6-14 Settings Date Code 20010518
SEL-2020 Instruction Manual
Another thing to consider when using modems is how you will terminate the connection. If you
simply hang up, the SEL-2020 will be left in whatever state you were in. This could be a state
which you cannot call back into. To avoid this, you should do two things.
When a modem is on a master port, always exit transparent connections and issue the QUIT
command to terminate the connection. This way, you will always leave the SEL-2020 in a
known state. Secondly, set the port TIMEOUT setting to something other than 0. If you do leave
the SEL-2020 in a bad state, it will go back to a basic Access Level 0 state after the TIMEOUT
time, as if a QUIT command had been issued.
SET A - AUTOMATIC MESSAGE SETTINGS
Use the SET A command to set the SEL-2020 to:
• Automatically buffer unsolicited messages the SEL-2020 receives.
• Automatically print those unsolicited messages, and clear the buffer after printing if you
desire.
• Automatically issue operate messages based on operatic elements.
• Define startup strings for connected devices so the SEL-2020 can automatically
communicate with those devices.
• Create messages to send to other devices and define conditions that trigger those
messages (messages are commands, data, or both).
• Define data parsing methods you want used on responses received.
• Define conditions where data are archived in optional nonvolatile memory.
You can create up to 12 automatic messages per port with the standard SEL-2020 configuration.
Eight of these message functions have an associated data area to store responses, and the other
four are for messages only. Three additional message functions are available with the
nonvolatile Flash memory option, for a total of 15 possible message functions per port.
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