Tektronix VX4469A User Manual
User Manual
VX4469A
ARINC 629 Communication Module
070-9147-01
This document supports firmware version 1.00
and above.
Copyright E T ektronix, Inc. All rights reserved.
T ektronix products are covered by U.S. and foreign patents, issued and pending. Information in this publication supercedes
that in all previously published material. Specifications and price change privileges reserved.
Printed in the U.S.A.
T ektronix, Inc., P.O. Box 1000, Wilsonville, OR 97070–1000
TEKTRONIX and TEK are registered trademarks of T ektronix, Inc.
WARRANTY
T ektronix warrants that this product will be free from defects in materials and workmanship for a period of three (3) years
from the date of shipment. If any such product proves defective during this warranty period, T ektronix, at its option, either
will repair the defective product without charge for parts and labor, or will provide a replacement in exchange for the
defective product.
In order to obtain service under this warranty, Customer must notify Tektronix of the defect before the expiration of the
warranty period and make suitable arrangements for the performance of service. Customer shall be responsible for
packaging and shipping the defective product to the service center designated by T ektronix, with shipping charges prepaid.
T ektronix shall pay for the return of the product to Customer if the shipment is to a location within the country in which the
T ektronix service center is located. Customer shall be responsible for paying all shipping charges, duties, taxes, and any
other charges for products returned to any other locations.
This warranty shall not apply to any defect, failure or damage caused by improper use or improper or inadequate
maintenance and care. T ektronix shall not be obligated to furnish service under this warranty a) to repair damage resulting
from attempts by personnel other than T ektronix representatives to install, repair or service the product; b) to repair
damage resulting from improper use or connection to incompatible equipment; or c) to service a product that has been
modified or integrated with other products when the effect of such modification or integration increases the time or
difficulty of servicing the product.
THIS WARRANTY IS GIVEN BY TEKTRONIX WITH RESPECT TO THIS PRODUCT IN LIEU OF ANY
OTHER WARRANTIES, EXPRESSED OR IMPLIED. TEKTRONIX AND ITS VENDORS DISCLAIM ANY
IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
TEKTRONIX’ RESPONSIBILITY TO REPAIR OR REPLACE DEFECTIVE PRODUCTS IS THE SOLE AND
EXCLUSIVE REMEDY PROVIDED TO THE CUST OMER FOR BREACH OF THIS WARRANTY. TEKTRONIX
AND ITS VENDORS WILL NOT BE LIABLE FOR ANY INDIRECT , SPECIAL, INCIDENTAL, OR
CONSEQUENTIAL DAMAGES IRRESPECTIVE OF WHETHER TEKTRONIX OR THE VENDOR HAS
ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES.
EC Declaration of Conformity
We
Tektronix Holland N.V.
Marktweg 73A
8444 AB Heerenveen
The Netherlands
declare under sole responsibility that the
VX4469A and all options
meets the intent of Directive 89/336/EEC for Electromagnetic Compatibility.
Compliance was demonstrated to the following specifications as listed in the Official
Journal of the European Communities:
EN 55011 Class A Radiated and Conducted Emissions
EN 50081-1 Emissions:
EN 55022 Class B Radiated and Conducted Emissions
EN 50082-1 Immunity:
IEC 801-2 Electrostatic Discharge Immunity
IEC 801-3 RF Electromagnetic Field Immunity
IEC 801-4 Electrical Fast Transient/Burst Immunity
IEC 801-5 Power Line Surge Immunity
To ensure compliance with EMC requirements this module must be installed in a
mainframe which has backplane shields installed which comply with Rule B.7.45 of
the VXIbus Specification. Only high quality shielded cables having a reliable,
continuous outer shield (braid & foil) which has low impedance connections to
shielded connector housings at both ends should be connected to this product. In
addition, each twisted pair in the cable connected to the S2 port should be individually
shielded.
Table of Contents
Getting Started
Operating Basics
General Safety Summary vii. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Service Safety Summary xi. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Preface xiii. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Product Description 1–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Accessories 1–4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Controls And Indicators 1–6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Configuration 1–8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installation 1–11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installation Checklist 1–13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Functional Check 2–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Functional Overview 2–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Power-on 2–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
VXIbus Basics 2–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
ARINC 629 2–6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Protocol Timers 2–6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Modes 2–7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Instrument I/O 2–7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Syntax and Commands
Status and Events
Command Syntax 3–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Functional Command Groups 3–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
System Commands 3–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Module Commands 3–4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Command Summary 3–4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Command Descriptions 3–11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Programming Examples 3–139. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Status 4–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Power LED 4–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Failed LED 4–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
MSG LED 4–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
ERROR 4–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
BACKGROUND 4–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
LED 4–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Events 4–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
VX4469A ARINC 629 Communication Module User Manual
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Table of Contents
Appendices
Appendix A: Specifications A–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Appendix B: Input/Output Connections B–1. . . . . . . . . . . . . . . . . . . . . . . .
