8-6 Message Strings Date Code 20010518
SEL-2020 Instruction Manual
MESG3=“\IATDT15093321890/\T5/\DAC7/” Initiate a phone call by issuing
embedded dial string and waiting for
connect indication from modem, wait 5
seconds after connection, output
unsolicited message data from Port 7,
and clear Port 7’s unsolicited message
buffer. The phone call will be placed,
even if there is no data to send (the
unsolicited message buffer is empty).
The connection will be dropped once
the transfer is complete.
MESG4=“\CSC/\002\RH;12:USER:0;100/\003\ Output <STX> followed by Port 12
CE/,\COah/\n” User Region data and <ETX>, followed
by comma and CRC-16 checksum
displayed in ASCII hexadecimal format
and then <CR><LF>. The \CSc/ and
\CE/ strings indicate that the CRC-16
checksum is calculated on all of the data
output from the <STX> through the
<ETX>.
Parsing Sequences
You use the SET U command to create basic and complex user-defined message strings that the
SEL-2020 will recognize. Basic user-defined commands have a fixed character sequence. The
SEL-2020 will recognize a basic message from an attached device only if that message matches
the user-defined message character sequence exactly, in both form and content.
For more advanced applications, you can use parsing sequence characters to develop a user-
defined message that permits the message sent from the attached device to vary in content,
provided it matches the message format exactly. You can also use parsing sequences to construct
a single user-defined message string. This string format can recognize messages having a
partially fixed character sequence with a “wildcard” format. Refer to Table 8.3 for parsing
sequence characters you can use with the SEL-2020.
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