5-2 Commands Date Code 20010518
SEL-2020 Instruction Manual
• The CAN character (ASCII character 24) aborts a pending transmission. This capability
is useful in terminating an unwanted transmission.
• You can send control characters from most keyboards with the following keystrokes:
XON: <CTRL-Q> (hold down the Control key and press Q)
XOFF: <CTRL-S> (hold down the Control key and press S)
CAN: <CTRL-X> (hold down the Control key and press X)
Command Access Levels
A multilevel password system with three access levels provides security against unauthorized
access. This system allows you to give personnel access only to those functions they require.
The password system is disabled when the password jumper is inserted on the main board of the
SEL-2020. (See Section 3: Installation for information on using this jumper.)
Each level has an associated screen prompt that indicates the active level. Table 5.1 shows the
access levels of the prompts as well as the commands available from each access level.
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