ICS ELECTRONICS 4863, Руководство пользователя

Страница: 6 / 167

1-1
1
1
General Information
1.1 INTRODUCTION
This section provides specifications for ICS's Models 4863 and 2363
Parallel Digital Interface Modules. All specifications and functional
descriptions apply to both units unless stated otherwise.
1.2 DESCRIPTION
The Model 4863 GPIB <-> Parallel Interface is an IEEE 488.2/GPIB/HP-
IB compatible device that provides digital signals to drive external devices
and to input digital data onto the GPIB bus from external devices. The
Model 2363 Serial <-> Parallel Interface provides the same digital I/O
capability and GPIB functionality but with RS-232 and RS-422/RS-485
serial interfaces.
Both modules provide 48 programmable digital lines with TTL levels for
controlling devices or for data transfer. The digital interface is user
configurable into gated inputs and/or latched outputs in eight bit increments.
As inputs, each data line has a pullup resistor for sensing contact closures
or for interfacing with CMOS signals. As outputs, each line can source 24
mA or sink up to 48 mA. The interfaces can also monitor 15 of the digital
lines and report any changes to the Bus Controller. The 4863 transfers data
either as the parameter in a command or as a transparent data string. Data
can be formatted as decimal or hex characters or unformatted binary bytes.
Applications include interfacing devices with parallel digital interfaces to
the GPIB bus or to serial links, controlling discrete devices, reading the state
of external switches or signals, and monitoring digital events.