User's Manual

Date Code 20091009 SEL-3031 Instruction Manual
Job Done Examples
Using an SEL Information Processor to Collect Relay Status and Measurements
3.7
SEL-3031 Settings
The SEL-3031 requires very few inputs for setting up the serial port to the correct
protocol. Figure 3.8 shows the settings needed for Port 1.
Figure 3.8 SEL-3031 Port 1 Settings for Fast Messaging
The PROTO setting must be set to Standard. The Standard setting is the default for
use on any byte-oriented protocol. The Standard setting is used with connections such
as DNP3, SEL ASCII, Compressed ASCII, Fast Operate, Fast SER, and SEL Fast
Meter with Configuration.
The CTS1 setting should be set to Deasserted. This will deassert the control lines on
the SEL-3031. Some protocols in devices require the control line to be in a high or low
state to permit proper communication. For example, with DNP, some remote devices
will not reply back to the master until the control line is deasserted. If the control line is
asserted the DNP device is told to wait. Again, this setting is based upon how the
vendor implemented flow control in the devices. For most all SEL products this setting
should always be set to Deasserted.
On Port 1 on each radio install an SEL-C285 cable to the IED device. As an alternative,
the SEL-3031 can be ordered with a fiber-optic serial port that works with the
SEL-2812 transceivers. If you use the fiber port on the SEL-3031 connection at the
IED needs to be an SEL-2812MR transceiver or compatible built-in port.