8-10 Message Strings Date Code 20010518
SEL-2020 Instruction Manual
summary event reports, the SEL-2020 collects the third event report. After the SEL-2020 finishes
collecting this event report, the modem initiates a phone call and uploads the event report. Every
5 minutes, the SEL-2020 retriggers the 1:CMD1 causing the next event report to be collected and
transferred via modem, until all three event reports have been collected and transferred.
If the modem port is unsuccessful at initiating a phone call when the next 1:CMD1 trigger
occurs, the !8:D1 term in the event report collection trigger equation prevents a new event report
from being read until the event report has been successfully transferred. The 1:CMD1 bit will
continue to retrigger every 5 minutes until all unread event reports are collected.
MODEM DIAL-OUT PROCESS
The SEL-2020 can dial out to a remote PC, terminal, or IED through an attached or internal
modem. This feature is useful to automatically transfer data from the SEL-2020 database to a
remote location or to acquire data from a remote device. With the SET A command, set an
ISSUEn message trigger to define the condition that initiates the dial-out process, and set a
MESGn to define the message content and data.
The ISSUEn trigger condition can be based on time and/or day-of-week, or any logic condition
using global and local elements in the SEL-2020 database collected from attached devices. The
MESGn message string must begin with a \I.../ special string sequence, followed by the data (or
data request) and/or data output strings, \R.../ or \F.../, that define the message to be sent.
The \I special string sequence initiates the dial-out process through the modem using the
provided dial string. For example \IATDT15093321890/ would dial the SEL factory. The
SEL-2020 will wait up to 60 seconds for a carrier signal from the remote modem, which
indicates the call has been completed. If a carrier signal is not detected in 60 seconds, the
SEL-2020 will hang-up and wait 2 minutes before initiating a subsequent dial-out attempt. (Only
two attempts are made before the SEL-2020 gives up on the message.) You must, therefore, set
the remote modem to answer a call in less than 60 seconds. The SEL-2020 data are transferred
when a successful connection is made.
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