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
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