Omega Engineering OMB-CHARTSCAN 1400, Руководство пользователя

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Configuration Aspects for Programmers Appendix B
B-28 ChartScan User’s Manual
Digital I/O Operation
As shown in the DB50 pinout in the Installation and Configuration section, ChartScan has digital I/O pins for
eight inputs and thirty-two outputs (see note). The digital outputs can be controlled either
automatically via the
alarm settings or with programming using the Set Digital Outputs (
O
) command. To determine the digital
output state, use the
O?
command.
With the Set Digital Outputs (
O
) command you can output a byte for each output bank and specify which output
bits should be cleared (logic false) or set (logic true). The
O
command will override the digital output states as
set by the alarm condition. Refer to the Command Reference section of this manual for details.
Each digital output line will drive five (5) standard TTL loads. Each digital input line is one-eighth (0.125) TTL
load. All inputs are protected against damage from high static voltages. Normal precautions should be taken to
limit the input voltages to 0.3 to 5.3 volts. All digital I/O lines are referenced to digital ground.