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18.0 AUTOMATIC CALL OUT USING AN EXTERNAL MODEM
18.1 The DE-2500 controller system can perform an automatic call out upon a fault condition.
When a fault occurs, the DE-2500 controller system will dial up to four preprogrammed phone
numbers stored in an external modem, negotiate communications and send the first fault data
log report message (the 999 command) to the Altronic monitor program on a PC or to a
customer supplied device.
18.2 An external modem of 9600 baud or greater along with a null modem cable or adapter
connected to the RS-232 port on the controller is used for remote modem communications.
Please see the Altronic drawing WIRING DIAGRAM - EXTERNAL MODEM in the
programming instructions form DE PI and the modems user’s guide for more information on
installing the modem.
18.3 The modem must first be configured using the monitor program to the following configuration:
Note: The related modem configuration commands are shown in parenthesis. The
commands not listed are set to factory defaults. Modem profile 0 (zero) is used by the
controller system. Up to four phone numbers can be programmed in the modem.
9600 baud only (S37=9)
8 data bits
1 stop bit
no parity
DTR is always on (&D0)
Local Echo off (E0)
Display verbal result codes (V1)
Auto answer on the first ring (S00=1)
Set inactivity timer to one minute (S19=1)
Store the current configuration as profile 0 in nonvolatile memory (&W0)
Use modem profile 0 (&Y0)
store up to four telephone numbers in nonvolatile memory (&Zn=x)
n is the memory location
x is the phone number to be stored
For more information on configuring the modem, please see the programming instructions.
Please refer to the modem’s user guide and reference manual.
18.4 Upon a fault, the controller sends the dial string to dial the first stored phone number in the
modem (ATDTS0). If communications are established, the first fault data log report message
is sent. After the first fault message is sent, a pause of about ten seconds occurs allowing
for time to request other data logs. After ten seconds of no activity, the controller causes the
modem to go offline. The first fault data log is then available on the remote PC for customer
use. If more than one phone number is programmed in the modem, the controller will attempt
to dial each number until all numbers have been successfully negotiated. If the first stored
phone number in the modem is not available, the controller will immediately dial the second
stored phone number. After attempting to dial all of the programmed phone numbers and if
any of them were not answered, a pause of 10 minutes will occur.
After the 10 minute wait period for the line to clear, the controller will send the dial string for
the unanswered stored phone numbers. This sequence will occur twenty times or until it gets
a connect signal for each programmed phone number. If all faults are cleared by initiating
a reset, the controller will cease dialing out.
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