National Instruments GPIB-LPT, Руководство пользователя

Страница: 8 / 47

Contents
GPIB-LPT User Manual viii © National Instruments Corporation
Writing a GPIB-LPT Driver ............................................................................... 5-7
Setup and Initialization ............................................................................ 5-8
Interrupt Handler Routine ....................................................................... 5-8
PRINT Routine ........................................................................... 5-8
Timing Constraints .................................................................................. 5-9
Appendix A
Operation of the GPIB
....................................................................................... A-1
History of the GPIB ....................................................................................................... A-1
Types of Messages ........................................................................................................ A-1
Talkers, Listeners, and Controllers ................................................................................. A-1
System Controller and Active Controller ....................................................................... A-2
GPIB Signals ................................................................................................................. A-2
Data Lines ...................................................................................................................... A-3
Handshake Lines ............................................................................................................ A-3
NRFD (not ready for data) ................................................................................. A-3
NDAC (not data accepted) ................................................................................. A-3
DAV (data valid) ............................................................................................... A-3
Interface Management Lines .......................................................................................... A-4
ATN (attention) .................................................................................................. A-4
IFC (interface clear) ........................................................................................... A-4
REN (remote enable) ......................................................................................... A-4
SRQ (service request) ........................................................................................ A-4
EOI (end or identify) ......................................................................................... A-4
Physical and Electrical Characteristics ........................................................................... A-5
Configuration Restrictions ............................................................................................. A-7
Appendix B
Multiline Interface Messages
........................................................................ B-1
Appendix C
Specifications
............................................................................................................... C-1