Schweitzer Engineering SEL-2032 - Section 5: Message Strings; Introduction; Overview; Literal Characters

Date Code 20120126 Instruction Manual SEL-2032 Communications Processor
Section 5
Message Strings
Introduction
This section provides information about the characters, special sequences of
characters, and predefined strings that you can use in a number of SEL-2032
settings. A blue pull-out card at the end of the book contains a summary list of
special characters and predefined strings.
Overview
A string is a sequence of characters that make up part, or all, of a message
command or identifier label. Each character may be an ASCII printable
character or any 8-bit code that represents a nonprintable character. You use
these strings in the following ways:
➤ Device and Port IDs, termination strings, and modem startup
strings in Port configuration using the SET P command.
➤ Startup sequence for an IED and message strings in auto-
messages using the SET A command.
➤ User-defined commands and responses using the SET U
command.
NOTE: You should avoid using LMD
prefix characters in Master port user-
defined commands. For an
explanation of LMD and a list of LMD
prefix characters see Section 9:
Protocols.
Message strings consist of literal characters, special sequences, and
predefined strings. Literal characters include both ASCII printable and
nonprintable characters. Special sequences are strings that are interpreted to
have a special meaning when they are used, such as dial a particular phone
number, or output a specified set of database data. Predefined strings are used
with SEL IEDs to represent certain predefined operations, such as 20METER
means collect meter data in best method available for attached device. The
following sections further describe these types of message sequences.
Literal Characters
Message strings typically contain some literal characters. These consist of
both ASCII printable characters and nonprintable characters. Printable
characters (except ‘\’) are entered into a string by directly entering the
character (depressing the key for that character on your keyboard). You can
also enter any character based on its 8-bit code. To enter a nonprintable
character (or special sequence strings) using printable characters, you must
use a special sequence to indicate that you are entering something other than a
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