Data Acquisition/Central Data Logging
Verbatim Owner's Manual E-5
E.6 Number of Data Call Attempts Before
Tripping a Communications Alarm
The autodialer can make multiple attempts to communicate in data mode to the
SCADA Central Computer or to the Central Data Logger (CDL) printer. When
all attempts to establish data communications have failed a Communications
Failure Alarm will be tripped. If the unit is able to make voice calls (i.e. more
than just the 1st phone number programmed) the Communications Alarm will
be announced to personnel along with the usual alarm and status report
messages. When a calling sequence is ended, for example by alarms getting
acknowledged, the Communications Alarm is cleared.
If the Communications Alarm persists and successful data communications to
the SCADA Computer or CDL printer is eventually established a
Communications Alarm message will be logged and/or printed. After a
Communications Alarm is logged and/or printed it will be cleared.
u To set the number of attempts before tripping a Communications Failure
Alarm, press:
985 N
Where N is 1 to 10
Default is 3
! Note:
If Automatic Speed Select is set ON the unit will actually make twice the
programmed number of attempts before tripping a Communications Alarm; N
attempts at 1200 baud and N attempts at 300 baud.
E.7 Answer Mode - VOICE ONLY or
DATA-TO-VOICE
Most calls made to an autodialer/RTU will be polling calls from the SCADA
Central Computer. By default the autodialer/RTU will be expecting a data call
and answer with a modem answer tone. This is called DATA-to-VOICE
answer mode. Personnel wishing to call an autodialer/RTU to get voice reports
can just wait through the modem answer tone for a few seconds for the unit to
fall back to voice mode and begin speaking.
The autodialer/RTU may also be programmed for VOICE ONLY answer mode.
In VOICE ONLY mode the unit will never answer with a modem answer tone
and voice annunciation will begin immediately upon answering.
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