Operating logic:Upon
application of power to the unit, communication will be established with
the Enhanced Timer Network. When everything on the network is normal,
all the LED's will be illuminated green and the data from the first
Enhanced Timer on the network will be displayed. If no communication is
established, then the message "NET FAIL" will be displayed and
the "NETWORK STATUS" LED will begin flashing red to indicate a
fault.
Each Enhanced Timer on the
network is programmed with its unique ID number. When the Display is
presenting the data from any Enhanced Timer on the network, this ID
number will be shown as "TIMER xxx" (with xxx being the ID
number) along with the data on the alpha-numeric display. The data from
any Enhanced Timer on the network will be presented sequentially in a
scrolling fashion on the alpha-numeric display, for as long as the
Display is set for that particular timer. Enhanced Timer selection is
accomplished by accessing the "SELECT TIMER" menu item (see
programming tree).
If, during the course of normal
operation, an alarm occurs on an Enhanced Timer other than that which is
being displayed, the Display will automatically switch to the Enhanced
Timer generating the alarm and show the alarm condition along with all
other parameters associated with it. Alarm events are annunciated by the
alpha-numeric display along with a corresponding LED indicator which
will begin flashing red until the alarm condition has been cleared or
until the "ALARM CANCEL" key has been pressed.
An additional feature of the
Display is the normally open Alarm Output Relay which closes on any
alarm condition; this output can be used to switch a signalling device
to alert the user. When an alarm condition is present, pressing the
"ALARM CANCEL" key will cause the Alarm Output Relay to open
but keep the Alarm status in effect on the display and change the
flashing red LED to a steady amber to indicate that the alarm condition
has been acknowledged but has not yet been cleared.
The six button keypad similar to
that found on the Enhanced Timer can be used to program parameters or
generate History Reports of any Enhanced Timer on the network (see
programming tree for overview). Programming data is sent over the two
wire network to the respective Enhanced Timer. History Report data is
sent over the RS-232 port on the Display to a device which is capable of
displaying and/or storing a comma delimited ASCII file format. A typical
application would be to connect a laptop PC computer's RS-232 port to
the Display's RS-232 port with a null modem cable and download a History
Report into a file for later analysis in a spreadsheet type program.
Remote access of the Display functions is also available via the RS-232
port. Using the same connection as stated above, a PC can be used to
display all the data provided by an Enhanced Timer as well as program
any facet of the Enhanced Timer Network.
Among the features of the Display
is a battery backed up Y2K compliant 24 hour Day/Date/Year clock which
maintains the Enhanced Timer Network time for accurate recording of
History logging and all alarm events for all of the Enhanced Timers on
the network. Furthermore, two Alarm Inputs are provided on the Display
for monitoring general system alarms or whatever the user desires.
The DNC-T2300-DSP is designed to
be used as a central point of control for either a small or large
facility which has multiple dust collectors or to monitor a dust
collector from a remote location. Since the two wire network utilizes
"peer to peer" communication protocol, it is possible to have
more than one Display connected to the Enhanced Timer Network to report
the status of different Timers simultaneously.
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File #E65038