Appendix C: Trigger Lines C–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Appendix D: Performance Verification D–1. . . . . . . . . . . . . . . . . . . . . . . . .
Appendix E: Front Panel Data Port E–1. . . . . . . . . . . . . . . . . . . . . . . . . . .
Appendix F: Error Register F–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
String Error (Bit 15) F–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
TXE: Transmitter Enable (Bit 14) F–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
XERF: Transmit Error Flag (Bit 13) F–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
TX Monitor Error (Bits 12, 11, 10) F–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
PAM Errors (Bits 9, 8) F–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
No Bus Acknowledge, Read (Bit 7) F–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
No Bus Acknowledge, Write (Bit 6) F–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
RERF: Receive Error Flag (Bit 5) F–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Parity Error (Bit 4) F–4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Short String Error (Bit 3) F–4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
DATAC Operating Mode (Bits 2, 1) F–4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Impersonation Error F–5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Last Word Monitor F–5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Interrupt Vector Register F–5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Appendix G: Advanced Technical Support G–1. . . . . . . . . . . . . . . . . . . . . .
Application Note G–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Vector Instruction Block Functions G–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Pseudo Bus G–12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Fault Management And Internal T est Functions G–13. . . . . . . . . . . . . . . . . . . . . . . . .
Data Flow Between Backplane And Bus G–17. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
CRC Support G–31. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Memory Switching G–34. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Interrupt Vectors and Timestamp G–36. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
T est Modes G–39. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
ARINC 629 Multi-Transmitter Data Bus G–43. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Appendix H: Options H–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Appendix I: VX4244 Module Quick Reference Guide I–1. . . . . . . . . . . . .
Appendix J: Binary Transfer J–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Appendix K: User Service K–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Preventive Maintenance K–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
User-Replaceable Parts K–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Glossary
ii
VX4469A ARINC 629 Communication Module User Manual
List of Figures
Table of Contents
Figure 1–1: System Configuration 1–5. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 1–2: VX4469A Controls and Indicators 1–6. . . . . . . . . . . . . . . . . .
Figure 1–3: VX4469A Front Panel 1–7. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 1–4: Trigger Lines 1–10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 1–5: Module Installation 1–12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure B–1: VX4469A Front Panel B–1. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure G–1: Pseudo Bus Configuration G–12. . . . . . . . . . . . . . . . . . . . . . . .
Figure G–2: Read Data from Shared Memory Directly G–20. . . . . . . . . . .
Figure G–3: Writing Data to Bus via Writes to Shared Memory G–21. . . .
Figure G–4: Receiving Data from Bus via Circular Buffer G–25. . . . . . . . .
Figure G–5: Writing Data to Bus via a Circular Buffer G–28. . . . . . . . . . .
Figure G–6: Interrupt Vectors G–37. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure G–7: ARINC 629 Terminal G–43. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure G–8: ARINC 629 Data Format G–44. . . . . . . . . . . . . . . . . . . . . . . . .
Figure G–9: Terminal Gap Timer G–46. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure G–10: Power-on Periodic Mode G–46. . . . . . . . . . . . . . . . . . . . . . . . .
Figure G–11: Periodic Mode G–47. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure G–12: Aperiodic Mode G–47. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
VX4469A ARINC 629 Communication Module User Manual
iii
Table of Contents
List of Tables
Table 1–1: Standard Accessories 1–4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 1–2: Optional Accessories 1–4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 2–1: Register Definitions 2–4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 3–1: Interrupt Register Coding 3–66. . . . . . . . . . . . . . . . . . . . . . . . .
Table A–1: Specifications A–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table C–1: VX4469A Trigger Commands C–1. . . . . . . . . . . . . . . . . . . . . .
Table K–1: User-Replaceable Parts K–2. . . . . . . . . . . . . . . . . . . . . . . . . . .
iv
VX4469A ARINC 629 Communication Module User Manual
Table of Contents
VX4469A ARINC 629 Communication Module User Manual
v
Table of Contents
vi
VX4469A ARINC 629 Communication Module User Manual
General Safety Summary
Review the following safety precautions to avoid injury and prevent damage to
this product or any products connected to it.
