Date Code 20010518 Commands 5-1
SEL-2020 Instruction Manual
SECTION 5: COMMANDS
INTRODUCTION
You control, monitor, operate, and set the SEL-2020 with the command set described in this
section. This section also includes the rules governing the use of these commands. A list
summarizing the commands appears at the end of this section and on a blue pull-out card at the
back of the book.
COMMAND OPERATION
Command/response protocol refers to the command structure and syntax that you must use to
communicate with the SEL-2020. Access levels determine the levels at which you can interrogate
the SEL-2020. Higher levels of access are required to set and operate the device.
Command/Response Protocol
The built-in SEL-2020 command set operates according to the following command/response
protocol:
• All commands accepted by the SEL-2020 are of the form:
<command><CR> or <command><CR><LF>
• The SEL-2020 recognizes both full commands or commands abbreviated to the first
three characters: SHOWSET 1 equals SHO 1.
• You may use upper and lower case characters without distinction, except in passwords.
• Arguments are separated from commands by spaces, commas, semicolons, colons, or
slashes.
Note: The ENTER key on most keyboards is configured to send the ASCII character 13 (^M)
for a carriage return. This manual instructs you to press the <ENTER> key after
commands, which should send the proper ASCII code to the SEL-2020.
• The SEL-2020 transmits all noninteractive messages in the following format:
<STX><MESSAGE LINE 1><CR><LF>
<MESSAGE LINE 2><CR><LF>
.
.
.
<LAST MESSAGE LINE><CR><LF>
Each message begins with the start-of-transmission character STX (ASCII character 02) and
ends with the end-of-transmission character ETX (ASCII character 03). Each line of the
message ends with a carriage return and line feed.
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