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2 Contents
Chapter 3
VXI Programming Using the IEEE 1394 Serial Bus ................................................ 35
Using this Chapter ...................................................................................................... 35
Programming Register-Based and Message-Based VXI Instruments ................. 35
Opening Instrument Sessions .............................................................................. 35
Optimizing Programs ..........................................................................................36
Block Data Transfers ....................................................................................36
Block Transfers using HP VXIplug&play Drivers ....................................... 37
Block Transfers using HP VISA ................................................................... 40
HP E8491A Triggering .......................................................................................43
Using Triggers ..............................................................................................43
Configuring the E8491A Trig In and Trig Out Ports ................................... 44
Triggering Example ......................................................................................45
Trigger Pull Up ............................................................................................. 47
Using HP E8491A Shared Memory ....................................................................47
Locating E8491A Shared Memory ...............................................................47
Example Programs .............................................................................................. 49
Storing Readings in Shared Memory - HP VISA Example .......................... 50
Storing Readings in Shared Memory - SICL Example ................................54
Chapter 4
IEEE 1394 Fundamentals and
Interface Overview ...................................................................................................... 57
Using this Chapter ...................................................................................................... 57
IEEE 1394 Topology and Terminology .............................................................. 57
Features of the IEEE 1394 Bus ..................................................................... 58
Optimizing the Configuration .......................................................................59
IEEE 1394 Data Transfer Protocol ......................................................................59
Asynchronous Data Transfers ....................................................................... 60
Fair Arbitration Protocol ...............................................................................60
VXI Data Transfers ....................................................................................... 60
The Adaptec® AHA-8940 Host Adapter and Interface Cable ............................ 61
The HP E8491A PC to VXI Interconnect ...........................................................62
Using the HP E8491A with the HP E1406 Command Module .................... 64
The HP I_O Libraries .......................................................................................... 64
Appendix A
Specifications ................................................................................................................65
Interface Characteristics ......................................................................................65
VXI Characteristics ............................................................................................. 65
General .......................................................................................................... 65
CLK 10 ......................................................................................................... 66
External Trigger Input .................................................................................. 66
External Trigger Output ................................................................................ 66
Trigger Delays .............................................................................................. 67
Cooling ......................................................................................................... 67
Power Supply Loading ................................................................................. 67