Only qualified personnel should perform service procedures.
While using this product, you may need to access other parts of the system. Read
the General Safety Summary in other system manuals for warnings and cautions
related to operating the system.
Injury Precautions
Avoid Electric Overload
Ground the Product
Do Not Operate Without
Covers
Use Proper Fuse
Do Not Operate in
Wet/Damp Conditions
Do Not Operate in
Explosive Atmosphere
To avoid electric shock or fire hazard, do not apply a voltage to a terminal that is
outside the range specified for that terminal.
This product is indirectly grounded through the grounding conductor of the
power cord. To avoid electric shock, the grounding conductor must be connected
to earth ground. Before making connections to the input or output terminals of
the product, ensure that the product is properly grounded.
To avoid electric shock or fire hazard, do not operate this product with covers or
panels removed.
To avoid fire hazard, use only the fuse type and rating specified for this product.
To avoid electric shock, do not operate this product in wet or damp conditions.
To avoid injury or fire hazard, do not operate this product in an explosive
atmosphere.
VX4469A ARINC 629 Communication Module User Manual
vii
General Safety Summary
Product Damage Precautions
Use Proper Fuse
Use Proper Power Source
Provide Proper Ventilation
Do Not Operate With
Suspected Failures
To avoid fire hazard, use only the fuse type and rating specified for this product
Do not operate this product from a power source that applies more than the
voltage specified.
To prevent product overheating, provide proper ventilation.
If you suspect there is damage to this product, have it inspected by qualified
service personnel.
Safety Terms and Symbols
Terms in This Manual
These terms may appear in this manual:
WARNING. Warning statements identify conditions or practices that could result
in injury or loss of life.
Terms on the Product
viii
CAUTION. Caution statements identify conditions or practices that could result in
damage to this product or other property.
These terms may appear on the product:
DANGER indicates an injury hazard immediately accessible as you read the
marking.
WARNING indicates an injury hazard not immediately accessible as you read the
marking.
CAUTION indicates a hazard to property including the product.
VX4469A ARINC 629 Communication Module User Manual
General Safety Summary
Symbols on the Product
The following symbols may appear on the product:
DANGER
High Voltage
Protective Ground
(Earth) T erminal
ATTENTION
Refer to
Manual
Double
Insulated
VX4469A ARINC 629 Communication Module User Manual
ix
General Safety Summary
x
VX4469A ARINC 629 Communication Module User Manual
Service Safety Summary
Only qualified personnel should perform service procedures. Read this Service
Safety Summary and the General Safety Summary before performing any service
procedures.
Do Not Service Alone
Disconnect Power
Use Care When Servicing
With Power On
Do not perform internal service or adjustments of this product unless another
person capable of rendering first aid and resuscitation is present.
To avoid electric shock, disconnect the main power by means of the power cord
or, if provided, the power switch.
Dangerous voltages or currents may exist in this product. Disconnect power,
remove battery (if applicable), and disconnect test leads before removing
protective panels, soldering, or replacing components.
To avoid electric shock, do not touch exposed connections.
VX4469A ARINC 629 Communication Module User Manual
xi
Service Safety Summary
xii
VX4469A ARINC 629 Communication Module User Manual
Preface
Conventions
This is the user manual for the VX4469A ARINC 629 Communication Module.
Please read and follow all instructions for installation and configuration. Use the
Installation Checklist to insure proper installation, and as a record of initial
settings.
This manual assumes you are familiar with VXIbus instruments and operation,
and with the purpose and function of this instrument. The Operating Basics
section gives a summary of VXIbus operation, and presents an overview of this
instrument’s operation.
The Syntax and Commands section has a summary of all the commands, and
detailed descriptions of each command. You may also wish to make a copy of
the Quick Reference Guide, located in Appendix I, to keep by the instrument.
The names of all switches, controls, and indicators appear in this manual exactly
as they appear on the instrument.
Specific conventions for programming are given in the sections Syntax and
Commands and in Programming Examples.
VX4469A ARINC 629 Communication Module User Manual
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Preface
xiv
VX4469A ARINC 629 Communication Module User Manual
Getting Started
Getting Started
Product Description
This section begins with a brief description of the VX4469A, and then explains
how to configure and install the module in a VXIbus mainframe. Then you can
choose to perform the quick functional check, also included in this section, to
gain confidence that the instrument operates properly.
