Printer Accessories User Manual

Contents
GPIB-1014 User Manual x © National Instruments Corporation
68450 DMAC ................................................................................................................ 6-14
DMAC Channel Operation................................................................................ 6-15
Initialization and Transfer Phases ......................................................... 6-15
Device (TLC)/DMAC Communication..................................... 6-15
DMA Requests ........................................................................ 6-16
Data Transfers ........................................................................... 6-16
Operands and Addressing.......................................................... 6-17
Address Register Operation....................................................... 6-17
Transfer Count Register Operation ........................................... 6-17
Initiation and Control of Channel Operation......................................... 6-18
Initiating the Operation ............................................................. 6-18
The Continue Mode of Operation ............................................. 6-18
Halt ............................................................................................ 6-18
Software Abort .......................................................................... 6-18
Interrupt Enable......................................................................... 6-19
Block Termination................................................................................. 6-19
Multiple Block Operations ........................................................ 6-19
Continued Operations................................................................ 6-19
Array Chaining Operations ....................................................... 6-19
Linked Chaining Operations ..................................................... 6-20
Error Conditions ........................................................................ 6-21
GPIB Interface............................................................................................................... 6-23
Test and Troubleshooting.............................................................................................. 6-24
DMA Stand-Alone Testing ............................................................................... 6-24
GPIB Interface Testing...................................................................................... 6-24
Chapter 7
Diagnostic and Troubleshooting Test Procedures
.................................................. 7-1
Interpreting Test Procedures ......................................................................................... 7-1
GPIB-1014 Hardware Installation Tests ....................................................................... 7-2
Appendix A
Hardware Specifications
.................................................................................................. A-1
Appendix B
Parts List and Schematic Diagrams
............................................................................. B-1
Appendix C
Sample Programs
............................................................................................................... C-1
Appendix D
Multiline Interface Messages
......................................................................................... D-1
Appendix E
Operation of the GPIB
...................................................................................................... E-1
Types of Messages ........................................................................................................ E-1
Talkers, Listeners, and Controllers................................................................................ E-1
The Controller-In-Charge and System Controller......................................................... E-2
GPIB Signals and Lines ................................................................................................ E-2