7.11
Date Code 20120126 Instruction Manual SEL-2032 Communications Processor
Settings
Automatic Message (SET A) Settings
setting the SEL-2032 to the lowest likely connection rate, typically 2400 baud.
Alternatively, you can enable RTS/CTS or XON/XOFF flow control between
the SEL-2032 and the modem.
To use hardware flow control, set RTS_CTS = Y on the modem port. Only use
this setting if the RTS and CTS control lines are wired between the SEL-2032
and the modem. The modem should default to use hardware flow control.
Alternatively, to use software flow control, set XON_XOFF=Y on the modem
port and modify the MSTR setting to enable XON/XOFF handshaking within
the modem. Refer to your modem data sheet to determine the appropriate code
for your modem.
Many external modems do not behave well if they receive non-modem
messages while they are not connected. For this reason, you should connect
the Data Carrier Detect output of the modem to the SEL-2032 so
transmissions to the modem can be prevented. If you have the modem
connected to Port 1 or 9 of an SEL-2032, you can connect DCD and RTS/CTS
flow control signals to the SEL-2032. If you are connected to any other port of
a SEL-2032, connect the modem DCD output to the CTS input of the
SEL-2032 and set CD_CTS to Yes. Of course, with this connection you will
not be able to use RTS/CTS flow control.
Another thing to consider when using modems is how to terminate the
connection. If you simply hang up, the SEL-2032 is left in whatever state you
were in. This could be a state to which you cannot call back. 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 always leave the SEL-2032 in a
known state.
➤ Set the port TIMEOUT setting to something other than 0. If
you do leave the SEL-2032 in an undesired state, it will return
to a basic Access Level 0 state after the TIMEOUT time, as if a
QUIT command had been issued.
Automatic Message (SET A) Settings
Use the SET A command to set the SEL-2032 to:
➤ Automatically buffer unsolicited messages the SEL-2032
receives.
➤ Automatically print those unsolicited messages, and clear the
buffer after printing if you desire.
➤ Automatically issue operate messages based on operating
elements.
➤ Automatically collect Sequential Events Recorder (SER) data.
➤ Automatically collect synchrophasor data from SEL IEDs.
➤ Define startup strings for connected devices so the SEL-2032
can communicate automatically with those devices.
➤ Create messages to send to other devices and define conditions
that trigger those messages (messages are commands, data, or
both).
Courtesy of NationalSwitchgear.com
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