Data Acquisition/Central Data Logging
E-2 Verbatim Owner's Manual
l 4 = Sets return-to-normal mode to mode 1 - makes return to
normal calls only in voice mode (NO data calls to the SCADA
Central Computer or Central Data Logger Printer. Entering this
parameter does not affect the RTN ON/OFF state.
l 5 = Sets return-to-normal mode to mode 2 - makes both data and
voice calls upon return to normal. Entering this parameter does
not affect the RTN ON/OFF state.
E.2 Quick Intercall Delay & SCADA Units
Connected to Cellular Phones
This section discusses two different but sometimes interrelating topics
regarding SCADA configured autodialer/RTU units. One topic is the different
ways in which the intercall delay operates in SCADA units. The other is the
ability to interface SCADA units over cellular phones.
Units configured for SCADA operation may place and receive calls via cellular
telephones instead of standard dial-up telephone lines. If purchased from
RACO, the combination of autodialer/RTU, dial-up adaptor and cellular
transceiver is called the CELLULARM
tm
package.
CELLULARM
tm
autodialers/RTUs may be used in cases where land lines are
not available but cellular service is available in a particular area.
CELLULARM
tm
units function nearly identically to land line based dial-up
interfaced units.
v Exceptions
The intercall delay (time between calls) functions somewhat differently on
SCADA units than on non-SCADA units. On SCADA units a shortened
intercall delay takes effect under certain circumstances. These circumstances
are:
1) There is a fixed, non-adjustable intercall delay of 35 seconds between:
a) multiple attempts at data calls to the SCADA Central Computer.
b) the last personnel (voice) number and "wrapping around" to the data
number again.
2) The is also a special adjustable quick intercall delay taken only between the
progression from data calls to the first personnel (voice) call.
The quick intercall delay is set to 35 seconds by default. The usual intercall
delay taken between between one personnel number and the next personnel
number is 2.0 minutes by default.
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