The VX4469A ARINC 629 Communication Module supports from one to three
ARINC 629 terminals. The standard board has one terminal. One or two
additional terminals are available as options. The VX4469A is designed to
transmit and receive data on ARINC 629 buses through a current (transformer)
coupling device that interfaces to the bus itself. Data to be transmitted is stored
in system memory shared by the terminal IC and an on-board 80186 processor.
The transmit schedule and system memory data locations are stored in a
Transmit Personality PROM (XPP). Data that is received is stored in the same
system memory. A Receive Personality PROM (RPP) and a Multiple Personality
PROM (MPP) contain information on which data to receive and where to store it
in the shared system memory.
Note that the VX4469A actually uses RAM instead of PROM for storing XPP,
RPP, and MPP information. All references to personality PROMs in this manual
are actually references to RAM locations.
Each ARINC 629 terminal on the VX4469A Module consists of:
H System memory shared by the VX4469A 80186 controller and each
terminal. It is used to store received data and data to be transmitted.
H A personality RAM that contains the information on what data to transmit
and receive and the data’s location in shared memory.
H A terminal protocol IC which interprets the personality PROM and translates
data to/from 16-bit shared memory words and Manchester bit serial
encoding.
H A Serial Interface Module (SIM) that modulates/demodulates the Manchester
coding and is intended to drive a current coupler on a twisted pair bus.
H An external trigger interface through the front panel and a VXI TTL trigger
interface through the backplane.
VX4469A ARINC 629 Communication Module User Manual
1–1
Getting Started
NOTE. To help insure optimum ARINC 629 compatibility, each terminal uses the
VLSI Terminal IC and Serial Interface Module (SIM) technology developed by
Boeing.
A pseudo bus module that replaces the SIM and provides a voltage bus without
SIMs or current couplers is also available. Appendix G gives additional
information on the pseudo bus module.
The VX4469A allows you to program the Personality PROMs (RAMs) and to
read and write data from/to the shared memory.
The VX4469A also has two test modes. The test modes allow transmitting data
with Manchester, parity and timing errors as well as causing collisions on the
ARINC 629 bus.
Terminal Programmability
ARINC 629
Each terminal is software programmable for transmit interval, terminal gap, sync
gap, block/independent mode, and alternate mode. Each terminal may be
disabled individually. The three terminals may all be on the same bus or they
may be on two or three different busses. Terminals may also be configured to be
receive only.
The 32 MHz clock for the processor and terminal ICs may be provided externally to test external systems’ sensitivity to clock frequency. There are time stamp
clock and time stamp clock reset inputs and outputs to allow synchronizing time
on several systems.
ARINC 629 is a bit-serial, time-multiplexed, multiple-transmitter, data bus
developed for use primarily on certain commercial aircraft. All data transmitted
on the ARINC 629 bus consists of at least a label, followed by up to 256 16-bit
data words.
Data to be transmitted or received is placed in a terminal’s shared memory by an
on-board 80186 processor. The terminal IC uses a sophisticated built-in data
management scheme to read the personality PROM and manage transmission
and reception.
The basic unit of data transmission is a wordstring. A wordstring consists of a
label and between 0 and 256 data words. A given terminal is allowed to transmit
up to 31 wordstrings per transmission.
1–2
Protocol Timers
Each terminal determines when to transmit by using three timers and by
monitoring bus activity. The first timer, Transmit Interval, determines the
minimum amount of time a terminal waits between transmissions.
VX4469A ARINC 629 Communication Module User Manual
Getting Started
The second timer, Sync Gap, is used to insure that all terminals can transmit
before any terminal re-transmits, and insures that there is a bus quiet time at least
Sync Gap long after each terminal has transmitted.
The third timer, Terminal Gap, determines which terminal transmits first if two
or more terminals’ Transmit Interval timers have elapsed and the bus is busy.
Modes
Transmit Schedules
The VX4469A supports both Periodic and Aperiodic modes. In Periodic mode,
the transmit interval time is longer than the time required for all terminals to
complete one transmission. In Aperiodic mode, after all terminals have transmitted, none will transmit again until there has been a bus quiet time of Sync
Gap. Thereafter the terminals will tend to transmit in Terminal Gap order,
shortest to longest.
A bus that is not fully loaded runs in Periodic mode, while a bus with terminals
transmitting more data than will fit in the transmit interval will automatically run
in Aperiodic mode. A bus will normally switch between Periodic and Aperiodic
modes as terminals have more or less data to transmit.
The order in which a terminal transmits data is determined by the contents of the
Transmit Personality PROM. The Transmit Personality PROM is a 31 row by 31
column arrangement in RAM and is fully user-programmable.
