Bay Technical Associates V79 PDI-1 - Manual (Page 19)

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4.3.10 REPORT A SINGLE BUFFERED EVENT COMMAND
The Report A Single Buffered Event (RS) command instructs the PDI to report the
first event sample stored in the buffer of the selected channel(s). The Report A
Single Buffer Sample command has the following format:
RSc<cr>
where c = Channel# (1 to 16 or 0 for all).
4.4 EVENT SAMPLE REPORTING
An event is defined as a change-in-state of an input channel and return to the
original state. An event may be started on a rising edge (LO to HI) or a falling
edge (HI to LO) as determined by the Latch Polarity (see Section 5.1.3). On the
PDI-1 switch closure module, an input is considered to be at a "HI" or "1" state
when it is closed (continuity) and a "LO" or "0" state when it is open (infinite
resistance). On the PDI-2A and PDI-2B optically isolated modules, an input is
considered to be at a "HI" or "1" state when there is voltage detected and a "LO" or
"0" state whenever there is no voltage detected. An event sample is the actual data
associated with an event which is calculated by the PDI module and sent to the
host computer/controller. The way an event sample is presented to the host
computer/controller is described in Section 4.5.
PDI event sample reporting depends on the Reporting Method used. When using
Immediate Reporting Method, the PDI will report an event sample whenever an
event occurs. When using Schedule Reporting Method, the PDI will report an
event sample whenever a event occurs after the Report Start Time has elapsed
(see Section 4.2.2.2). When using Command Reporting Method, the PDI will
report an event sample or multiple samples on command only.