HP IEEE 1394 - Manual (Page 3)

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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