12713020-002-2 Revision D – April 2004 SSU-2000 User’s Guide 267
TL1 Command Interface
The communications mode settings for the COMM L (local) port (located on the
Communications module) always default to ASCII mode on startup.
When connecting via Ethernet, a telnet session to port 2000 (decimal) opens in
TL1 mode and remains until the session is terminated. Once connected in TL1
mode, you must log in using the ACT-USER command with a user name and
password (if security is active on the unit).
To close the serial port for TL1 communications, type
EXIT, then press Enter, or
send three ESCape characters from the management terminal. This logs you out
and returns the port to the default communications mode.
To log off the user and exit from an Ethernet connection:
Type EXIT, then press Enter, or disconnect the Telnet session or.
Type CANC-USER, then press Enter to log out and return the port communication
setting to security level 0. This command does not change the communications
mode.
TL1 Command and Response Conventions
This section describes general and specific conventions for expressing TL1
command and response parameters for the four types of operations application
messages:
Input Command Message – This message determines the action that the
SSU-2000 will take. For a detailed description of input command messages and
conventions, see Input Command Message Conventions, on page 268.
In-Process Acknowledgment – The in-process acknowledgment (IP) response
message is sent in response to a command that the SSU-2000 is unable to
respond to within two seconds. For a detailed description of in-process
acknowledgment response messages and conventions, see In-Process
Acknowledgment Response Message Conventions, on page 269.
Output response message – The output response message indicates whether
the command was complied with (COMPLD) or denied (DENY). For a detailed
description of output response messages and conventions, see Output
Response Message Conventions, on page 270.
Autonomous response or report message – The autonomous response or
report message is an output generated by the SSU-200 due to an event, such as
an alarm, or a change in status in the system. For a detailed description of
autonomous response or report messages and conventions, see Autonomous
Report Conventions, on page 272.
Note: The automatic time-out is disabled for the port when you
are communicating in TL1 mode using one of the serial
communications ports or the Ethernet port.
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