PC-462LV
LabVIEW
Virtual Instrument software
for PC-462 Programmable Power Supply
FEATURES
Supports DATEL's PC-462 precision programmable
power supply board for PC/AT bus computers
Runs under Microsoft Windows
, uses Dynamic Data
Exchange (DDE)
Adaptable to all National Instruments LabVIEW
applications
Easy-to-use visual programming eliminates low-level
software
Interactive, user-configurable front panel controls
Integrates current and voltage generation, monitoring,
and display
4 independently programmable voltage output
Includes current limiting and remote sensing
Dedicated and general purpose analog input and digital I/O
All channels fully isolated from the host computer
National Instruments' LabVIEW transforms DATEL's PC-462
high precision programmable power supply boards into easy-to-
use virtual instruments (VI's) that generate and monitor current
and voltage levels in real time. Low-level software development
is replaced by an intuitive visual programming system that
harnesses all the power of Microsoft Windows including graphic
user interface (GUI), access to more host memory (16
megabytes), multi-tasking, and inter-process communications
using DDE. Typical applications include laboratory power
sourcing, automated dynamic testing, motor control, calibration,
simulation, relay switching, and thermocouple characterization.
The PC-462 is a high-precision, low-cost, programmable
power supply board for IBM-PC/AT, PS-30, EISA bus, and
compatible computers. Four output channels can be
individually selected by software for ranges up to 6.1425V at
1Amp and up to 20.475V at 250 milliamps. Each channel
includes output current limiting that protects it from overload
and short circuit conditions while remote voltage sensing
Figure 1. PC-462LV LabVIEW System Diagram
PRODUCT DATA
allows regulation with respect to the load. Local voltage and
current levels can be monitored in real time by host software.
Four general purpose analog input channels as well as four digital
I/O lines are provided for monitor and control of external devices.
Two MOSFET digital output lines can switch loads up to 300V at
100 milliamps, making them ideal for switching relays and triac
circuits. All input and output channels provide 250V rms isolation
from the PC bus. LabVIEW's feature-rich program development
system combined with DATEL's library of VI functions in PC-462LV
provide the essential building blocks to create any conceivable
LabVIEW application using the PC-462 board.
Graphical programming works like a flowchart- when the
flowchart is complete, the program is done. PC-462LV offloads
as much programming as possible into the LabVIEW environment
so the user has maximum control. It creates a library of fast,
simple, highly modular VI functions for the PC-462 that do not
sacrifice board performance. The user builds VI's to configure the
hardware, generate different output voltage levels, and read back
L a b V I E W
W i n d o w s
P C - 4 6 2
P r e c i s i o n , p r o g r a m m a b l e
p o w e r s u p p l y b o a r d
f o r P C / A T b u s c o m p u t e r s
H o s t C o m p u t e r
L a b V I E W
+ P C - 4 6 2 L V V I ' s
R e a l t i m e
D i s p l a y
I n i t i a l i z e t h e
P C - 4 6 2
S e t C h a n n e l
O u t p u t s
F r o n t P a n e l C o n t r o l s
V i s u a l P r o g r a m m i n g D i a g r a m
C h 0 ( V ) C h 1 ( V ) C h 2 ( V ) C h 3 ( V )
C h 0 ( A ) C h 1 ( A ) C h 2 ( A ) C h 3 ( A )
S e t O u t 0
S e t O u t 1
S e t O u t 2
S e t O u t 3
M e a s u r e V o l t a g e
& C u r r e n t O u t p u t s
DATEL, Inc., Mansfield, MA 02048 (USA)
Tel: (508)339-3000, (800)233-2765 Fax: (508)339-6356
Email: sales@datel.com
Internet: www.datel.com
141
PC-462LV
DATEL, Inc., Mansfield, MA 02048 (USA)
Tel: (508)339-3000, (800)233-2765 Fax: (508)339-6356
Email: sales@datel.com
Internet: www.datel.com
Ordering Guide
Figure 2. Typical PC-422LV Visual Program
All software is supplied on 3.5 inch MS-DOS diskettes.
PC-462LV
LabVIEW virtual instrument library software for DATEL's PC-462 family of high-precision programable
power supply boards. Executable files only. Includes user manual. Requires LabVIEW on host.
PC-462LVS
Fully commented "C" source code for PC-462LV. Written under Borland C++ (Ver. 3.1) and Watcom (Ver. 9.01)
compilers. Also includes executable files. Shipped with a user manual. Requires LabVIEW on host.
PC-462
Precision programmable power supply board for PC/AT bus computers and compatibles. Provides 4
programmable output channels, 12 local voltage/current A/D read-back channels, 4 general purpose analog
inputs, and two high-power (MOSFET) digital input and output lines. All channels are fully isolated.
PC-462SET
Virtual instrument software utility for Windows. Executable files only.
PC-462SRC
Complete source code listing for PC-462SET, written under BorlandC (Version 3.1) and Microsoft Visual BASIC
under Windows. Includes full source and executable files. the software is shipped with a user's manual.
PC-462DRV
Dynamic linked library (DLL) files for PC-462 programming, fully commented and written under Borland C
(Version 3.1). Highly portable. Supplied free with each PC-462 board.
PC-490A/B
Screw termination adapter to facilitate input/wiring (-490A DB-9, 9 pin, -490B DB25, 25-pin).
LabVIEW is a trademark of National Instruments
Windows is a trademark of Microsoft
IBM-PC/AT is a trademark of IBM Corp.
local and remote voltage/current values without writing programs.
All VI's are assembled graphically using a mouse and can be
edited at any time to modify functionality or appearance. Non-
stop, dynamic voltage and current generation and monitoring
continues on the PC-462 while LabVIEW simultaneously
maintains the GUI. Easily customized, interactive user interfaces
can be created from the vast library of front panel controls and
displays offered by LabVIEW.
PC-462LV includes extensive Dynamic Linked Library (DLL)
functions that perform the PC-462 low-level hardware
programming operations transparently. The software provides
VI functions that poll PC-462 status flags and read current and
voltage levels independent of, and simultaneous with, power
waveform generation and display. Control is retained by the
user as long as LabVIEW continues to execute correctly.
The multi-window, visual programming environment facilitates
building and accessing hierarchical VI programs. Multi-tasking
allows context switches to other concurrent Windows applications
without interrupting PC-462 operation. DDE facilitates data
exchange with other software programs, e.g. spreadsheets for
data logging.
The entire PC-462LV -LabVIEW combination uses only a few
VI functions that are easy to understand and incorporate into a
"block diagram" program. The basic concept is to initialize the
PC-462 hardware and set up the voltage on each of the four
output channels. VI's are also supplied to monitor local and
external voltage and current levels in real time. Figure 2
illustrates the simplicity of the Vi programming system.
Virtual Instrument Library
In summary, PC-462LV includes the following VI functions:
PC-462 Initialize
Initialize the PC-462 hardware.
Set Trigger Source
Select internal or external triggering for
the A/D section, i.e. current/voltage
read back.
Update Outputs
Set the output voltage levels.
Measure Outputs
Monitor the local current and voltage
levels on each channel.
Read A/D Channels
Read the analog levels on the general
purpose A/D input lines.
Digital Outport
Update the digital output lines.
Digital Inport
Read the digital input lines.
SetA/D Channel
Specify different analog input channels.
Start A/D
Start the A/D converter.
Read Status
Return the A/D conversion status.
Read A/D Data
Read the A/D data when a conversion
is complete.
PC-462 Demo
Complete voltage setup and real-time
monitor demonstration VI.
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