8-2 Message Strings Date Code 20010518
SEL-2020 Instruction Manual
The following are examples of simple strings:
“Another device” A literal string for “Another device”
“TRIG\nY\n” String for TRIG<ENTER>Y<ENTER>
“\002HI\\BOB\003” String for <STX>HI\BOB<ETX>
You can use the quote character to define the beginning and end of a string. If you don’t, the
SEL-2020 will put the string in quotes anyway. The only exception is for pre-defined strings
discussed later in this section.
Table 8.1: Special Characters for Use in Strings
Character Comments
\” The SEL-2020 interprets this as a quote character in a string, as
distinguished from quotes at the beginning and end of a string.
\\ The SEL-2020 interprets this as a backslash character in a string.
\n ENTER sequence (CR/LF combination, just CR on SEL IED ports).
\0xx
The SEL-2020 interprets this as an 8-bit character, where
xx = an ASCII character value in hexadecimal; (e.g., \004 is ASCII End-
of-Text, EOT, character). See Appendix D: ASCII Reference Table
for conversion table.
\ <ENTER> Use to continue a string to the next line.
SPECIAL SEQUENCES
The SEL-2020 is pre-programmed to interpret special sequences of characters for special pur-
poses. You can use these special character sequences in auto-messages or user-defined
commands to control the data that are referenced by the message and to control the response
initiated by the message. These special sequences are particularly well suited for use with non-
SEL IEDs and devices.
Message Sequences
You may use the special character sequences listed in Table 8.2 in automatic messages,
configured with SET A, and special-purpose user-defined command responses, configured with
SET U.
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