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INTRODUCTION
SECTION
1
The HP 82479A Data Acquisition Pac, together with the HP-71B Handheld Computer and the HP 3421A
Data Acquisition/Control Unit, provide a powerful low-cost data acquisition system. These devices may
be used in the laboratory, the field, or on the production line to gather data, control devices, or report on
equipment status. When combined with devices such as the ThinkJet printer or an 80-column video
interface, the data acquisition system provides system capabilities equivalent to larger, more expensive
systems at a fraction of the cost. Also, in space-critical environments the HP-71 takes less space than the
keyboard of a standard personal computer, leaving room for production or test equipment.
1.1 THE HP-71 COMPUTER
The HP-71 1s a powerful computer that has the following standard features:
e 17.5K-bytes of user memory.
e Powerful BASIC language with over 240 keywords.
e Clock, calendar, and timer system.
User definable keyboard.
Battery operation (continuous memory)
1.2 HEWLETT-PACKARD INTERFACE LOOP
DEVICE 2
DEVICE 1
Information Flow In The Interface Loop
DEVICE 3
The
Hewlett-Packard
Interface
Loop
(HP-IL)
provides additional power and versatility to the
HP-71.
HP-IL is a bit-serial interface designed for
low-cost, battery-powered systems.
The HP-71,
acting as system controller, is capable of transmitting
and receiving data to a wide variety of computers
and peripherals.
In an HP-IL system, the HP-71
and peripherals are connected by two-wire cables
leading from the output port of of one device to the
input port of the next, until all devices form a closed
loop.
1-1
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