Switch signal input interface circuit
Source: InternetPublisher:李商隐身 Keywords: Interface circuit switch signal system settings MDASH Updated: 2020/08/03
In order to realize 4-way process switching signals
and 4-way system setting switch signal input interface
circuit. The process switch or level signal passes through
the optical isolator ICl (TLP521-4). After level conversion,
it enters the three-state isolation buffer IC2 (74LS244) together
with the system setting switch signal
, and is controlled by the address interface
to communicate with the data bus. Lotus connection. The CPU needs to execute an
interface input command to
read the status of the
eight switch signals of PO-P3 and SO-S3 through the bus isolator. In the computer control system, the system setting switches
that need to be designed
include "hard manual and soft manual switches", "forward and reverse
action control switches", "control mode selection switches", etc.
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