Appendix E
Using HP VEE with the HP E1313/E1413
General
The absolute fastest system performance is obtained with an embedded
computer connected directly to the VXI backplane, running a real time
operating system, and using all custom compiled C code. If this is not
required for your application, or you do not need the absolute fastest
performance, then use this appendix to program the HP E1313/E1413 using
HP VEE. This appendix shows how to get good performance from HP VEE
and the HP E1313/E1413 without writing any compiled C code.
The hardware in the HP E1313/E1413 is designed such that it can constantly
transfer readings to a computer while it continues to take more readings.
The rate at which these readings are transferred determines the rate at which
data can be continuously acquired.
There are three main ways that HP VEE can communicate with the
HP E1313/E1413.
Communication Method
Characteristic
Instrument panel
Easy to use, slow to execute
Direct I/O SCPI commands
Harder to use, medium speed
Direct I/O register access
Hardest to use, fast
How to Use HP VEE with the HP E1313/E1413
A good strategy to use with HP VEE and the HP E1313/E1413 is to use an
instrument panel to send SCPI commands to configure the HP E1313/E1413
as this will be easy, and for the most part, execution speed does not matter.
After the HP E1313/E1413 has been configured using an instrument panel,
then use Direct I/O SCPI commands to start and monitor operations.
Readings should be moved using Direct I/O register access in systems with
a direct backplane connection or with Direct I/O SCPI commands, if a
command module (HP E1406A, for example) is used. Moving data in the
fastest possible manner is described as follows.
1. The HP E1313/E1413 has registers that contain data in 32-bit real
format. This data can be used directly by HP VEE if one requirement
is met. This requirement is to have HP VEE version 3.0 or later for
UNIX
®
controllers or HP VEE version 3.2 for PCs. This version of
HP VEE has a global parameter that must be configured.
Appendix E
Using HP VEE with the HP E1313/E1413 385
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