HP 61010A Owner's Manual page 7

1
_
Introducing
the HP
PC Instruments
Digital I/O
Product Description___
The HP PC Instruments Digital I/O is an instrument that
can send and receive 16-bit data words through the input
and output connectors on the front of the unit. It does this
under the control of a computer that is equipped with PC
Instruments software and an interface card. The System
Owner's Manual tells you all you need to know about the
required software and interface card for your computer.
Chapters 2 and 3 of this manual explain how to operate
the Digital I/O " manually" using the Soft Front Panel
(computer display) while Chapter 5 describes programming
statements you can use to control it from BASIC.
Figure 1-1 is a block diagram that illustrates the two
primary functions to the Digital I/O. These functions are:
Digital Input and Digital Output. The 16 data bits of both
the Digital Input and Digital Output can be addressed
individually or simultaneously as a word. In this way you
can specify variable length data words up to 16 bits long
as well as their location on the input and output
connectors.
The input data bits are compatible with all logic levels.
Programmable circuitry on the instrument allows you to
specify an input threshold level. The output data bits can
be programmed to be compatible with either TTL or open
collector logic levels. In addition to the 16 data bits, the
input connector and the output connector also contain two
control signals and four digital commons each. Complete
specifications are given in Table 1-1.
Product Description 1*1