem

Int. WDTimer

Trigger Bus

Star Trigger In

WDT Overflow

Figure 13:.Available trigger sources for watchdog timer overflow

The watchdog timer overflow interval can be programmed through Windows
API. After enabling the watchdog timer, users must periodically reset the timer
by software command. If the timer is not being reset within the specified interval,
the switch module will generate an overflow signal and set the relay pattern to
the one specified by users.
This function is disabled by default. For more information, please refer to the
software programming users’ guide.

Operation Theorem • 21

Warranty Policy

Thank you for choosing ADLINK. To understand your rights and enjoy all the
after-sales services we offer, please read the following carefully:

1. Before using ADLINK’s products please read the user manual and follow
the instructions exactly.

2. When sending in damaged products for repair, please attach an RMA
application form.

3. All ADLINK products come with a two-year guarantee, repaired free of
charge.

• The warranty period starts from the product’s shipment date from

ADLINK’s factory.

• Peripherals and third-party products not manufactured by ADLINK

will be covered by the original manufacturers’ warranty.

• End users requiring maintenance services should contact their local

dealers. Local warranty conditions will depend on local dealers.

4. This warranty will not cover repair costs due to:

a. Damage caused by not following instructions.
b. Damage caused by carelessness on the users’ part during product

transportation.

c. Damage caused by fire, earthquakes, floods, lightening, pollution,

other acts of God, and/or incorrect usage of voltage transformers.

d. Damage caused by unsuitable storage environments (i.e. high

temperatures, high humidity, or volatile chemicals.
e. Damage caused by leakage of battery fluid.
f. Damage from improper repair by unauthorized technicians.
g. Products with altered and/or damaged serial numbers.
h. Other categories not protected under our guarantees.

5. Customers are responsible for shipping costs to transport damaged
products to our company or sales office.

6. To ensure the speed and quality of product repair, please download a
RMA application form from our company website: www.adlinktech.com.
Damaged products with attached RMA forms receive priority.

For further questions, please contact our FAE staff.

ADLINK: [e-mail]

Warranty Policy • 23