There are three modes of scheduling: Block, Independent and Alternate. In Block
mode, the wordstrings described in a single row are transmitted. Independent
mode transmits one wordstring from each column of the array. Alternate mode
can only be entered from Block mode. It is similar to Block mode with its first
row number defined in the first control cell. The terminal IC can be switched
back and forth between Block mode and Alternate mode while the bus is in
operation.
Fuses
BITE (Built-In Test
Equipment)
VX4469A ARINC 629 Communication Module User Manual
The VX4469A Module has 5 VDC and ±24 VDC fuses. The fuses protect the
module in case of an accidental shorting of the power bus or any other situation
where excessive current might be drawn.
If the +5 V fuse opens, the VXIbus Resource Manager will be unable to assert
SYSFAIL INHIBIT on this module to disable SYSFAIL*.
If any fuse opens, the fault must be removed before replacing the fuse. Refer to a
qualified service person for assistance.
Built in Test Equipment (BITE) uses regular data transmissions to check SIM
and coupler functionality, so as not to corrupt operation of the bus. The SIM
constantly monitors the wraparound path, including itself and the selected
channel. In addition, a special test function is available which selects and
monitors the spare coupler channel, and then reports the results. Visual BITE is
1–3
Getting Started
provided for each terminal through a series of LEDs that indicate terminal active,
string active, receive error, transmit error, bus busy, and transmit enable. The
processor also has an LED indicating that an error has occurred, and another
LED is toggled on and off while the processor is idling, giving an indication of
how busy the processor is.
Binary Transfer
Accessories
Refer to Appendix J: Binary Transfer for information relating to National
Instruments GPIB-VXI/C Slot 0 modules.
Table 1–1 lists the standard accessories included with the VX4469A.
T able 1–1: Standard Accessories
Accessory Part Number
VX4469A User Manual 070-9147-XX
Table 1–2 lists the optional accessories for the VX4469A.
T able 1–2: Optional Accessories
Accessory Part Number
Adds one additional terminal VX4469A-01
Adds two additional terminals VX4469A-02
Pseudo-bus SIM See Appendix G for
information
1–4
VX4469A ARINC 629 Communication Module User Manual
Getting Started
Figure 1–1: System Configuration
VX4469A ARINC 629 Communication Module User Manual
1–5
Getting Started
Controls And Indicators
The following controls and indicators are provided to select and display the
functions of the VX4469A Module’s operating environment. See Figures 1–2
and 1–3 for their physical locations.
Figure 1–2: VX4469A Controls and Indicators
Switches
1–6
The following switches must be correctly set to insure proper operation. See
Configuration for details of how to set the switches.
Logical Address Switches
VMEbus Interrupt Level Select Switch
Jumpers
VX4469A ARINC 629 Communication Module User Manual
Pin 1
Getting Started
Pin 1
Figure 1–3: VX4469A Front Panel
VX4469A ARINC 629 Communication Module User Manual
1–7
Getting Started
LEDs
Configuration
Logical Address Switches
The following LEDs are visible at the top of the VX4469A Module’s front panel
to indicate the status of the module’s operation. See Status and Events for a
description of each LED’s meaning.
Power LED
Failed LED
MSG LED
Error LED
Background LED
The following switches must be correctly set to insure proper operation. Refer to
Figure 2 for their physical locations.
Each function module in a VXIbus System must be assigned a unique logical
address, from 1 to 255 decimal. The base VMEbus address of the VX4469A is
set to a value between 1 and FFh (255d) by two hexadecimal rotary switches.
Align the desired switch position with the arrow on the module shield.
The actual physical address of the VX4469A Module is on a 64 byte boundary. If
the switch representing the most significant digit (MSD) of the logical address is
set to position X and the switch representing the least significant digit (LSD) of
the logical address is set to position Y, then the base physical address of the
VX4469A will be [(64d * XYh) + 49152d]. For example:
1–8
IEEE-488 Address
L.A. MSD LSD Base Physical Address (d)
Ah 0 A (64 * 10) + 49152 = 49792d
15h 1 5 (64 * 21) + 49152 = 50496d
where:
L.A. = Logical Address
MSD = Most Significant Digit
LSD = Least Significant Digit
Using the VX4469A Module in an IEEE-488 environment requires knowing the
module’s IEEE-488 address in order to program it. Different manufacturers of
IEEE-488 interface devices may have different algorithms for equating a logical
address with an IEEE-488 address. Consult the operating manual of the Resource
Manager/IEEE-488 Interface Module being used for additional information.
VX4469A ARINC 629 Communication Module User Manual
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